Image analysis – Pattern recognition – Classification
Patent
1993-04-09
1995-06-06
Boudreau, Leo H.
Image analysis
Pattern recognition
Classification
382232, 358433, 358461, 358463, G06K 940
Patent
active
054229642
ABSTRACT:
Coding and decoding of digital images by transformation of pixel blocks reduce the data bit rate. Transformation of blocks leads to discontinuities in brightness level for pixels bordering on block boundaries. These discontinuities are detected for each given bordering pixel by a change of sign of two level gradients respectively computed with the levels of two pixels adjacent to the bordering pixel. A brightness level of the bordering pixel is then corrected by a discontinuity correction factor evaluated from a discontinuity divergence equal to the absolute value of the difference between the brightness level of the bordering pixel and an arithmetical average of brightness levels of the two adjacent pixels, as a function of a quantization pitch associated with a block to which belongs the bordering pixel. The block is then corrected in its entirety to attenuate the differences of average brightness levels between two adjacent blocks generated by the coding and decoding.
REFERENCES:
patent: 4553165 (1985-11-01), Bayer
patent: 5065444 (1991-11-01), Garber
patent: 5220616 (1993-06-01), Downing et al.
patent: 5235434 (1993-08-01), Wober
Devimeux Daniel
Jolivet Jean-Claude
Anderson D. Rick
Boudreau Leo H.
SAT (Societe Anonyme de Telecommunications
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