System and method for correcting gray scale in an imaging appara

Details System and method for correcting gray scale in an imaging appara System and method for correcting gray scale in an imaging appara

1998-03-17

2000-02-08

Rogers, Scott

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

382168, 358455, 358522, 348254, G06T 500, G06T 540, H04N 140, H04N 1407, H04N 5202

Patent

active

060235330

ABSTRACT:
An input image is divided into relatively small blocks of pixels. Border data defining the areas are periodically calculated. For each pixel, a pair of selection pulses indicative of the area where the pixel is located is generated. In response to the pair of pulses, the gray scale characteristic is calculated for each area. The gray scale of the input image is corrected using one of the gray scale characteristic associated with each area to providing a corrected image signal for the area. In response to the pair of pulses, the corrected image signals are combined into an output image signal. An optimal gray scale correction is made for each area. The selection pulses are configured to gradually change near the borders thereby making the reproduced image appear natural.

REFERENCES:
patent: 5517333 (1996-05-01), Tamura et al.
patent: 5715377 (1998-02-01), Fukushima et al.

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