Spatial filter of an image signal processor providing alternatin

Details Spatial filter of an image signal processor providing alternatin Spatial filter of an image signal processor providing alternatin

1993-08-19

1994-09-27

Couso, Jose L.

Image analysis

Histogram processing

For setting a threshold

382 54, G06K 936, G06K 938, G06K 940

Patent

active

053513126

ABSTRACT:
An error distribution type image signal processor has a spatial filter which has a positive filter coefficient assigned to pixels adjoining a pixel of interest in main and sub scan directions and a negative filter coefficient assigned to pixels adjoining the pixel of interest in diagonal directions. The sum of a filter coefficient for the pixel of interest and the filter coefficients for the pixels adjoining it is unity. Therefore, high frequency image signals of the pixels adjoining the pixel of interest in the diagonal directions are attenuated, and high frequency image signals of the pixels adjoining the pixel of interest in the main and sub scan directions are amplified. Accordingly, amplitudes of the pixels adjoining the pixel of interest in the diagonal directions are minimal, so that an image of the pixel of interest is clarified and emphasized.

REFERENCES:
patent: 4356555 (1982-10-01), Ejiri et al.
patent: 4399461 (1983-08-01), Powell
patent: 4924509 (1990-05-01), Yokomizo

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