Image processing

Image analysis – Histogram processing – For setting a threshold

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Details

358448, 358457, 382 27, G06K 940

Patent

active

052206165

ABSTRACT:
A method of digitally processing images, in the form of a two dimensional data element array, in which the image is compressed by dividing the array into blocks (2) and performing transformation thereon. In order to smooth discontinuities at the boundaries (1, 13, 3, 14) between the blocks (2) resulting from the compression, filtering is performed by sequentially scanning elements at the boundaries with a one dimensional operator matrix (6, FIG. 1). The matrix applies suitable weights to those elements and adjacent ones to effect smoothing.

REFERENCES:
patent: 4754492 (1988-06-01), Malvar
patent: 4860373 (1989-08-01), Hartless et al.
patent: 4941043 (1990-07-01), Jass
patent: 5101445 (1992-03-01), Call et al.
patent: 5119445 (1992-06-01), Suzuki et al.
Nachrichten Technik Elektronik-vol. 38, No. 5, May 1988, Berlin DD pp. 166-169, L. Arnold et al. "Adaptiv Transformationscodierung von Grauwertbildern mit vermindertem Blocking Effect", Section 3.2 pp. 168-149, FIG. 10.

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