Image encoding based on judgement on prediction error

Details Image encoding based on judgement on prediction error Image encoding based on judgement on prediction error

1997-06-13

2000-02-22

Lee, Thomas D.

Image analysis

Image compression or coding

Adaptive coding

382238, 382236, 348400, 341 51, G06K 936, H04N 712, H03M 734

Patent

active

060289635

ABSTRACT:
There is provided an image encode apparatus which comprises a generation means for generating a prediction error from an encode target pixel value and a prediction value of the encode target pixel value, a judgment means for generating a generation frequency distribution of the prediction error to judge whether or not the generation frequency distribution is discrete and an entropy encode means for changing encode data corresponding to the prediction error and performing entropy encoding on the obtained encode data, in accordance with a judged result by the judgment means. Therefore, the encoding can be effectively performed even on such the image data having the discrete pixel value as in a CG image, a limited-color image or the like.

REFERENCES:
patent: 4363036 (1982-12-01), Subramaniam
patent: 4749983 (1988-06-01), Langdon, Jr.
patent: 5471207 (1995-11-01), Zandi et al.
patent: 5680129 (1997-10-01), Weinberger et al.
patent: 5761342 (1998-06-01), Yoshida
patent: 5764374 (1998-06-01), Seroussi et al.
patent: 5764804 (1998-06-01), Yajima et al.

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