A retinex-based image enhancement scheme with noise aware shadow-up function

Chien Cheng Chien; Yuma Kinoshita; Sayaka Shiota; Hitoshi Kiya

doi:10.1117/12.2521585

22 March 2019 A retinex-based image enhancement scheme with noise aware shadow-up function

Chien Cheng Chien, Yuma Kinoshita, Sayaka Shiota, Hitoshi Kiya

Proceedings Volume 11049, International Workshop on Advanced Image Technology (IWAIT) 2019; 110492K (2019) https://doi.org/10.1117/12.2521585
Event: 2019 Joint International Workshop on Advanced Image Technology (IWAIT) and International Forum on Medical Imaging in Asia (IFMIA), 2019, Singapore, Singapore

Abstract

This paper proposes a novel image contrast enhancement method based on both a noise aware shadow-up function and Retinex (retina and cortex) decomposition. Under low light conditions, images taken by digital cameras have low contrast in dark or bright regions. This is due to a limited dynamic range that imaging sensors have. For this reason, various contrast enhancement methods have been proposed. Our proposed method can enhance the contrast of images without not only over-enhancement but also noise amplification. In the proposed method, an image is decomposed into illumination layer and reflectance layer based on the retinex theory, and lightness information of the illumination layer is adjusted. A shadow-up function is used for preventing over-enhancement. The proposed mapping function, designed by using a noise aware histogram, allows not only to enhance contrast of dark region, but also to avoid amplifying noise, even under strong noise environments.

Citation Download Citation

Chien Cheng Chien, Yuma Kinoshita, Sayaka Shiota, and Hitoshi Kiya "A retinex-based image enhancement scheme with noise aware shadow-up function", Proc. SPIE 11049, International Workshop on Advanced Image Technology (IWAIT) 2019, 110492K (22 March 2019); https://doi.org/10.1117/12.2521585

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