WO2000011599A9 - Encoding and decoding a message within an image - Google Patents
Encoding and decoding a message within an imageInfo
- Publication number
- WO2000011599A9 WO2000011599A9 PCT/US1999/012376 US9912376W WO0011599A9 WO 2000011599 A9 WO2000011599 A9 WO 2000011599A9 US 9912376 W US9912376 W US 9912376W WO 0011599 A9 WO0011599 A9 WO 0011599A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pixels
- data
- glyph
- pkel
- value
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/1408—Methods for optical code recognition the method being specifically adapted for the type of code
- G06K7/143—Glyph-codes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/06009—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
- G06K19/06046—Constructional details
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
Definitions
- Fig. 14G to Fig. 14 J show the individual blocks of the four parallel blocks of Fig. 14F.
- n there can be m GPs and n BPs in a cell where n is larger then m (Fig. 3B).
- Each cell has a cell contrast (CC) which is a function of the pixel values of all the pixels of the cell.
- the pixel value of the GP pixel can be changed so that the cell contrast is small, preferably the smallest possible. In this way, the two binary values can be easily distinguished. Furthermore, due to the use of the absolute function, whether the background is dark or hght, the binary value can be encoded in the same way. Of course, the choice of encoding a "1" and a "0" in the above-described way is arbitrary. One can just as easily encode the two binary values in the opposite way.
- BPl to BP9 each represent the pixel value of the pixel it represents (i.e., the pixel BPl to BP9, respectively).
- the data capacity of the block for conveying data information is therefore 1820 x (3/4) bits, i.e., 1365 bits, which is 170 bytes.
- the sync capacity of the block for storing data decoding parameters is 1820 x (1/4) bits, i.e., 455 bits, which is 56 bytes.
- a double layered block has both sync cells and data ceUs.
- Fig. 12A shows a double layered block 1210 having both sync symmetry and data symmetry.
- the block has tile-wise symmetry, i.e.; each tUe has a mirror tile on the opposite side of the center tile 1200.
- Primary tile 1201 and its mirror tile 1202 are diagonaUy symmetric about the center tUe 1200.
- Another example of symmetry involves tile 1203 and tUe 1204.
- CeUs si to s32 depict the forward sync stream whereas cells si' to s32' show the backward sync stream.
- one decodes the displayed image by capturing the displayed image as a glyph image, transforming the glyph image to reduce the significance of the foreground image and finding the logical values represented. From the pixel value of a glyph cell, the logical value of the glyph cell can be decoded by reversing the encoding method of "1" and "0" above.
- This technique is equivalent to inspecting the glyph map to find the contrasting white dots (pixels) and filling in the glyph map in the black area between the white dots at locations one ceU-length apart to determine aU the glyph pixel locations.
- the above technique of calculation is only one practical method of ascertaining the positions of the glyph pixels, whether in a logical "0" or "1" state.
- One skilled in the art wUl be able to select other alternative methods.
- Fig. 20B Ulustrates an embodiment of a reader for reading the embedded message from the visual image, such as one displayed on the display 2008.
- the reader 2014 includes an imager 2016 which records the visual image displayed by the display.
- the imager 2016 can be any device, e.g., a scanner,
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000566783A JP2002523944A (en) | 1998-08-22 | 1999-07-17 | Encoding and decoding of messages in images |
DE19983484T DE19983484T1 (en) | 1998-08-22 | 1999-07-17 | Encoding and decoding a message in an image |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/138,591 | 1998-08-22 | ||
US09/138,591 US6256398B1 (en) | 1998-08-22 | 1998-08-22 | Encoding and decoding a message within an image |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2000011599A1 WO2000011599A1 (en) | 2000-03-02 |
WO2000011599A9 true WO2000011599A9 (en) | 2000-10-26 |
Family
ID=22482715
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1999/012376 WO2000011599A1 (en) | 1998-08-22 | 1999-07-17 | Encoding and decoding a message within an image |
Country Status (4)
Country | Link |
---|---|
US (3) | US6256398B1 (en) |
JP (1) | JP2002523944A (en) |
DE (1) | DE19983484T1 (en) |
WO (1) | WO2000011599A1 (en) |
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