초록 ▼

A system of coding moving image signals produces a predictive error signal by a predictive coding based on inter-frame correlation and quantizing the predictive error signal for each block of a picture frame constituted by N lines of M pixels. The system includes a block coding/non-coding decision u

A system of coding moving image signals produces a predictive error signal by a predictive coding based on inter-frame correlation and quantizing the predictive error signal for each block of a picture frame constituted by N lines of M pixels. The system includes a block coding/non-coding decision unit for calculating a first evaluation value Sm of the predictive error signal for each block of the picture frame. This unit decides that block non-coding is applicable when the first evaluation value Sm is less than a first threshold value T1 and that block coding is applicable when the first evaluation value Sm is greater than the first threshold value T1. The predictive error signal is not transmitted when the result of the decision is for block non-coding, and the predictive error signal is quantized and transmitted when the result of the decision is for block coding.

대표청구항 ▼

A system for coding moving image signals using a predictive error signal produced by predictive coding base on inter-frame correlation, comprising: orthogonal transformation means for transforming orthogonally the predictive error signal to generate a transformed error signal; quantization means for

A system for coding moving image signals using a predictive error signal produced by predictive coding base on inter-frame correlation, comprising: orthogonal transformation means for transforming orthogonally the predictive error signal to generate a transformed error signal; quantization means for quantizing the transformed error signal for each block of a picture frame constituted by N lines of M pixels; and block coding/non-coding decision means for calculating a first evaluation value of the predictive error signal for each block of the picture frame, for deciding that block non-coding is applicable when the first evaluation value is less than a first threshold value, for deciding that block coding is applicable when the first evaluation value Sm is greater than the first threshold value, for preventing quantization of the transformed error signal when block non-coding is applicable, and for permitting quantization of the transformed error signal when block coding is applicable, said block coding/non-coding decision means dividing each block into a plurality of sub-blocks having a size smaller than the block, calculating a sub-block evaluation value for each sub-block, comparing the sub-block evaluation value with a sub-block threshold value, and deciding that the block in question is to be coded when at least one coding sub-block exists and otherwise deciding that the block in question is not to be coded.