Evaluation and modelization of chromatic discrimination. Effects on image palette
نویسندگان
چکیده
From a reduced set of experimental measurements, we have developed an algorithm that generates a mosaic of color discrimination ellipses, densely covering the region of the chromaticity diagram defined by the phosphors of a CRT monitor, with minimum overlapping between ellipses and leaving the minimum uncovered space. To test how well this mosaic covers color space, a set of digital color images has been filtered with it and the resulting palette reduction analyzed.
منابع مشابه
Color Features for Image Fingerprinting
Image fingerprinting systems aim to extract unique and robust image descriptors (in analogy to human fingerprints). They search for images that are not only perceptually similar but replicas of an image generated through mild image processing operations. In this paper, we examine the use of color descriptors based on a 24-color quantized palette for image fingerprinting. Comparisons are provide...
متن کاملPigment tests evaluated by a model of chromatic discrimination.
Clinical color-vision tests are evaluated within the framework of a model of chromatic discrimination in terms of cone excitation. The motivation for this study was to derive a method for evaluation of test design, test sensitivity, and observer performance. The discrimination model is based on the assumption that chromatic discrimination is mediated in two independent channels, one for short-w...
متن کاملSpatial and temporal chromatic contrast: Effects on chromatic discrimination for stimuli varying in L- and M-cone excitation.
Discrimination for equiluminant chromatic stimuli that vary in L- and M-cone excitation depends on the chromaticity difference between the test field and the surrounding area. The current study investigated the effect of the proximity in space and time of a surround to the test field on chromatic contrast discrimination. The experimental paradigm isolated spatial, temporal, and spatial-and-temp...
متن کاملChromatic and luminance signals in visual memory.
The efficiency of chromatic and luminance signals was studied in a set of tasks requiring the discrimination of two colors. Discrimination was measured around an adapting achromatic light and a number of other points in a three-dimensional color space. As a baseline, discrimination thresholds were measured under conditions permitting a side-by-side comparison of stimuli in space or time. For th...
متن کاملChromatic discrimination of natural objects.
Studies of chromatic discrimination are typically based on homogeneously colored patches. Surfaces of natural objects, however, cannot be characterized by a single color. Instead, they have a chromatic texture, that is, a distribution of different chromaticities. Here we study chromatic discrimination for natural images and synthetic stimuli with a distribution of different chromaticities under...
متن کامل