Enhancement method of low-illumination color image
A color image, low-illumination technology, applied in the field of image processing, to achieve strong contrast, enhanced low-illumination images, and good results
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[0026] The present invention will be further described below in conjunction with the accompanying drawings.
[0027] refer to figure 1 and figure 2 , a method for enhancing a low-illuminance color image, comprising the following steps:
[0028] S1: input low-light image f(x);
[0029] S2: Carry out color separation to input image, obtain R, G, B three component images respectively;
[0030] S3: adopt homomorphic high-frequency filter and homomorphic low-pass filter respectively to the image of three components, obtain the high-low frequency image of each component respectively, wherein high-frequency homomorphic filter function expression is:
[0031] h H (i,j)=1 / (1+D(i,j)^(-t))
[0032] The expression of the low-frequency homomorphic filter function is:
[0033]
[0034] where t is the adjustment parameter, D 0 Represents the cutoff frequency, D(i,j) represents the point (i,j) to the filter center (i 0 , j 0 )distance,
[0035] S4: Carry out linear scaling tra...
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