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This paper presents an image enhancement and space-variant color reproduction method based on adaptive sigmoid function for endoscopic image. At first, using YCBCR conversion matrix, the color image is separated into luminance and chrominance components. The adaptive sigmoid function with two controlling parameters is applied on the uniformly distributed luminance pixels. The space-variant color reproduction...
Many researchers have studied the issue of image defogging and enhancement, but there is no objective criterion to evaluate the defogging results. Based on the visual differences of images before and after defogging, valid edge intensity is defined to denote the detail performance of image, and color intensity in CIELAB color space is defined to denote the color performance of image. At last, the...
In low-end imaging systems which adopt low pixel precision, color bit-depth of an image is limited to a few bits. As a result, contouring effect tends to occur in smooth regions leading to annoying visual artifacts. Besides, the output color bit-depth is sometimes restricted in low-end systems. To enhance the visual quality in low-end imaging systems, contouring artifacts should be concealed as much...
This paper presents a method of enhancing image quality based on the analysis of scene categories, and its practical software implementation. The proposed method analyzes the scene of input images and calculates the probabilities for five predetermined scene categories; i.e. ldquoPortraits,rdquo ldquoLandscapes,rdquo ldquoNight scenes,rdquo ldquoFlowers (close-up)rdquo and ldquoOthers.rdquo The quality...
In this paper we will focus on color problems which occur if we utilize MSR as an image processing technique, and propose a modified Luminance Based MSR (LB_MSR) algorithm. There are two novelties in our algorithm. Firstly, we only process the luminance channel which is obtained by principal component analysis (PCA). PCA provides orthogonality between channels, thus allow the color to remain stable...
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