We propose to extend block-based video-coding by an adaptive color space transform. The presented technique enables an encoder to switch between several given color space representations with the objective to maximize the overall ratedistortion gain. Simulations based on the current draft of the H.264/MPEG4-AVC 4:4:4 extensions demonstrate that our technique provides a rate-distortion performan...

In the spirit of the HSV color space, we introduce a simple transform of the RGB color cube into a light/dark dimension and a 2D hue. The hue is a normalized (barycentric) triangle with pure red, green, and blue at the vertices, often called the Maxwell Color Triangle. Each cross section of the space is the same barycentric triangle, and the light/dark dimension runs zero to one for each hue so...

This paper adresses the problem of color constancy on a large image database acquired with varying digital cameras and lighting conditions. Automatic white balance control proposed by an available commercial camera is not sufficient to provide reproducible color classification. A device-independent color representation may be obtained by applying a chromatic adaptation transform, from a calibra...

This paper proposed a novel representation for color image on quantum computer and further explored the basic color and geometric transformations on it. First, a multi-channel representation for color quantum image based on phase transform (CQIPT) is introduced in the form of a normalized state which captures information about colors RGB, transparency and positions. Then, a constructive polynom...

Recent years have seen tremendous increase in the generation, transmission, and storage of color images. A new lossless image compression method for progressive-resolution transmission of color images is carried out in this paper based on spatial and spectral transforms. Reversible wavelet transforms are performed across red, green, and blue color sub bands first. Then adaptive spectral transfo...

This paper considers the problem of finding facial features in frontal color images. For a given image, our method at first detects skin regions on it using color segmentation in a 2D plane of selected color space (HSV, YES, YCrCb or normalized RGB), and after that generates face candidates. Then, we apply methods of fuzzy mathematical morphology to obtain face candidates in order to find a par...

—Nowadays, the majority of images are in JPEG and MPEG compressed formats, and JPEG2000 is considered to be the next generation of compression standard due to the highperformance of discrete wavelet transform (DWT). It is timeconsuming and occupies too much memory in conventional image retrieval ways. In order to solve these problems, we use grading retrieval techniques to implement image retr...