US20110090539A1 - Image correction method, apparatus, article and image - Google Patents
Image correction method, apparatus, article and image Download PDFInfo
- Publication number
- US20110090539A1 US20110090539A1 US12/978,317 US97831710A US2011090539A1 US 20110090539 A1 US20110090539 A1 US 20110090539A1 US 97831710 A US97831710 A US 97831710A US 2011090539 A1 US2011090539 A1 US 2011090539A1
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- Prior art keywords
- digital signal
- correction
- bits
- correction digital
- white
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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
- H04N1/401—Compensating positionally unequal response of the pick-up or reproducing head
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
Definitions
- the invention relates in general to an image correction method, and more particularly, to an image correction method to help avoid error images.
- the scanner is an intermediate between the photocopier and the camera.
- the application of scanners is restricted to special art work due to the very high cost.
- the rapidly growing computer technique and the active competition in the market result in signification cost reduction for the scanners.
- the scanner has become a popular peripheral of personal computers.
- scanners can be categorized into several types. Typically, scanners can be categorized into handheld scanner, sheet-feed scanner, card reader, film scanner and flatbed scanner.
- the flatbed scanner includes a glass flatbed on which the document to be scanned is disposed. By shifting the sensor, the information of the document is read. As the structure is not very complex and the method for using it is not difficult, plus the outstanding function expandability, the flatbed scanners have become the application main stream for the current computers.
- scanners are divided into black-and-white type and color type with respect to color display, and reflective type and transparent type with respect to the scanning method.
- the following uses a reflective type color scanner as an example to introduce the basic structure of a scanner.
- FIG. 1 the basic structure of a color scanner 10 is shown.
- the color scanner 10 comprises a lamp 102 , an optical system 104 , a charge-coupled device (CCD) 106 , and an analog/digital (A/D) converter 108 . Functions of various parts of the color scanner 10 are further described as follows.
- the lamp 102 When the lamp 102 is used as the light source of the color scanner 10 , the light generated by the lamp 102 is incident on the document 110 . The light is then reflected by the document 110 to project onto the optical system 104 .
- the lamp 102 can be a fluorescent lamp, a cold cathode ray tube, or a light emitting diode array.
- the optical system 104 consists of a reflection mirror 112 and a lens 114 . Being focused by the reflection mirror 112 and the lens 114 , the light reflected by the document 110 is reflected by the reflection mirror 112 , focused by the lens 114 , and then incident on the charge-coupled device 106 .
- the function of the charge-coupled device 106 includes converting the detected light intensity into photocurrent, which is then stored in the storage electrodes and converted into signal charges to generate various potential.
- the analog/digital converter 108 converts the analog signal of the charge-coupled device 106 into a digital signal, and transmits the digital signal into a computer 118 .
- a correction document is used for image correction.
- a black correction document and a white correction document are used for image correction. If the correction document contains any unwanted object thereon, the unwanted streaking (LBB) effect is generated in the scanned image.
- LBB streaking
- the present invention provides an image correction method to avoid error images. According to black and white characteristics, only the last few bits of a scanned digital signal are extracted during black correction. While performing white correction, only the first few bits of the scanned digital signal are extracted. The most significant bit of the digital signal is set as 1. Therefore, the LBB effect in scanned image caused by dust or spot on the correction document is avoided. Further, as fewer bits are extracted while scanning the digital signal, the memory requirement is reduced.
- the image correction method able to avoid error images provided by the present invention is suitable for use in a scanner. While performing black correction, a first correction digital signal is obtained by scanning a first document. Only the last few bits of the first correction digital signal are extracted. While performing white correction, a second correction digital signal is obtained by scanning a second correction document, and only first few bits of the second correction digital signal are extracted. Meanwhile, the most significant bit of the second correction digital signal is set as 1.
- the last few bits of the first correction digital signal are stored in a memory.
- the memory includes a random access memory (RAM).
- the first few bits of the second digital signal are stored in a memory such as a random access memory.
- the first correction document includes a black document.
- the second correction document includes a white correction document.
- the black correction includes the following steps.
- an image extraction device is used to obtain the first correction analog signal.
- the first correction analog signal is then converted into a first correction digital signal by the image extraction device.
- the image extraction device includes a charge-coupled device.
