WO1999048280A1 - Lecteur d'images - Google Patents
Lecteur d'images Download PDFInfo
- Publication number
- WO1999048280A1 WO1999048280A1 PCT/JP1999/001286 JP9901286W WO9948280A1 WO 1999048280 A1 WO1999048280 A1 WO 1999048280A1 JP 9901286 W JP9901286 W JP 9901286W WO 9948280 A1 WO9948280 A1 WO 9948280A1
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- color
- reading
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- signal
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/48—Picture signal generators
- H04N1/486—Picture signal generators with separate detectors, each detector being used for one specific colour component
Definitions
- the present invention relates to a color image reading device capable of efficiently performing analog signal processing in image reading, and more particularly to a device capable of performing high-speed processing when reading a monochrome image.
- CCD Color 1 ed Device
- FIG. 17 is an explanatory diagram of a CCD line sensor in a conventional image reading device.
- the CCD line sensor 6 has R, G,
- the analog signal output corresponding to the B color component is divided into even-numbered pixels and odd-numbered pixels in the pixel columns 101a, 101b, and 101c and output. ing.
- FIG. 18 is an explanatory diagram showing a configuration of an optical unit and a mechanism unit in a conventional image reading apparatus.
- the optical section and mechanism section of the image reading device illuminate the original with a transparent platen glass 1 for placing the original, a lamp 2 for illuminating the original, and a lamp 2
- a mirror 4 for guiding the reflected light of the reflected light to the imaging lens 5, an imaging lens 5 for forming an image of the reflected light guided by the mirror 4, and a light imaged by the imaging lens 5.
- the CCD line sensor 6 that photoelectrically converts the data and reads the data as electric charges, and moves in the sub scanning direction including the lamp 2, the mirror 4, the imaging lens 5, and the CCD line sensor 6. It consists of carriage 3 that scans the image reading line.
- FIG. 19 is a configuration diagram of an analog data processing unit in a conventional image reading apparatus.
- the analog data processing section of the image reading device includes a gain correction section 7 for correcting the amplitude of the analog signal output from the CCD line sensor 6, and a DC potential of the analog output signal.
- Offset corrector 8 for performing correction, sample holder 9, multiplexor 10a, 10b, 10c for multiplexing analog signals by time division, A / D for converting analog signals to digital signals (Analog-to-digital) converter 1 1 a- 1 1 c, Selects the data in accordance with the control signal from the input data, and outputs a drop-out color selection unit 12.
- the drop-out color selection section 12 and the evening color are switched according to the monochrome color changeover input and the drop-down color specification when reading the monochrome color. It comprises a read mode control unit 14 that outputs a control signal for controlling the mining generation unit 13.
- FIG. 21 This will be described with reference to a configuration diagram around the multiplex section of the conventional image reading apparatus of FIG. 2) and an explanatory diagram showing the operation of the multiplex section of the conventional image reading apparatus of FIG. 21 (b).
- the reflected light from the original is guided to the imaging lens 5 by the mirror 4, and the light formed by the imaging lens 5 is reflected by the R, G, and B color filters (not shown).
- the light is separated into R, G, and B components, respectively, and is read by the CCD line sensor 6, respectively.
- the CCD line sensor 6 outputs the waveform according to the specification of the reading mode control unit 14 by using the output of the timing generation unit 13. Driven.
- the analog signal output from the CCD line sensor 6 is output from the gain correction unit 7 and offset correction unit 8 to a waveform corresponding to the input width of the AZD conversion units 11a, lib, and 11c. Then, the DC potential is corrected, and only the effective output is held in the sample holding section 9 by the sample holding timing shown in FIG.
- the analog signal output from the sample hold section 9 is converted into the multiplex section 10a to 10c by the logic of the multiplex section an of FIG. 20 and the logic of FIG. 21 (b) in the multiplex sections 10a to 10c.
- R, G, and B are time-division multiplexed into even and odd pixels, respectively.
- Analog signals output from the multiplex sections 10a to 10c are input to the A / D conversion sections 11a to 11c, respectively, converted into digital signals, and then dropped out. Input to selection section 1 2.
- the dropout color selection section 12 In the case of color reading, the dropout color selection section 12 outputs the digital data of each of R, G, and B as they are. Also, in the case of monochrome reading, the drop-out color selection section 12 outputs only the color components specified by the reading mode control section 14.
