Image analysis – Image compression or coding – Gray level to binary coding
Reexamination Certificate
2007-02-13
2007-02-13
Do, Anh Hong (Department: 2624)
Image analysis
Image compression or coding
Gray level to binary coding
C382S232000, C382S233000
Reexamination Certificate
active
10086142
ABSTRACT:
A method for decoding data that has been encoded in a monochrome medium utilizing the capability of the medium for grayscale resolution. A document is processed to provide an image in electronic format, in which each pixel has an assigned data value with a given bit depth. A mapping operation is performed for generating a monochrome data word (120), preferably having a reduced bit depth. The monochrome data word (120) can be used to encode multiple data fields (114, 116, 118). A printer (92) then produces a preserved document record (90) in which the appropriate monochrome data word (120) determines the grayscale value for each pixel. To decode the stored data, a scanner (86) is employed to obtain the grayscale value from the preserved document record (90). For each pixel, the grayscale value is then decomposed into multiple data fields (114, 116, 118), which can then be decoded to provide the information that was originally encoded.
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Abhyankar Vishwas G.
Bayley Robert B.
Breslawski Robert
Duncan Robert G.
Jones Robert S.
Blish Nelson Adrian
Do Anh Hong
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