Apparatus for deciding DCT block classes in a DVCR

Details Apparatus for deciding DCT block classes in a DVCR Apparatus for deciding DCT block classes in a DVCR

1996-06-03

1998-05-05

Boudreau, Leo

Image analysis

Image compression or coding

Transform coding

382251, G06K 936, G06K 946

Patent

active

057487910

ABSTRACT:
An apparatus for deciding DCT block classes in a DVCR includes a scanning section for scanning AC coefficients among coefficients of respective DCT blocks, an absolute-value getting section for taking absolute values of the AC coefficients, a maximum value detecting section for obtaining the maximum values of respective DCT blocks from outputs of the absolute-value getting section, a minimum value detecting section for obtaining the minimum values from the maximum values of the DCT blocks obtained by the maximum value detecting section, and a deciding section for comparing outputs of the minimum value detecting section as threshold values with outputs of maximum value detecting section to decide the classes with respect to the DCT blocks. Thus, the threshold values used for deciding the classes of the DCT blocks are obtained by considering relative characteristics between the DCT blocks within a macro block and quantization step size to enable adaptive class categorization of the DCT blocks with respect to an input image, thereby enhancing quantization efficiency to improve picture quality.

REFERENCES:
patent: 5481309 (1996-01-01), Turi et al.

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