Figure 3

The effect of bilateral filter (σ_d = 10, σ_r = 50).). (a) Original image; (b) Large-scale layer; (c) Detail layer. In order to avoid damaging color information of the image, only intensity image is processed by bilateral filter. Therefore, the color information must be separated from the original image. In this work, RGB color space is translated to color space by using (1), and the color-opposite data and is kept unchanged.