- R is selected as the dropout color that uses that color component for monochrome reading
- only the R data is output.
- the digital signal output from the drop-out color selection unit 12 is output to the subsequent stage after performing predetermined processing such as line correction and color correction.
- predetermined processing such as line correction and color correction.
- the carriage 3 moves one line in the sub-scanning direction and repeats this operation to scan the entire document. Is performed.
- the data of the dropout color is selected. For example, if R is selected as the dropout color, only the data of R will be output after all the data of R, G, and B have been subjected to AZD conversion.
- the AZD converter that performs AZD conversion on the G and B data is converting unnecessary data.
- monochrome reading is often read faster than color reading, so the conversion speed of the AZD converter is better for monochrome than for color. High speed will be required.
- the A / D converter must perform the conversion at a lower conversion speed during color reading. Must.
- the capability of the A / D converter is wasted, resulting in an increase in cost. There is.
- the present invention provides a method for reading analog signals when the mode for color reading and high-speed monochrome reading are provided.
- An object of the present invention is to provide an image reading device capable of reading an image at high speed and at low cost by selecting a dropout color by using the AZD converter and not deteriorating the performance of the AZD converter. Disclosure of the invention
- the image reading apparatus of the present invention performs time-division multiplexing of analog signals of respective color components output from the sample hold means during color reading into even pixels and odd pixels.
- the even and odd pixels of the analog signal of the selected color component or the luminance signal generated from the analog signal of each color component output from the sample hold means are output.
- Signal conversion means for converting the digital signal into digital data, and when the digital signal converted by the signal conversion means is a color reading, the digital signal Outputs No., in the case of mono-click Rohm read the digital data sequence is divided into the even-numbered pixels and odd-numbered pixels and also to have a sort rearrangement means into a single data stream in sequence.
- FIG. 1 is a configuration diagram of an analog data processing unit in the image reading device according to the first embodiment of the present invention.
- FIG. 2 (a) is a configuration diagram around a selector unit in the image reading device according to the first embodiment of the present invention.
- FIG. 2 (b) is an explanatory diagram showing the operation of the selector section
- FIG. 3 is a timing chart at the time of color reading in the image reading apparatus according to Embodiment 1 of the present invention
- FIG. 4 is an embodiment of the present invention.
- FIG. 5 is a timing chart at the time of monochrome reading in the image reading device according to Example 1
- FIG. 5 is a configuration diagram of an analog data processing unit in the image reading device according to Embodiment 2 of the present invention
- FIG. 6 is a block diagram of the periphery of the selector unit in the image reading apparatus according to the second embodiment of the present invention.
- Fig. 6 (b) is an explanatory diagram showing the operation of the selector unit.
- Fig. 7 (a) is a second embodiment of the present invention. by FIG. 7 (b) is an explanatory diagram showing the operation of the multiplex section of the image reading apparatus, and
- FIG. 8 is a diagram showing the Y conversion provided in the image reading apparatus according to the second embodiment of the present invention.
- FIG. 9 is a timing chart for color reading in the image reading apparatus according to the second embodiment of the present invention.
- FIG. 10 is a timing chart for the image reading apparatus according to the second embodiment of the present invention. Timing chart for monochrome reading, Fig.
- FIG. 12A is a configuration diagram of an analog data processing unit in an image reading device according to Embodiment 3 of the present invention.
- FIG. 12A is a configuration diagram around a 4-input selector unit provided in the image reading device according to Embodiment 3 of the present invention.
- FIG. 12 (b) is an explanatory diagram showing the operation of the four-input selector unit.
- FIG. 13 is a circuit diagram of an I-converter provided in the image reading apparatus according to the third embodiment of the present invention.
- FIG. 4 is a circuit diagram of a Q conversion unit provided in the image reading device according to the third embodiment of the present invention.
- FIG. 15 is a timing chart at the time of color reading in the image reading device according to the third embodiment of the present invention.
- FIG. 16 is a timing chart for monochrome reading in the image reading device according to the third embodiment of the present invention.
- Fig. 17 is a schematic diagram of a CCD line sensor in the conventional image reading device.
