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The paper proposes a method based on guided filter to enhance the driver face image under weak light environment. First, image is converted from RGB color space to HSV color space. Then based on the theory of Retinex algorithm, guided filter is applied to estimate the illumination, obtaining the reflection image which only contains the characteristics of the object. In order to restore the color of...
This paper proposes a novel wavelet based nonlinear image enhancement algorithm, including dynamic range compression, contrast enhancement and color restoration, for recorded images in non-uniform and uniform-dark lightning conditions. Dynamic range compression (DRC) has been applied by nonlinear function for enhancing dark and reducing the intensity of bright regions. The intensity has been tuned...
Many monitoring and reconnaissance images are shot in night without auxiliary light, so those images are usually very dim and need enhancement processing which can be realized by Retinex with a good effect, but Retinex needs the color restoration. Based on the contrastive analysis on the RGB and the HSI color space, the differences, advantages and disadvantages are compared considering the transformation...
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