Binarizing system of picture image signals

Details Binarizing system of picture image signals Binarizing system of picture image signals

1985-03-08

1988-03-15

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358282, 358284, 382 53, G06K 938

Patent

active

047318627

ABSTRACT:
A system preprocesses analog picture image signals formed by scanning a manuscript prior to binarization into signals representing black or white according to a predetermined threshold value, compares a digital signal of a picture element to be corrected and of a signal of a picture element at least one main scanning line before the picture element to be corrected and positioned at the same position as the picture element to be corrected in an auxiliary scanning direction which is attenuated with each main scanning line or lines are compared. The one of these two signals having a larger level at a given time is used as a reference signal showing the nature of tone of the manuscript. When the level of digital picture image signal of the picture element to be corrected is closer to a black or white than the level of the reference signal, the level of the digital picture image signal is adjusted towards black or white. In other cases, the level of the digital picture image signals is maintained. By this operation, the nature of tone of the manuscript is emphasized and the accuracy of judgement in later binarizing the analog picture image signals is improved.

REFERENCES:
patent: 3106699 (1963-10-01), Kamentsky
patent: 4430748 (1984-02-01), Tuhro et al.
Schroeder, E. N., "Threshold Detector", IBM Technical Disclosure Bulletin, vol. 24, No. 4, 9/81, pp. 1821-1824.

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