To achieve high image quality throughout a digital imaging system, the first requirement is to ensure the quality of the device that captures real-world physical images to digital images, for example a desktop scanner. Several factors have influence on this quality: optical resolution, bit depth, spectral sensitivities, and acquisition noise, to mention a few. In this study we focus on the colo...

The quality of several colour image difference metrics, pixelwise CIELAB DEab, S-CIELAB, iCAM, Structural Similarity Index, Universal Image Quality and the hue-angle algorithm, have been investigated. These results were compared with the results from a psychophysical experiment in which the perceptual image difference was evaluated. Six original images were reproduced using six different colour...

This book covers the classical methods in image processing and introduces many recent applications. The described applications span a broad range of fields, including medical and dental imaging, multimedia search and retrieval, and tracking and security. The book opens with a description of the physical process of image formation and color perception. Several color spaces are defined and severa...

Color gamut characterization is an essential step in the ICC profile generation for imaging devices. It is also needed as part of evaluation and comparison of image quality achievable by different imaging systems. A novel technique is presented for characterizing the color gamut of an imaging device via ray tracing in the CIELAB color space. Initially, the convex hull of the set of measurement ...

This research aimed to compare the effects of pigments extracted from dried petal meal of marigold flower and synthetic pigments on productive performance of laying hens, egg quality and antioxidant properties of the egg. A total of 64 laying hens, aged 75 weeks, were distributed in a completely randomized design in 4 treatments and 4 replications containing 4 hens per cages. Experimental group...

The color rendition ad hoc team of INCITS W1.1 is working to address issues related to color and tone reproduction for printed output and its perceptual impact on color image quality. The scope of the work includes accuracy of specified colors with emphasis on memory colors, color gamut, and the effective use of tone levels, including issues related to contouring. The team has identified three ...

Bacteria Foraging Optimization a nature-inspired optimization has drawn the attention of researchers because of its efficiency in solving real-world optimization problems arising in several application domains. Color image quantization is an important process of representing true color images using a small number of colors. Existing color reduction techniques tend to alter image color structure...

Color images reveal more meaningful information to the human observers rather than grayscale ones. Regardless of the advantages of the existing well-known objective image quality measures, one of the common and major limitations of these measures is that they evaluate the quality of grayscale images only and don’t make use of color information. In this paper we propose an improved method for im...

Traditional color appearance modeling has recently matured to the point that available, internationally recommended models such as CIECAM02 are capable of making a wide range of predictions, to within the observer variability in color matching and color scaling of stimuli, in somewhat simplified viewing conditions. It is proposed that the next significant advances in the field of color appearan...

Digital watermarking is a technique for copyright protection. In literature, many watermarking methods for gray images have been presented. Some of them are directly applied to the luminance component of a color image. A previous method applies to the difference between RGB components instead, and shows that the image quality can be improved. In this paper, we present a robust color image water...