- Figure 18 shows the FIG. 19 is a schematic diagram showing a configuration of an optical unit and a mechanism unit in the image reading apparatus of FIG. 19,
- FIG. 19 is a configuration diagram of an analog data processing unit in the conventional image reading apparatus, and FIG. Color data and monochrome data—timing chart during evening processing
- Fig. 21 (a) shows the configuration around the multiplex section of a conventional image reading device
- Fig. 21 (b) shows the conventional image reading.
- FIG. 4 is an explanatory diagram showing an operation of a multiplex unit of the device.
- FIGS. 1 to 16 members having the same function are denoted by the same reference numerals, and duplicate description is omitted.
- FIG. 1 is a configuration diagram of an analog data processing unit in the image reading device according to the first embodiment of the present invention
- FIG. 2 (a) is a configuration around a selector unit in the image reading and taking device according to the first embodiment of the present invention
- Fig. 2 (b) is an explanatory diagram showing the operation of the selector section
- Fig. 3 is a timing chart for color reading in the image reading apparatus according to the first embodiment of the present invention
- Fig. 4 is the same image. This is a timing chart when a monochrome is read by the reading device.
- the analog data processing unit of the image reading device includes a gain correction unit 7 for correcting the amplitude of the analog signal output from the CCD line sensor 6, an analog output signal Offset corrector 8, gain corrector 7, sample hold 9 that holds only the effective output of the signal corrected by offset corrector 8, time-division multiplexing of analog signals Or 1 Selector for selecting and outputting the output (selection means) 15a to 15c, AZD converter for converting analog signals to digital signals (signal converter) 1 la to: lie, A / D conversion unit 11 aa-: rearrangement unit 16 that rearranges digital data output from Lie, CCD line sensor 6, sample hold unit 9, selector unit according to output control signal 1 5a ⁇ l 5 c and AZD converter 1 1 a Timing generator 13 that outputs timing to drive 1c to 13c, Carano monochrome reading cut-off input from CPU (not shown) or operation panel (not shown), etc. It consists of a read mode control unit 14 that controls the
- the configuration of the CCD line sensor and the configurations of the optical unit and the mechanism unit of the image reading apparatus in this embodiment are substantially the same as those in FIGS. 17 and 18 which explain the conventional technology. Therefore, the description is omitted.
- the original placed on the platen glass 1 is irradiated with light from the lamp 2.
- the reflected light from the original is guided to the imaging lens 5 by the mirror 4, and the light formed by the imaging lens 5 is converted to R, G, B by the R, G, B color filters (not shown).
- Each of the light beams is separated and read by the CCD line sensor 6.
- the CCD line sensor 6 is driven by the CCD transfer clock output of the timing generator 13 which outputs a waveform corresponding to the output of the read mode controller 14 in FIG. .
- the analog signal output from the CCD line sensor 6 is input to the gain correction section 7 and offset correction section 8 by the A / D conversion section.
- the amplitude and DC potential are corrected to 11 waveforms, and only the valid output is held by the sample hold unit 9.
- Figure 3 shows the timing chart for color reading.
- the even pixel output signal and the odd pixel output signal of the R, G, and B CCDs were sample-holded at the sample-hold timing, respectively, and output from the sample-hold unit 9.
- the analog signals are selected by the logic of FIG. 2 (b) in the selectors 15a to 15c based on the waveforms of the respective parts of FIG. Pixels and odd-numbered pixels are time-division multiplexed.
- the multiplexed analog signals output from the selectors 15a to 15c are input to the AZD converters 11a to 11c, respectively, and are synchronized with the A / D converter clock.
- the signal is converted into a digital signal and input to the rearranging section 16.
- the outputs of the AZD converters 11a to l1c are R, G, and B components, respectively, which are arranged in pixel order, so the rearranging unit 16 outputs the digital data as it is. I do.
- the output from the rearranging unit 16 is output to a subsequent stage after predetermined processing such as line correction and color correction is performed.
- Fig. 4 shows the timing chart when reading a monochrome image. This example shows a case where R is selected as the dropout color.
- the analog signal output from the sample hold section 9 is applied to the selector section 15a according to the waveform shown in FIG. A row (R even) is selected, and an odd pixel row (R odd) of R is selected and output in the selector section 15b.
- the output of the selector 15c is not used as image data, arbitrary data may be output or may not be output.
- the output of the selector 15a is input to the AZD converter 11a, and the output of the selector 15 is input to the 80 converter 11b and converted into digital signals. That is, the AD conversion unit 11a performs conversion of only even-numbered pixels of R, and the AZD conversion unit lib performs conversion of only odd-numbered pixels of R.
