Method and apparatus for region and texture coding

Details Method and apparatus for region and texture coding Method and apparatus for region and texture coding

1992-02-12

1993-04-20

Couso, Jose L.

Image analysis

Histogram processing

For setting a threshold

382 22, G06K 940

Patent

active

052049205

ABSTRACT:
A luminance signal (Y) is applied to a segmentation device (2) which subjects the signal to a segmentation algorithm to produce a region image signal which is then encoded in a region image encoder (3). The region image signal is also applied to a region post-processor (4) in which an adapted smooth function is added to the region signal. The resulting modified region image signal is subtracted in subtractor (5) from the luminance signal to produce a texture signal which is encoded by a texture image encoder (6). The encoded signals are conveyed via a data channel (9) to respective region (12) and texture (14) image decoders and the recovered region image signal is post-processed in a processor (13) in the same manner as with processor (4). The resulting modified region image signal and the recovered texture image signal are added in an adder (15) to produce a reconstructed luminance signal. The smoothing function takes account of step edge height between adjacent regions and the width of the regions, so that it can be applied to all contour edges without having to identify and avoid those which are erroneous with respect to the luminance signal.

REFERENCES:
patent: 4636863 (1987-01-01), Kaizaki et al.
patent: 4817038 (1989-03-01), Knoll et al.
patent: 4849914 (1989-07-01), Medioni et al.
patent: 4949281 (1990-08-01), Hillenbrand et al.
Kunt et al., "Second-Generation Image-Coding Techniques", Proc. of the IEEE, vol. 73, No. 4, Apr. 1985, pp. 549-574.
Moran et al., "Region and Texture Coding of TV Pictures", 3rd Intellectual Conference on Image Proc. and Its Applic. (IPA 89), Warwick, UK., Jul. 1989, pp. 536-540.

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