Image processor for restoring bi-level pixel data to multi-level

Details Image processor for restoring bi-level pixel data to multi-level Image processor for restoring bi-level pixel data to multi-level

1992-06-09

2000-02-15

Couso, Jose L.

Image analysis

Pattern recognition

Feature extraction

382260, 382299, 358456, 358455, G06K 948, H04N 140

Patent

active

060261846

ABSTRACT:
When a multi-level image is recovered from a pseudo-half-tone bi-level image, a smoothing component and an edge emphasis component obtained on pixels around a specified pixel to be recovered is mixed. The edge emphasis is performed only when the monority pixels exist around the specified pixel. As to the edge emphasis, a narrow line is recovered by using a pair of windows of width of one pixel of the two sides in the edge emphasis direction to obtain an edge emphasis component of width of one pixel in the edge emphasis direction. As to the mixing, the size of the windows for smoothing and the size for the edge emphasis are made almost equal to each other. In order to prevent erroneous edge detection, edge emphasis is judged by using a region including the specified pixel and another without the specified pixel. Erroneous detection of an image of high spatial frequencies can be prevented by using four detection regions.

REFERENCES:
patent: 4903142 (1990-02-01), Hasebe et al.
patent: 4903316 (1990-02-01), Hongo et al.
patent: 5023919 (1991-06-01), Wataya
patent: 5058181 (1991-10-01), Ishihara et al.
patent: 5125045 (1992-06-01), Murakami et al.
patent: 5200841 (1993-04-01), Kotaki et al.
patent: 5231677 (1993-07-01), Mita et al.
patent: 5311328 (1994-05-01), Murata
Yoshinobu Mita et al., "High Fine Multi-Value Recovery of Binary Image by Neural Network", Japan Hard Copy, '90, NIP-24, pp. 233-236, 1990.

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