Image encoding apparatus and image decoding apparatus

Details Image encoding apparatus and image decoding apparatus Image encoding apparatus and image decoding apparatus

2011-03-08

2011-03-08

Bali, Vikkram (Department: 2624)

Image analysis

Image compression or coding

C382S171000

Reexamination Certificate

active

07903888

ABSTRACT:
Even an image in which a gradation character/line image having variations in pixel values to a certain degree and a natural image are mixed can be reproduced with sufficient quality in the gradation character/line image and high encoding efficiency, and further, encoded data can be generated with high encoding efficiency. An extraction unit binarizes pixel values in an input block with a predetermined threshold, thereby generates identification information identifying pixels to be substituted and pixels not to be substituted. An average differential value generation unit calculates a differential value between an average value of the pixels to be substituted and an average value of the pixels not to be substituted. A substitute color generation unit subtracts the differential value from the pixels to be substituted. An encoding unit encodes the identification information, the differential value and pixel values of the block after substitution.

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