Coding mode determination system

Details Coding mode determination system Coding mode determination system

1998-04-13

2000-10-31

Tadayon, Bijan

Image analysis

Image compression or coding

Interframe coding

382245, G06K 900

Patent

active

061414492

ABSTRACT:
This invention provides a mode determination system for maximizing the coding efficiency by minimizing the amount of generated encoded information. An intra-frame picture signal X of 16 pels 16 lines is divided into four sub-blocks of 8 pels.times.8 lines by a DCT block dividing unit. A DCT block dispersion calculation unit calculates the dispersions of the four sub-blocks, and a nonlinear function transform unit transforms the dispersions to values for estimating amounts of generated encoded information. An adder unit adds together the four values for estimating amounts of generated encoded information and outputs the sum. On the other hand, a motion compensated predictive difference Y of 16 pels.times.16 lines undergoes a processing similar to said intra-frame picture signal X by a DCT block dividing unit, a DCT block dispersion calculation unit, a nonlinear function transform unit and an adder unit, and a value for estimating an amount of generated encoded information for the motion compensated predictive difference Y is outputted from the adder unit. An comparator unit outputs a signal for selecting a mode according to which of the two values for estimating amounts of generated encoded information is smaller.

REFERENCES:
patent: 4546386 (1985-10-01), Matsumoto et al.
patent: 4985782 (1991-01-01), Koga et al.
patent: 5412435 (1995-05-01), Nakajima
patent: 5757968 (1998-05-01), Ando
patent: 5798719 (1998-08-01), Wise et al.

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