Image enhancement method using histogram equalization

Details Image enhancement method using histogram equalization Image enhancement method using histogram equalization

1997-06-27

1999-07-13

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Gray scale transformation

348671, 382169, H04N 514

Patent

active

059233834

ABSTRACT:
In an image enhancement method is disclosed using a histogram equalization for an input image expressed in a predetermined number of gray levels. While calculating the probability density function of the gray levels of the input image, for use in a histogram equalization, the number of occurrences of each gray level are constrained not to exceed a predetermined value. Then a histogram equalization is performed on the input image based on the calculated probability density (or distribution) function. As a result, the mean brightness of the input image does not change significantly by the histogram equalization. Additionally, noise is prevented from being greatly amplified.

REFERENCES:
J.S. Lim, "Two-dimensional Signal and Image Processing," Prentice Hall, Englewood Cliffs, New Jersey, 1990.
R.C. Gonzalez and P. Wints, "Digital Image Processing," Addison-Wesley, Reading, Massachusetts, 1997.

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