- the step of performing white correction further includes the following steps.
- the image extraction device is used to obtain the second correction analog signal.
- the second correction analog signal is then converted into a second correction digital signal by the image extraction device.
- the present invention provides an image correction method able to avoid error images.
- image correction method able to avoid error images.
- two opposite characteristics of black and white only the last few bits of the digital signal obtained by scanning are extracted during black correction. While performing white correction, only the first few bits of the digital signal obtained by scanning are extracted, and the most significant bit of the digital signal is configured as 1. Therefore, the LBB effect on the image caused by dust or spot on the correction document is avoided. Further, in the digital signal obtained by scanning, fewer bits are extracted, so that the required memory capacity is reduced.
- FIG. 1 shows the basic structure of a color scanner
- FIG. 2 shows the process flow of an image correction method for helping to avoid errors in images according to the present invention.
- step s 202 an image correction method able to avoid error images in one embodiment of the present invention is illustrated.
- the scanner uses the lamp to radiate a light on a first correction document.
- the light reflected by the document is then incident on a reflection mirror of an optical system, and focused by a lens of the optical system to obtain a first correction optical signal.
- An optoelectric conversion is performed to convert the first correction optical signal into an electrical first correction analog signal by an image extraction device (such as charge-coupled device).
- the first correction analog signal is then converted into a first correction digital signal by an analog/digital converter.
- the first correction document includes a black correction document (s 204 ). Only the extracted last few bits of the first correction digital signal are stored in a memory such as a random access memory, so that the storage capacity requirement of the memory is reduced (s 206 ).
- the lamp of the scanner is incident on the second document.
- the light is then reflected by the second document, incident on the reflection mirror of the optical system, and focused by the lens of the optical system to obtain a second correction optical signal.
- the second correction optical signal is converted into an electrical second correction analog electric signal by optoelectric conversion via the image extraction device.
- the second correction analog electric signal is converted into a second correction digital signal via the analog/digital converter.
- the response of the image extraction device is significant, so that the most significant bit of the second digital correction signal has to be set as 1. Therefore, only the first few bits (such as first 8 bits) of the second correction digital signal are extracted. In this way, the LBB effect caused in the scanned image by dust or spot on the second correction document is avoided.
- the second correction document includes a white correction document (s 208 ).
- the extracted first few bits of the second correction digital signal are stored in the memory such as the random access memory.
- the last few bits of the second correction digital signal are stored in the memory such as the random access memory.
- the requirement in storage capacity of the memory is reduced (s 210 ).
- the present invention uses the opposite characteristics of black and white to extract only the last few bits of the scanned digital signal for black correction and the first few bits of the scanned digital signal for white correction. Meanwhile, the most significant bit of the scanned digital signal for white correction is 1. Therefore, the LBB effect caused on the scanned image by dust or spot on the correction document is avoided. Further, in the scanned digital signal, fewer bits are extracted to reduce the capacity requirement of the memory.
Abstract
Description
- The present application is a continuation of U.S. patent application Ser. No. 12/754,056, filed on Apr. 5, 2010, which is a continuation of U.S. patent application Ser. No. 12/173,788, filed on Jul. 15, 2008, now U.S. Pat. No. 7,742,654, which is a continuation of U.S. patent application Ser. No. 10/064,612, filed on Jul. 31, 2002, now U.S. Pat. No. 7,421,145, each of which is hereby incorporated by reference in its entirety.
- 1. Field of the Invention
- The invention relates in general to an image correction method, and more particularly, to an image correction method to help avoid error images.
- 2. Description of the Related Art
- In terms of functionalities, the scanner is an intermediate between the photocopier and the camera. In the past, the application of scanners is restricted to special art work due to the very high cost. In recent years, the rapidly growing computer technique and the active competition in the market result in signification cost reduction for the scanners. Eventually, the scanner has become a popular peripheral of personal computers.
- Depending on the price or functionality, scanners can be categorized into several types. Typically, scanners can be categorized into handheld scanner, sheet-feed scanner, card reader, film scanner and flatbed scanner. The flatbed scanner includes a glass flatbed on which the document to be scanned is disposed. By shifting the sensor, the information of the document is read. As the structure is not very complex and the method for using it is not difficult, plus the outstanding function expandability, the flatbed scanners have become the application main stream for the current computers.
