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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. 1.

Fig. 1

Existing Retinex-based image enhancement models. (a) Multi-scale Retinex-based method [21]. (b) Naturalness preserved enhancement algorithm(NPEA) [4]. D indicates image decomposition, C indicates image combination, and M is illumination mapping.