FIELD: information technology.
SUBSTANCE: module 63 for calculating the most significant bit calculates the most significant bits of the given w quantised coefficients. Module 64 for coding efficiency produces a code, representing the most significant bit, based on the calculation results. Module 65 for selecting the significant bit selects the significant bits of each of the w quantised coefficients based on the most significant bit. Module 66 for coding efficiency produces a code, representing the absolute values of w quantised coefficients based on the selected significant bits. Module 67 for selecting the sign selects a sign from w quantised coefficients, indicating whether each quantised coefficient is positive or negative. Module 68 for coding efficiency produces the indicated w signs.
EFFECT: provision for coding with compression and decoding image data, and decode image data with less delay.
24 cl, 40 dwg
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