Image analysis – Image compression or coding – Gray level to binary coding
Reexamination Certificate
2006-06-22
2009-11-17
Couso, Jose L (Department: 2624)
Image analysis
Image compression or coding
Gray level to binary coding
Reexamination Certificate
active
07620255
ABSTRACT:
An image processor for converting input multi-grayscale image data, into binary data for each of the pixels has a binary unit. If a grayscale value of the multi-grayscale image data of a target pixel is lower than a reference value less than ½ of a maximum grayscale value, the binary unit converts the input image data into the binary data of a “dot present” or “dot absent” based on a threshold matrix, in which a plurality of threshold values are dispersed without concentrating a plurality of low threshold values, and if the grayscale value of the multi-grayscale image data is higher than the reference value, the binary unit converts the input image data into the binary data of a “dot present”, and propagating an error by adding the error to the peripheral pixels based on a first error diffusion matrix.
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Couso Jose L
Hogan & Hartson LLP
Seiko Epson Corporation
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