Signal encoding and decoding system

Details Signal encoding and decoding system Signal encoding and decoding system

1990-10-09

1993-05-25

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

358433, G06K 936

Patent

active

052147215

ABSTRACT:
An encoding/decoding apparatus is described wherein an encoding apparatus comprises a feature-image-extracting section, a three-dimensional shape model adjustment section, a brightness information detection section, a patch dividing section and a threshold processing section, and a decoding apparatus comprises a three-dimensional shape model forming section and a synthesizing section. Feature image information extracted from input signals by the extracting section is adjusted with three-dimensional shape basic model information by the adjustment section and then a brightness diffusion value for each triangle patch constituting the adjusted three-dimensional shape model is detected by the detection section. When the detected diffusion value is larger than a predetermined value, the processing section subjects the dividing section to divide the patch into three small patches, and the brightness diffusion value for each small patch is further detected by the detecting section, while the former is lower than the latter, the processing section encodes the brightness information for the patch by referring to a code book storing different brightness information. The encoded information is then transmitted to the decoding apparatus, together with the divided patch information. At the decoding apparatus, output image signals are reproduced from the received information by referring to the contents of a three-dimensional shape model database and a brightness information dynamic code book.

REFERENCES:
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patent: 5052045 (1991-09-01), Peregrim et al.
patent: 5056154 (1991-10-01), Aono et al.
patent: 5065446 (1991-11-01), Suzuki et al.
J. Ostermamann et al. "Object-Oriented Analysis-Synthesis Coding Based on Moving 3D Objects" 1989 pp. 1-2.
Lorenzo Galla et al. "Facial Features Extraction in Videotelephone Images" Sep. 5, 1989.
K. Aizawa et al. "Model Based Analysis Synthesis Image Coding for Very Low Rate Image Transmission" Sep. 12, 1988.

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