Chromatic adaptation transforms are used in imaging systems to map image appearance to colorimetry under different illumination sources. In this paper, the performance of different chromatic adaptation transforms (CAT) is compared with the performance of transforms based on RGB primaries that have been investigated in relation to standard color spaces for digital still camera characterization a...

S. H. Kwok The Hong Kong University of Science and Technology Department of Information and Systems Management Clear Water Bay, Kowloon, Hong Kong Abstract. Out-of-gamut problems exist in color image processing and color reproduction in different devices. Extensive research has been done on transforming out-of-gamut colors to the inside of the output device’s color gamut for color reproduction....

In this paper a way of hiding text message (Steganography) in the gray image has been presented. In this method tried to find binary value of each character of text message and then in the next stage, tried to find dark places of gray image (black) by converting the original image to binary image for labeling each object of image by considering on 8 connectivity. Then these images have been con...

This paper deals with the conversion of a digital image of a person into a portrait engraved on the surface of a material (white foam with a dark surface). In this approach, a series of holes of varying diameter are drilled into the surface. A mapping is made from a set of numbers (RGB values) in the input image to a set of diameters for the holes to be drilled. The holes expose a white inner c...

Image segmentation is the important task for image analysis and understanding it. The segmentation of color image is challenging task in the image analysis process. Segmentation of color images gives more information than gray scale image. This paper performs segmentation of color image in different color spaces, as segmentation of RGB color image not always gives better segmentation results al...

This paper describes and compares two color spaces – YUV and RGB, taking into account possible human-computer interaction applications. Human perception-oriented properties are compared, including not only file size or bandwidth, but also subjective visibility of artifacts. 1700 tests on a group of 170 people were performed to describe the subjective quality of compressed YUV and RGB images. Th...

The paper presents a method for colour image segmentation based on a region growing procedure. The algorithm works without a priori knowledge about the number of regions in the image. The similarity of colour pixels is modelled by distance in different colour spaces (RGB, YUV and IHS). Additional median filtering and small region elimination procedures are investigated. The operation of algorit...