- the digital data output from the AZD conversion units lla and lib are input to the rearranging unit 16, and the rearranging unit 16 sequentially sorts the data string that is separated into even-numbered pixels and odd-numbered pixels into 1 Combined into two data strings and output.
- the output from the reordering unit 16 is output to the subsequent stage after performing predetermined processing such as line correction.
- the carriage 3 moves one line in the sub-scanning direction. The entire document is scanned by moving and repeating this operation.
- the accumulation time of one line during color reading is 19.8 msec, and that the number of pixels per line is 496 pixels.
- the CCD line sensor outputs the R, G, and B components separately for even and odd pixels, the period of the pixel output per output is 8 sec.
- the pixel output cycle of the selector sections 15a, 15b, and 15c is a time-division multiplex of even and odd pixels. Is 4 ⁇ sec.
- the conversion speed required for the A / D conversion units 11a, lib, and 11c is 250 ksps (Kilo Sampling Per Second).
- the accumulation time of one line is 8.2 msec and one output of CCD line sensor 6
- the per pixel output period is 4 sec.
- the outputs of the selectors 15a to 15c are output at the same cycle as the output cycle of the CCD line sensor 6, so that the pixel output cycle is 4 Hsec.
- the conversion speed required for the A / D converters 11 a to l 1 c is 250 ksps, which is the same as that for color reading.
- the even and odd pixel rows of R which is the dropout color, are shared by the selector sections 15a and 15b.
- the reordering unit 16 shares the A / D-converted pixel columns by sharing them with the AZD conversion units 11a and 11b into one data column.
- the AZD conversion speed can be kept low even in an image reading device having a high-speed monochrome reading mode.
- the AZD conversion of the monochrome reading can be performed at a speed equal to the AZD conversion speed required for the color reading.
- FIG. 5 is a configuration diagram of an analog data processing unit in the image reading device according to the second embodiment of the present invention.
- FIG. 6 (a) is a configuration diagram around a selector unit in the image reading device according to the second embodiment of the present invention.
- FIG. 6 (b) is an explanatory diagram showing the operation of the selector unit
- FIG. 7 (a) is a diagram of the image reading device according to the second embodiment of the present invention.
- FIG. 7 (b) is an explanatory diagram showing the operation of the multiplex section
- FIG. 8 is a circuit diagram of a Y conversion section provided in the image reading apparatus according to the second embodiment of the present invention.
- Fig. 9 is an evening chart for color reading in the image reading apparatus
- Fig. 10 is a timing chart for monochrome reading in the image reading apparatus.
- the analog data processing section of the image reading apparatus includes a gain correction section 7, an offset correction section 8, a sample hold section 9, and an 8/0 conversion section.
- analog output signal can be selected by time division multiplex or 1 output Selector section (selection means) 18a, 18b (detailed in Fig. 6), multiplex section (selection means) 19, R, G for time-division multiplexing and outputting analog input signals
- It is composed of Y converters (brightness converters) 17a and 17b for converting B data to luminance (Y) data.
- each of the Y conversion sections 17a and 17b is composed of a constant number of amplifiers 104a to 104c and an operational amplifier 105.
- the configuration of the CCD line sensor and the configuration of the optical unit and the mechanism unit of the image reading device in this embodiment are substantially the same as those shown in FIGS. 17 and 18 which explain the conventional technology. Therefore, the description is omitted.
- the analog signal output from the original read by the CCD line sensor 6 is output from the gain correction unit 7 and the offset correction unit 8 in the input width of the AZD conversion units 11a to l1c.
- the process is the same as that of the first embodiment until the amplitude and the DC potential are corrected to the obtained waveform and only the valid output is held in the sample holding unit 9.
- the even pixel output signal and the odd pixel output signal of each of the R, G, and B CCDs are sample-holded by the sample hold timing shown in Fig. 9, respectively.
- the output analog signals are supplied to the selector sections 18a, 18 and the multiplex section 19 for the R, G, and B, respectively, according to the waveforms of the respective sections in FIG.
- Even pixels and odd pixels are selected by the logic shown in FIG. 7 (b) and time-division multiplexed, but inputs from the Y converters 17a and 17b are not selected.
