High quality film image correction and duplication method and sy

Details High quality film image correction and duplication method and sy High quality film image correction and duplication method and sy

1991-10-31

1993-06-29

Mancuso, Joseph

Image analysis

Histogram processing

For setting a threshold

358458, 382 6, 382 51, G06K 940

Patent

active

052241777

ABSTRACT:
A method and system for correcting a non-linear characteristic of an image, wherein an input image is digitized to produce digital image data representative of the image and a histogram of the digital image data is produced. At least a first pixel value characteristic of a variable under which the image was derived is extracted from the histogram. A plurality of non-linear correction curves relating original pixel values to corrected pixel values for different degrees of the variable are stored in a memory, and a particular one of the correction curves is selected based at least in part on the first extracted pixel value and a predetermined corrected pixel value. Corrected image data are then formed utilizing the selected correction curve by correcting each original pixel value of the image to a respective corrected pixel value based on the relationship therebetween defined by the selected correction curve, and a non-linearity corrected image is produced based on the corrected image data.

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patent: 5048110 (1991-09-01), Nakajima

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