MTF compensation apparatus

Details MTF compensation apparatus MTF compensation apparatus

1991-02-07

1992-09-01

Couso, Jose

Image analysis

Histogram processing

For setting a threshold

358447, G06K 940

Patent

active

051446863

ABSTRACT:
In a picture processing apparatus, respective results of subtraction calculation between the relevant pixel and the reference pixels are obtained by a subtraction arithmetic circuit. The resultant differences are converted nonlinearly by a nonlinear conversion circuit, and thereafter a summation calculation of these resultant differences are performed by a first addition arithmetic circuit. The obtained result is added to data of the relevant pixel by a second addition arithmetic circuit; thereby achieving MTF correction. By adequately selecting the input-output characteristic of the nonlinear conversion circuit, a stable contour line enhancement is achievable even when noise is present in the picture signal.

REFERENCES:
patent: 4163258 (1979-07-01), Ebihara et al.
patent: 4517607 (1985-05-01), Ohkouchi et al.
patent: 4817181 (1989-03-01), Kamiya
Mitsuo Kagi, "Image Printing Technology for the Printing and Electrical Engineer", Jun. 15, 1988, 250-257.

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