- Analog signals obtained by time-division multiplexing of even-numbered pixels and odd-numbered pixels output from the selector sections 18a and 18b and the multiplex section 19 are input to the AZD conversion sections 11a to 11 respectively. After being converted into a digital signal, it is input to the rearranging section 16.
- the outputs of the AZD converters lla to 11c have R, G, and B components arranged in pixel order, respectively. Therefore, the rearranging section 16 outputs the digital data as it is.
- the output of the reordering unit 16 is output to the subsequent stage after predetermined processing such as line correction and color correction is performed.
- the even-numbered pixel output signal and the odd-numbered pixel output signal of the R, G, and B CCDs are sample-holded at the sample-hold timing shown in Fig. 10, respectively.
- the analog signal output from the section 9 even-numbered pixel rows of R, G, and B are input to the Y conversion section 17a, and odd-numbered pixel rows are input to the Y conversion section 17b.
- the R, G, and B analog signals input to the Y converters 17a and 17b are amplified at a predetermined gain, added, converted to a Y signal, and output.
- the analog signals output from the Y conversion sections 17a and 17b are converted by the selector section 18a according to the waveform of FIG. 10 into the even-numbered pixel column of Y in the logic of FIG. 6 (b). Is selected, and the odd pixel column of Y is selected and output in the selector section 18b.
- the output of the multiplex unit 19 since the output of the multiplex unit 19 is not used as image data, arbitrary data may be output or may not be output.
- the output of the selector 18a is output to the AZD converter 11a, and the output of the selector 18b is input to the AZD converter 11b and converted into a digital signal.
- the AZD converter 11a performs conversion of only the even pixels of Y
- the AZD converter lib converts only the odd pixels of Y.
- the digital signal may be output by performing A / D conversion, or the A / D conversion may not be performed.
- the digital data output from the AZD conversion units lla and lib are input to the rearrangement unit 16 and the data columns separated into even-numbered pixels and odd-numbered pixels are combined into one data column in order. Output.
- the data string output from the reordering unit 16 is output to a subsequent stage after a predetermined process is performed.
- the carriage 3 moves one line in the sub-scanning direction and repeats this operation to scan the entire document. I do.
- the accumulation time of one line during color reading is 19.8 msec, and the number of pixels per line is 496 pixels. Since the CCD line sensor used in this case outputs the R, G, and B components separately for even and odd pixels, the pixel output period per output is 8 sec.
- the pixel output cycle per one output of the CCD line sensor 6 is 8 sec
- the pixel output cycle of the selector sections 18a and 18b and the multiplex section 19 is such that even-numbered pixels and odd-numbered pixels are time-division multiplexed. Is 4 ⁇ sec. That is, the A / D converter 1 T / 0
- the conversion speed required for 19 l a, l i b, 11 c is 250 ksps.
- the accumulation time of one line is 8.2 msec, and one output of CCD line sensor 6
- the per pixel output period is 4 sec.
- the outputs of the selector sections 18a, 18b, and 18c are output at the same cycle as the output cycle of the CCD line sensor 6, the pixel output cycle is 4 sec.
- the conversion speed required for the AZD conversion units lla, 1lb, and l1c is 250 ksps, which is the same as in color reading.
- the Y converters 17a and 17b convert the R, G, and B signals with the analog signals. Since it is converted to a Y signal, it is possible to perform A / D conversion for monochrome reading at a speed equal to the AZD conversion speed required for color reading without generating dropout color. it can.
- FIG. 11 is a configuration diagram of an analog data processing unit in the image reading device according to the third embodiment of the present invention.
- FIG. 12 (a) is a diagram illustrating a configuration of the image reading device according to the third embodiment of the present invention.
- FIG. 12 (b) is an explanatory diagram showing the operation of the four-input selector part, and
- FIG. 13 is provided in the image reading apparatus according to the third embodiment of the present invention.
- Circuit diagram of I-converter The figure shows the circuit diagram of the Q conversion section provided in the image reading device.
- Fig. 15 shows the evening chart for color reading in the image reading device.
- Fig. 16 shows the same image. This is a timing chart when a monochrome reading is performed by the reading device.
- the analog data processing section of the image reading apparatus includes a gain correction section 7, an offset correction section 8, a sample hold section 9, and an AZD
- 18a and 18b Fig.
