期刊
IEEE TRANSACTIONS ON IMAGE PROCESSING
卷 9, 期 5, 页码 889-896出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/83.841534
关键词
adaptive histogram equalization; contrast enhancement; histogram equalization; image enhancement
This paper proposes a scheme for adaptive image contrast enhancement based on a generalization of histogram equalization (HE). HE is a useful technique for improving image contrast, but its effect is too severe for many purposes. However, dramatically different results can be obtained with relatively minor modifications. A concise description of adaptive HE is set out, and this framework is used in a discussion of past suggestions for variations on HE, A key feature of this formalism is a cumulation function, which is used to generate a grey level mapping from the Local histogram, By choosing alternative forms of cumulation function one can achieve a wide variety of effects. A specific form is proposed. Through the variation of one or two parameters, the resulting process can produce a range of degrees of contrast enhancement, at one extreme leaving the image unchanged, at another yielding full adaptive equalization.
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