- Basically, scanners are divided into black-and-white type and color type with respect to color display, and reflective type and transparent type with respect to the scanning method. The following uses a reflective type color scanner as an example to introduce the basic structure of a scanner. Referring to
FIG. 1 , the basic structure of acolor scanner 10 is shown. Thecolor scanner 10 comprises alamp 102, anoptical system 104, a charge-coupled device (CCD) 106, and an analog/digital (A/D)converter 108. Functions of various parts of thecolor scanner 10 are further described as follows. - When the
lamp 102 is used as the light source of thecolor scanner 10, the light generated by thelamp 102 is incident on thedocument 110. The light is then reflected by thedocument 110 to project onto theoptical system 104. Thelamp 102 can be a fluorescent lamp, a cold cathode ray tube, or a light emitting diode array. - The
optical system 104 consists of areflection mirror 112 and alens 114. Being focused by thereflection mirror 112 and thelens 114, the light reflected by thedocument 110 is reflected by thereflection mirror 112, focused by thelens 114, and then incident on the charge-coupleddevice 106. - The function of the charge-coupled
device 106 includes converting the detected light intensity into photocurrent, which is then stored in the storage electrodes and converted into signal charges to generate various potential. - The analog/
digital converter 108 converts the analog signal of the charge-coupleddevice 106 into a digital signal, and transmits the digital signal into acomputer 118. - When the scanner is scanning a document or a picture, the non-uniformity of the lamp requires an image compensation operation. Generally speaking, a correction document is used for image correction. For example, for the reflective type scanning, a black correction document and a white correction document are used for image correction. If the correction document contains any unwanted object thereon, the unwanted streaking (LBB) effect is generated in the scanned image. Currently, there is no image correction method able to avoid such LBB effect.
- The present invention provides an image correction method to avoid error images. According to black and white characteristics, only the last few bits of a scanned digital signal are extracted during black correction. While performing white correction, only the first few bits of the scanned digital signal are extracted. The most significant bit of the digital signal is set as 1. Therefore, the LBB effect in scanned image caused by dust or spot on the correction document is avoided. Further, as fewer bits are extracted while scanning the digital signal, the memory requirement is reduced.
- The image correction method able to avoid error images provided by the present invention is suitable for use in a scanner. While performing black correction, a first correction digital signal is obtained by scanning a first document. Only the last few bits of the first correction digital signal are extracted. While performing white correction, a second correction digital signal is obtained by scanning a second correction document, and only first few bits of the second correction digital signal are extracted. Meanwhile, the most significant bit of the second correction digital signal is set as 1.
- In one embodiment of the present invention, the last few bits of the first correction digital signal are stored in a memory. The memory includes a random access memory (RAM).
- In one embodiment of the present invention, the first few bits of the second digital signal are stored in a memory such as a random access memory.
- In one preferred embodiment of the present invention, the first correction document includes a black document.
- In one preferred embodiment of the present invention, the second correction document includes a white correction document.
- In one embodiment of the present invention, the black correction includes the following steps. When the first correction signal is obtained by scanning the first correction document, an image extraction device is used to obtain the first correction analog signal. The first correction analog signal is then converted into a first correction digital signal by the image extraction device. The image extraction device includes a charge-coupled device.
- The step of performing white correction further includes the following steps. When the second correction signal is obtained by scanning the second correction document, the image extraction device is used to obtain the second correction analog signal. The second correction analog signal is then converted into a second correction digital signal by the image extraction device.
- According to the above, the present invention provides an image correction method able to avoid error images. According to two opposite characteristics of black and white, only the last few bits of the digital signal obtained by scanning are extracted during black correction. While performing white correction, only the first few bits of the digital signal obtained by scanning are extracted, and the most significant bit of the digital signal is configured as 1. Therefore, the LBB effect on the image caused by dust or spot on the correction document is avoided. Further, in the digital signal obtained by scanning, fewer bits are extracted, so that the required memory capacity is reduced.
- While the specification concludes with claims particularly pointing out and distinctly claiming the subject matter which is regarded as the invention, the objects and features of the invention and further objects, features and advantages thereof will be better understood from the following description taken in connection with the accompanying drawings in which:
- Both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
-
FIG. 1 shows the basic structure of a color scanner; and -
FIG. 2 shows the process flow of an image correction method for helping to avoid errors in images according to the present invention. - Prior to the description of the embodiment, it should be noted that although the embodiment is described using the scanning process for the reflection document as an example, for those skilled in the art, the invention is also applicable to the scanning process for the transparent document.