- I converter first color converter
- I color converter
- Q color converter
- the I conversion section 20 is composed of constant-multiplier amplifiers 106a to 106c and an operational amplifier 107.
- the conversion section 21 is composed of a constant number of amplifiers 108a to 108c and an operational amplifier 109.
- the analog signal that is read and output by the CCD line sensor 6 is output by the gain correction unit 7 and offset correction unit 8, and the input width of the A / D conversion unit 11a to l1c.
- the process is the same as in the first and second embodiments until the amplitude and the DC potential are corrected to the waveform corresponding to the above, and only the effective output is held in the sample hold unit 9.
- the even pixel output signal and the odd pixel output signal of each of the R, G, and B CCDs are sample-holded by the sample hold timing shown in Fig. 15 respectively, and the sample hold unit 9
- the analog signals output are time-division multiplexed by the even and odd pixels for each of 1 and G in the selector sections 18a and 1813 in the same manner as in the second embodiment.
- even-numbered pixels and odd-numbered pixels of B are time-division multiplexed according to the waveforms in FIG. 15 and the logic in FIG. 12 (b).
- the outputs a, 17b, 20 and 21 are not selected.
- the analog signals of the multiplexed even and odd pixels output from the selector sections 18a and 18b, and the 4-input selector section 22 are sent to the AD conversion sections 11a and lib11c, respectively. After being input and converted into a digital signal, it is input to the rearranging section 16.
- the outputs of the A / D converters lla to 11c are arranged in the pixel order of the R, G, and B components, respectively, so that the rearrangement section 16 outputs the digital data as it is.
- the output from the rearranging section 16 is output to the subsequent stage after predetermined processing such as line correction and color correction is performed.
- the even-numbered pixel output signal and the odd-numbered pixel output signal of the R, G, and B CCDs are sample-holded by the sample-hold timing shown in Fig. 16 respectively, and the sample-hold section 9
- the even-numbered pixel rows of R, G, and B in the output analog signal are input to Y-converting section 17a, I-converting section 20 and Q-converting section 21, and the odd-numbered pixel rows are input to Y-converting section 17b. It is.
- the R, G, and B analog signals input to the Y converters 17a and 17b are amplified by predetermined gains, respectively, added, converted to Y signals, and output. .
- the R, G, and B analog signals input to the I conversion section 20 and the Q conversion section 21 are amplified at a predetermined gain and then added to the I signal and the Q signal, respectively. Converted and output.
- the Y signals output from the Y converters 17a and 17b an even pixel column of Y is selected in a selector 18a, and an odd pixel column of Y is selected in a selector 18b.
- the I signal output from the I conversion unit 20 and the Q signal output from the Q conversion unit 21 The signals are time-division multiplexed as 10, Q 2, 14, and Q 6-'by the 4-input selector unit 22 according to the waveform in Fig. 16 and the logic in Fig. 12 (b), and output. Is done.
- the outputs of the selectors 18a, 18b and the four-input selector 22 are input to A / D converters 11a to 11c, respectively, and converted into digital signals.
- the AZD converter 11a converts only the even pixels of the Y signal
- the AZD converter lib converts only the odd pixels of the Y signal
- the A / D converter 11c performs time division multiplexing. Performs conversion between I and Q signals.
- the digital data output from the A / D conversion unit 11a, lib, 11c is input to the rearrangement unit 16 and the Y data string divided into even-numbered pixels and odd-numbered pixels in order.
- the data is combined into one data string, and the time-division multiplexed I and Q signals are divided into their respective data strings and output.
- the data sequence output from the rearranging unit 16 is output to the subsequent stage after a predetermined process is performed.
- the carriage 3 moves one line in the sub-scanning direction and repeats this operation to scan the entire document. .
- the CCD line sensor 6 outputs each of the R, G, and B components into even-numbered pixels and odd-numbered pixels, and the period of pixel output per output is 8 sec.
- the pixel output cycle per output of the CCD line sensor 6 is 8 sec
- the pixel output cycle of the selector sections 18a and 18b and the 4-input selector section 22 is 4 sec.
- the conversion speed required for the octane 0 conversion units 11 &, llb, and 11c is 250 ksps.
- the accumulation time for one line is 8.2 msec
- one output of CCD line sensor 6 The pixel output cycle is 4 zsec.
