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. Author manuscript; available in PMC: 2019 Feb 1.
Published in final edited form as: IEEE Trans Image Process. 2017 Nov 9;27(2):938–948. doi: 10.1109/TIP.2017.2771449

Fig. 3.

Fig. 3

Illustration of the multi-layer model. (a) Image decomposition process. (b) Image enhancement model. Ic(x, y) represents an original image, Fi(x, y) indicates the low-frequency component, Ri(x, y) indicates the high-frequency component, Iec(x,y) indicates the enhanced image, D indicates image decomposition, C indicates image combination, and g(·) is a mapping function. (c) An example of image decomposition and enhancement using the multi-layer model. For simplicity, the operation symbols are not presented in (c).