Image filtering system performing transform coding of image data

Details Image filtering system performing transform coding of image data Image filtering system performing transform coding of image data

1991-03-20

1992-12-22

Couso, Jose

Image analysis

Histogram processing

For setting a threshold

382 43, 358432, 358433, G06K 940

Patent

active

051739526

ABSTRACT:
An image filtering system includes a storage device for storing image data which are partitioned into blocks composed of a predetermined number of picture elements for an orthogonal transform and represent an entire input image therein, an address selecting device for selecting addresses of the storage device, from which image data corresponding to respective predetermined object regions of a frame and stored at the selected addresses are read, and a sum-of-products calculating device for multiplying each of the image data of picture elements read out of the storage device by a corresponding coefficient of an operator, which is comprised of a predetermined number of coefficients, for adding up the thus obtained products for each of the object regions and for outputting a sum signal representing a sum of the products for each of the object regions. In the image filtering system, the address selecting device selects the addresses such that a storage area of the storage device corresponding to each of the object regions does not spread over adjoining ones of the blocks. Thereby, there is prevented occurrence of a block noise originating from a block in which motion compensation is not appropriately performed. Consquently, a prediction error of a quantity of codes can be substantially decreased.

REFERENCES:
patent: 4691329 (1987-09-01), Juri et al.
patent: 4703349 (1987-10-01), Bernstein
patent: 4776030 (1988-10-01), Tzou
patent: 4920426 (1990-04-01), Hatori et al.
patent: 5051840 (1991-09-01), Watanabe et al.
IEEE/IEICE Global Telecommunications Conference, vol. 1, Nov. 15, 1987, Tokyo pp. 453-457; Tamitani et al.: `A Real-Time Video Signal Processor Suitable for Motion Picture Coding Applications`* p. 453, col. 1, line 1-line 30 * * p. 453, col. 2, line 14-p. 454, col. 1, line 58, paragraph 1 * * p. 455, col. 1, line 17-line 74; FIG. 4 * * p. 456, col. 1, line 76-p. 457, col. 1, line 18; FIGS. 7, 8*.

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