Method of processing sampled signal valves produced by a color i

Details Method of processing sampled signal valves produced by a color i Method of processing sampled signal valves produced by a color i

1989-10-02

1991-08-13

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 44, H04N 514

Patent

active

050400649

ABSTRACT:
Blurring along edges between regions of different color characteristics in interpolated color images is avoided by a signal processing technique that segments the fully sampled channel into a plurality of contiguous image regions of respectively different image characteristics. The segmentation mechanism is such that, within a respective region, the fully sampled signal values are associated with a common image characteristic. A boundary between adjacent regions occurs where the segmentation mechanism has inferred the presence of an edge between sub-sampled locations and has assigned signal values for successive sampling locations of the fully sampled channel on opposite sides of the edge in accordance with different image characteristics. After the image has been segmented, within each region, signal values for non-sampled locations of a sub-sampled channel are interpolated in accordance with a predetermined relationship between fully sampled and sub-sampled signal values at a sampling location in that region whereat each of fully sampled and sub-sampled signal values have been produced. In addition, more than one segmentation mechanism may be employed. In this case, the image processing performance of each segmentation scheme is weighted. Interpolation values based upon each segmentation scheme are then combined as a weighted average.

REFERENCES:
patent: 4630307 (1986-12-01), Cok
patent: 4642678 (1987-02-01), Cok
patent: 4764805 (1988-08-01), Rabbani et al.
R. Nevatia, Image Segmentation, Handbook of Pattern Recognition and Image Processing, 1986, pp. 215-231.

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