Method for compressing and decompressing digital image data

Details Method for compressing and decompressing digital image data Method for compressing and decompressing digital image data

1996-09-03

1998-05-12

Coles, Sr., Edward L.

Image analysis

Image compression or coding

Lossless compression

382238, 382246, 3582612, 358426, H04N 141

Patent

active

057518602

ABSTRACT:
A compressing method consisting of generating a predicted value for the pixel of the digitized image to be compressed based on the values of at least two neighboring pixels is provided. After calculating the difference between the predicted value and the current pixel value, a prediction error is defined by a one-on-one mapping on the difference obtained. According to an advantageous feature of the mapping relationship, the required number of bits for representing the prediction error is less than that required for the difference per se. Afterwards, a parameter K is generated which is in proportion to the difference between the neighboring pixels used in prediction. According to the respective values of the parameter K, the next step is to encode each prediction error by assigning a variable-length Rice code to the prediction error of each pixel. If the Rice code formatted for a prediction error is longer than a predetermined length, the Rice code is disregarded and replaced by predetermined length of leading "1" bits followed by the value of current pixel.

REFERENCES:
patent: 4739308 (1988-04-01), Lienard
patent: 4916544 (1990-04-01), Lienard et al.
patent: 4922340 (1990-05-01), Iwai
patent: 5339077 (1994-08-01), Venbrux et al.
patent: 5448642 (1995-09-01), Yeh

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