- Referring to
FIG. 2 , an image correction method able to avoid error images in one embodiment of the present invention is illustrated. In the image correction method, firstly, whether a black correction or a white correction is performed is determined in step s202. While performing black correction, the scanner uses the lamp to radiate a light on a first correction document. The light reflected by the document is then incident on a reflection mirror of an optical system, and focused by a lens of the optical system to obtain a first correction optical signal. An optoelectric conversion is performed to convert the first correction optical signal into an electrical first correction analog signal by an image extraction device (such as charge-coupled device). The first correction analog signal is then converted into a first correction digital signal by an analog/digital converter. While performing black correction, the response of the image extraction device is small, such that the first few bits of the first digital correction signal are zero, and only the last few bits (such as last 8 bits) are extracted. Thus, the LBB effect caused by dust or spot on the first correction document is avoided. Further, the first correction document includes a black correction document (s204). Only the extracted last few bits of the first correction digital signal are stored in a memory such as a random access memory, so that the storage capacity requirement of the memory is reduced (s206). - When white correction is performed, the lamp of the scanner is incident on the second document. The light is then reflected by the second document, incident on the reflection mirror of the optical system, and focused by the lens of the optical system to obtain a second correction optical signal. The second correction optical signal is converted into an electrical second correction analog electric signal by optoelectric conversion via the image extraction device. The second correction analog electric signal is converted into a second correction digital signal via the analog/digital converter. While performing white correction, the response of the image extraction device is significant, so that the most significant bit of the second digital correction signal has to be set as 1. Therefore, only the first few bits (such as first 8 bits) of the second correction digital signal are extracted. In this way, the LBB effect caused in the scanned image by dust or spot on the second correction document is avoided. The second correction document includes a white correction document (s208). The extracted first few bits of the second correction digital signal are stored in the memory such as the random access memory. As only the last few bits of the second correction digital signal are stored in the memory such as the random access memory. As only the last few bits of the second correction digital signal are stored, the requirement in storage capacity of the memory is reduced (s210).
- According to the above, the present invention uses the opposite characteristics of black and white to extract only the last few bits of the scanned digital signal for black correction and the first few bits of the scanned digital signal for white correction. Meanwhile, the most significant bit of the scanned digital signal for white correction is 1. Therefore, the LBB effect caused on the scanned image by dust or spot on the correction document is avoided. Further, in the scanned digital signal, fewer bits are extracted to reduce the capacity requirement of the memory.
- Other embodiments of the invention will appear to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples to be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (20)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/978,317 US20110090539A1 (en) | 2002-07-31 | 2010-12-23 | Image correction method, apparatus, article and image |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/064,612 US7421145B2 (en) | 2002-07-31 | 2002-07-31 | Image correction method, apparatus, article and image |
US12/173,788 US7742654B2 (en) | 2002-07-31 | 2008-07-15 | Image correction method, apparatus, article and image |
US12/754,056 US7881557B2 (en) | 2002-07-31 | 2010-04-05 | Image correction method, apparatus, article and image |
US12/978,317 US20110090539A1 (en) | 2002-07-31 | 2010-12-23 | Image correction method, apparatus, article and image |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/754,056 Continuation US7881557B2 (en) | 2002-07-31 | 2010-04-05 | Image correction method, apparatus, article and image |
Publications (1)
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US20110090539A1 true US20110090539A1 (en) | 2011-04-21 |
