Image analysis – Image compression or coding – Predictive coding
Reexamination Certificate
2008-11-10
2011-10-25
Do, Anh Hong (Department: 2624)
Image analysis
Image compression or coding
Predictive coding
C382S232000, C382S236000
Reexamination Certificate
active
08045814
ABSTRACT:
An image compression device having a prediction unit for predicting a value of a compressing target pixel from peripheral values, and quantizing prediction error between a prediction value of the prediction unit and a value of an actual pixel in a predetermined quantizing step, comprising: a specific pixel level difference evaluation unit sequentially calculating the difference value between the level values as a sum of the prediction values corresponding to each of the compressed pixel immediately before the compressing target pixel and peripheral compressed pixels adjacent to the pixel and the quantization value of the prediction error, and evaluating the sameness of the difference value; and a quantization switching unit controlling the quantization in the quantizing step more precise than the quantizing step used when the difference value continuously indicates the same value as a result of the evaluation by the specific pixel level difference evaluation unit.
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Odagiri Jun-ichi
Yahagi Hironori
Yoshida Shigeru
Do Anh Hong
Fujitsu Limited
Greer Burns & Crain Ltd.
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