- the outputs of the selectors 18a and 18b and the four-input selector 22 are output at the same cycle as the output cycle of the CCD line sensor 6, so that the pixel output cycle is 4 sec.
- the conversion speed required for the A / D converters 11a, llb, and 11c is 250 ksps, which is the same as that for full color reading.
- the R, G, and B signals can be converted into analog signals by the Y converters 17a, 17a. Since b is converted to a Y signal, AZD conversion for monochrome reading can be performed at the same speed as the A / D conversion speed required for color reading without generating dropout color. .
- the rearrangement unit 16 rearranges the time-division multiplexed I and Q signals converted by the I conversion unit 20 and the Q conversion unit 21 into respective data columns and outputs them. It can be used as a simple color mode.
- the AZD conversion unit performs AZD conversion, and the sorting means time-division multiplexes the A / D-converted pixel strings into one data string, so that monochrome reading is easier than when reading one color. Even if the time is fast, the AZD conversion speed can be kept low, for example, even if the monochrome reading is twice as fast as the color reading, it is equal to the A / D conversion speed required for color reading An effective effect of being able to perform A-to-D conversion for monochrome reading at a high speed is obtained.
- each color component in the analog signal is converted into a luminance signal by the luminance conversion unit, and after the selection of the even pixel and the odd pixel by the selection unit,
- the AZD conversion is performed by individual A / D conversion units, and the sorting means converts those A / D-converted pixel rows into one data row. Since time-division multiplexing is performed, the AZD conversion speed is kept low even when reading monochrome images faster than when reading monochrome images, without generating dropout colors. For example, even if monochrome reading is twice as fast as color reading, AZD conversion for monochrome reading must be performed at a speed equal to the AZD conversion speed required for color reading. An effective effect is obtained.
- each color component of the analog signal is divided into even-numbered pixels and odd-numbered pixels, and is converted into a luminance signal by a luminance conversion unit, and is selected.
- AZD conversion is performed by separate AZD converters, and the first and second color converters convert the first and second color signals respectively.
- the conversion means performs the time division multiplexing of the luminance signals of the even-numbered pixels and the odd numbered pixels. Since the data is rearranged into a data string and output, the first color signal and the second color signal can be used as a simple color mode without causing a dropout color.
- the A / D conversion speed can be kept low.
- the monochrome reading is performed at a speed equal to the AZD conversion speed required for color reading This has an effective effect that A / D conversion can be performed.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9927330A GB2342000B (en) | 1998-03-19 | 1999-03-16 | Image reading apparatus |
US09/424,188 US6717617B1 (en) | 1998-03-19 | 1999-03-16 | Image reader |
DE19980667T DE19980667T1 (de) | 1998-03-19 | 1999-03-16 | Bildlesevorrichtung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10070156A JPH11275371A (ja) | 1998-03-19 | 1998-03-19 | 画像読み取り装置 |
JP10/70156 | 1998-03-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999048280A1 true WO1999048280A1 (fr) | 1999-09-23 |
Family
ID=13423437
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/001286 WO1999048280A1 (fr) | 1998-03-19 | 1999-03-16 | Lecteur d'images |
Country Status (6)
Country | Link |
---|---|
US (1) | US6717617B1 (ja) |
JP (1) | JPH11275371A (ja) |
DE (1) | DE19980667T1 (ja) |
