Diffusion is an efficient localized image regularization method based on the analysis of image structures such as direction and magnitude. However, the localization at weak features which have small brightness variations is fundamentally difficult. This often results in removal of weak features. We address this problem with perceptual maximum variation modeling. In our method, diffusion flow of...

This paper describes a fast and novel technique for color quantization using reduction of color space dimensionality. The color histogram is repeatedly subdivided into smaller and smaller classes. The colors of each class are projected on a carefully selected line, such that the color dis-similarities are preserved. Instead of using the principal axis of each class, the line is de®ned by the me...

This paper mainly focuses on image enhancement technique using soft computing approach like fuzzy sets. Image enhancement primarily covers noise detection and reduction from digital color image. To overcome the color disorder on edge and texture pixel, here each color component of a pixel is correlated to the other two corresponding color components of the same pixel. Here filtering is applied ...

A new color image encryption algorithm combining compressive sensing with Arnold transform is proposed, which can encrypt the color image into a gray image. Considering the dimensional reduction and random projection of compressive sensing, we utilize compressive sensing to encrypt and compress the three color components of color image simultaneously. The three encrypted and compressed color co...

Current trends in image coding exploit the advantage of subband / wavelet decompositions in reducing the complexity in optimal scalar / vector quantizer (SQ / VQ) design. Compression ratios of the order of 10: 1 to 20: 1 with high visual quality has been achieved by using vector quantization of subband decomposed color images in peceptually weighted color spaces. We report the performance of th...

This research investigated the efficacy of chlorine dioxide (ClO2), ultraviolet (UV) irradiation, UV in combination with chlorine dioxide (UV/ClO2), and UV in combination with hydrogen peroxide (UV/H2O2) for decolorizing three reactive azo dyes (sultan red, indigo blue and cypress green) and treated textile-manufacturing wastewater. The objective was to determine the best treatment for reducing...

JPEG (Joint Photographic Experts Group) is an international standard to compress and store digital color images [5]. Given a color image that was previously JPEG-compressed in some hidden color space, we aim to estimate this unknown compression color space from the image. This knowledge is potentially useful for color image enhancement and JPEG re-compression. JPEG operates on the discrete cosi...

acquired color deficiency in the tritan axis in parkinson’s disease has already been reported, manifesting itself as impaired performance in various visual tasks. however, its clinical significance has always been controversial. in this study we evaluated the performance of parkinson s disease patients in lanthony 15-desaturated clinical test and for the first time, compared it with the standar...