Method for image enhancing using quantized mean-separate histogr

Details Method for image enhancing using quantized mean-separate histogr Method for image enhancing using quantized mean-separate histogr

1997-03-07

1999-01-05

Boudreau, Leo H.

Image analysis

Histogram processing

382254, G06K 900

Patent

active

058570330

ABSTRACT:
A histogram equalization method for enhancing an image is provided and includes the steps of: quantizing the level of input image signals; quantizing a mean level of quantized input image signals by a unit of a picture; splitting quantized input image signals into a predetermined number of quantized sub-images according to a quantized mean level; calculating a cumulative density function value of each quantized sub-image; interpolating the cumulative density function value of each sub-image according to input image signals and the cumulative density function value of each quantized sub-image; and independently histogram-equalizing each quantized sub-image according to the interpolated cumulative density function value of each quantized sub-image, to thereby enhance the contrast and preserve the overall brightness of a given image as well as simplify the circuit hardware.

REFERENCES:
patent: 4353092 (1982-10-01), Bailey et al.
patent: 5489782 (1996-02-01), Wernikoff

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