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Family Applications (4)
Application Number | Title | Priority Date | Filing Date |
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US10/064,612 Expired - Lifetime US7421145B2 (en) | 2002-07-31 | 2002-07-31 | Image correction method, apparatus, article and image |
US12/173,788 Expired - Lifetime US7742654B2 (en) | 2002-07-31 | 2008-07-15 | Image correction method, apparatus, article and image |
US12/754,056 Expired - Fee Related US7881557B2 (en) | 2002-07-31 | 2010-04-05 | Image correction method, apparatus, article and image |
US12/978,317 Abandoned US20110090539A1 (en) | 2002-07-31 | 2010-12-23 | Image correction method, apparatus, article and image |
Family Applications Before (3)
Application Number | Title | Priority Date | Filing Date |
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US10/064,612 Expired - Lifetime US7421145B2 (en) | 2002-07-31 | 2002-07-31 | Image correction method, apparatus, article and image |
US12/173,788 Expired - Lifetime US7742654B2 (en) | 2002-07-31 | 2008-07-15 | Image correction method, apparatus, article and image |
US12/754,056 Expired - Fee Related US7881557B2 (en) | 2002-07-31 | 2010-04-05 | Image correction method, apparatus, article and image |
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US (4) | US7421145B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US7773270B2 (en) * | 2004-01-07 | 2010-08-10 | Hewlett-Packard Development Company, L.P. | Image scanner feature detection |
US7568628B2 (en) | 2005-03-11 | 2009-08-04 | Hand Held Products, Inc. | Bar code reading device with global electronic shutter control |
US7770799B2 (en) | 2005-06-03 | 2010-08-10 | Hand Held Products, Inc. | Optical reader having reduced specular reflection read failures |
GB2480621A (en) * | 2010-05-25 | 2011-11-30 | St Microelectronics | Calibration of optical navigation devices in ambient light conditions |
Citations (6)
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---|---|---|---|---|
US4188643A (en) * | 1977-09-26 | 1980-02-12 | U.S. Philips Corporation | Method and arrangement for correcting errors in facsimile transmission |
US5262873A (en) * | 1990-11-07 | 1993-11-16 | Canon Kabushiki Kaisha | Image signal correcting in image data processing requiring only small memory capacity |
US5502578A (en) * | 1994-03-16 | 1996-03-26 | Contex A/S | Optical scanner having a variable resolution |
US5784180A (en) * | 1989-05-10 | 1998-07-21 | Canon Kabushiki Kaisha | Image memory apparatus |
US5943141A (en) * | 1996-11-29 | 1999-08-24 | Mita Industrial Co., Ltd. | Image reading apparatus having shading correction means using a reference data processing circuit |
US6134025A (en) * | 1988-09-08 | 2000-10-17 | Canon Kabushiki Kaisha | Dot image data output apparatus |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59153377A (en) * | 1983-02-21 | 1984-09-01 | Canon Inc | Shading correcting device |
US5485288A (en) * | 1991-03-01 | 1996-01-16 | Canon Kabushiki Kaisha | Image processing apparatus for converting a color image into a pattern image with a synthesized gradation image increasing in density closer to contour portions of the pattern image |
-
2002
- 2002-07-31 US US10/064,612 patent/US7421145B2/en not_active Expired - Lifetime
-
2008
- 2008-07-15 US US12/173,788 patent/US7742654B2/en not_active Expired - Lifetime
-
2010
- 2010-04-05 US US12/754,056 patent/US7881557B2/en not_active Expired - Fee Related
- 2010-12-23 US US12/978,317 patent/US20110090539A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4188643A (en) * | 1977-09-26 | 1980-02-12 | U.S. Philips Corporation | Method and arrangement for correcting errors in facsimile transmission |
US6134025A (en) * | 1988-09-08 | 2000-10-17 | Canon Kabushiki Kaisha | Dot image data output apparatus |
US5784180A (en) * | 1989-05-10 | 1998-07-21 | Canon Kabushiki Kaisha | Image memory apparatus |
US5262873A (en) * | 1990-11-07 | 1993-11-16 | Canon Kabushiki Kaisha | Image signal correcting in image data processing requiring only small memory capacity |
US5502578A (en) * | 1994-03-16 | 1996-03-26 | Contex A/S | Optical scanner having a variable resolution |
US5943141A (en) * | 1996-11-29 | 1999-08-24 | Mita Industrial Co., Ltd. | Image reading apparatus having shading correction means using a reference data processing circuit |
Also Published As
Publication number | Publication date |
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US7742654B2 (en) | 2010-06-22 |
US20100189378A1 (en) | 2010-07-29 |
US7881557B2 (en) | 2011-02-01 |
US20040022450A1 (en) | 2004-02-05 |
US7421145B2 (en) | 2008-09-02 |
US20090180710A1 (en) | 2009-07-16 |
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