Image analysis – Histogram processing – For setting a threshold
Patent
1990-03-23
1992-09-01
Moore, David K.
Image analysis
Histogram processing
For setting a threshold
382 21, G06K 900
Patent
active
051446880
ABSTRACT:
An improved method for coding and decoding digital images by partitioning images into blocks and coding each image separately according to visually significant responses of the human eye. Coding is achieved by calculating and subtracting a mean intensity value from digital numbers within each block or partition and detecting visually perceivable edge locations within the resultant residual image block. If a visually perceivable edge is contained within the block, gradient magnitude and orientation at opposing sides of the edge within each edge block are calculated and appropriately coded. If no perceivable edge is contained within the block, the block is coded as a uniform intensity block. Decoding requires receiving coded mean intensity value, gradient magnitude and pattern code, and then decoding a combination of these three indicia to be arranged in an orientation substantially similar to the original digital image.
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Bovir Alan C.
Chen Dapang
Board of Regents , The University of Texas System
Moore David K.
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