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《Acta Electronica Sinica》 2001-04
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Image Contrast Enhancement by Wavelet Based Homomorphic Filtering

ZHANG Xin-ming,SHEN Lan-sun(Laboratory of Signal & Information Processing,Beijing Polytechnic University,Beijing 100022,China)  
A new spatial-frequency analysis method based on wavelets is applied to homomorphic filtering to enhance the contrast of an image.The wavelet analysis coefficients are processed using a high-pass filter to attenuate the low spatial frequencies and amplify the high spatial frequencies.So the undesired contributions within the image due to light source nonuniformity can be reduced and the object features can be emphasized.Experiments show that the method performs well in enhancing the local contrast of an image while maintaining its global appearance.
【CateGory Index】: TP391.4
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