GB (1) | GB2342000B (ja) |
TW (1) | TW411691B (ja) |
WO (1) | WO1999048280A1 (ja) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6683706B1 (en) | 1999-11-10 | 2004-01-27 | Hewlett-Packard Development Company, L.P. | System and method for scanning a document |
JP3780810B2 (ja) * | 2000-03-27 | 2006-05-31 | コニカミノルタビジネステクノロジーズ株式会社 | 画像処理回路 |
US6765703B1 (en) | 2000-09-27 | 2004-07-20 | Kabushiki Kaisha Toshiba | Method and apparatus for sensing image |
US20050099163A1 (en) * | 2003-11-08 | 2005-05-12 | Andigilog, Inc. | Temperature manager |
US7605951B2 (en) * | 2004-02-10 | 2009-10-20 | Ricoh Company, Ltd. | Image reader, image forming and reproducing apparatus, and image reading method |
JP4597932B2 (ja) * | 2006-09-19 | 2010-12-15 | 株式会社リコー | 画像読取信号処理icおよび画像読取装置と画像形成装置 |
US20080079840A1 (en) * | 2006-10-03 | 2008-04-03 | Olympus Imaging Corp. | Focus detection device |
US20080094671A1 (en) * | 2006-10-20 | 2008-04-24 | Xerox Corporation | Image-data output system for a photosensor chip |
JP4601630B2 (ja) * | 2007-01-12 | 2010-12-22 | ルネサスエレクトロニクス株式会社 | リニアイメージセンサ |
JP4845801B2 (ja) * | 2007-04-26 | 2011-12-28 | キヤノン株式会社 | 画像処理装置及びメモリのアクセス制御方法 |
WO2010115909A1 (en) * | 2009-04-09 | 2010-10-14 | Oce-Technologies B.V. | Scanning method and device for obtaining grey scale images |
US8144215B2 (en) * | 2009-05-11 | 2012-03-27 | Himax Imaging, Inc. | Method and apparatus of using processor with analog-to-digital converter within image sensor to achieve high dynamic range of image sensor |
Citations (4)
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JPS63122356A (ja) * | 1986-11-12 | 1988-05-26 | Canon Inc | カラ−原稿読取装置 |
JPH02113765A (ja) * | 1988-10-24 | 1990-04-25 | Omron Tateisi Electron Co | イメージセンサの色信号分離回路 |
JPH05260297A (ja) * | 1992-03-13 | 1993-10-08 | Konica Corp | 固体撮像素子出力の信号処理方法 |
JPH09326930A (ja) * | 1996-06-06 | 1997-12-16 | Fuji Photo Film Co Ltd | リニアイメージセンサの出力画像信号の補正方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2849813B2 (ja) * | 1986-12-19 | 1999-01-27 | 富士写真フイルム株式会社 | 映像信号の形成装置 |
KR0125108B1 (ko) * | 1992-12-11 | 1997-12-01 | 가나이 쯔또무 | 정지화상기록 디지탈 카메라 |
US6449013B1 (en) * | 1993-10-27 | 2002-09-10 | Canon Kabushiki Kaisha | Image pickup apparatus capable of taking color natural images and high-resolution images of a monochrome object |
JP2816095B2 (ja) * | 1994-04-26 | 1998-10-27 | 三洋電機株式会社 | ビデオカメラの信号処理回路 |
US6509927B1 (en) * | 1994-12-16 | 2003-01-21 | Hyundai Electronics America Inc. | Programmably addressable image sensor |
US5874909A (en) * | 1996-02-13 | 1999-02-23 | Texas Instruments Incorporated | Analog to digital video converter |
US6570615B1 (en) * | 1998-07-14 | 2003-05-27 | Analog Devices, Inc. | Pixel readout scheme for image sensors |
-
1998
- 1998-03-19 JP JP10070156A patent/JPH11275371A/ja not_active Withdrawn
-
1999
- 1999-03-16 DE DE19980667T patent/DE19980667T1/de not_active Withdrawn
- 1999-03-16 GB GB9927330A patent/GB2342000B/en not_active Expired - Fee Related
- 1999-03-16 WO PCT/JP1999/001286 patent/WO1999048280A1/ja active Application Filing
- 1999-03-16 US US09/424,188 patent/US6717617B1/en not_active Expired - Fee Related
- 1999-03-18 TW TW088104267A patent/TW411691B/zh not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63122356A (ja) * | 1986-11-12 | 1988-05-26 | Canon Inc | カラ−原稿読取装置 |
JPH02113765A (ja) * | 1988-10-24 | 1990-04-25 | Omron Tateisi Electron Co | イメージセンサの色信号分離回路 |
JPH05260297A (ja) * | 1992-03-13 | 1993-10-08 | Konica Corp | 固体撮像素子出力の信号処理方法 |
JPH09326930A (ja) * | 1996-06-06 | 1997-12-16 | Fuji Photo Film Co Ltd | リニアイメージセンサの出力画像信号の補正方法 |
Also Published As
Publication number | Publication date |
---|---|
GB2342000A (en) | 2000-03-29 |
DE19980667T1 (de) | 2000-07-20 |
TW411691B (en) | 2000-11-11 |
US6717617B1 (en) | 2004-04-06 |
GB2342000B (en) | 2002-08-07 |
GB9927330D0 (en) | 2000-01-12 |
JPH11275371A (ja) | 1999-10-08 |
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