Abstract
One of the crucial issue in image quality enhancement is the fidelity issue. There are three fidelity issues to must be studied. The 1st fidelity issue can be called that the information entropy of the enhanced image can not be increase. The 2nd fidelity issue can be called that the constituents of the enhanced image can not be increased. The 3rd fidelity issue can be called that the color relation of the enhanced image can not be changed. MSRCR will be used as an example of an image enhancement method based on the retinex series method. As an example, the three fidelity brought by multi-scale retinex with color restoration (MSRCR), which is one of series methods based on retinex, will be studied in this paper. The study will point out that the MSRCR will result in the three obvious distortions above mentioned.
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