Shifts in the appearance of color under different illuminant chromaticity are known to be incomplete, and fit nicely with a simple linear transformation of cone responses that aligns the achromatic points under two illuminants. Most chromaticity-transfer functions with von-Kries-like transformations use only one set of values to fit the color shifts from one illuminant to another. However, an a...

With recent and continued increases in computing power, and advances in the field of computer graphics, realistic augmented reality environments can now offer inexpensive and powerful solutions in a whole range of training, simulation and leisure applications. One key challenge to maintaining convincing augmentation, and therefore user immersion, is ensuring consistent illumination conditions b...

Under colored illumination, the achromatic point (the point in the chromaticity diagram seen as colorless) shifts toward the chromaticity of the illuminant. This investigation measured the loci of achromatic points for various intensities of a test field presented in a real rather than a simulated environment, lit by illuminants of various chromaticities. The achromatic point varied markedly wi...

As an image can convey more information than words, many people rely on them for communication. To establish the authenticity that the image is not a composite or spliced image, this paper proposes a new technique that detects the image forgery based on illuminant color estimation. The proposed system estimates illuminant color of the image and creates illuminant maps of human faces in images u...

UAbstract . There is a gradual increase in the number of composite pictures containing people. Due to the existence of such compositions, the trust in photographs is reduced. Due to the invention of powerful digital image editing tools, it has been so easy to manipulate images. Approaches that consider the illumination inconsistencies in digital images are of particular interest because a perfe...

Color matches between two small patches were made in a display containing ten larger regions of different chromaticities. The spatial organization of the ten regions was varied while keeping constant the immediate surround of each patch as well as the space-average chromaticity of the entire stimulus. Different spatial arrangements were designed to alter the perceptual organization inferred by ...

The veracity of claims made by researchers and clinicians when reporting the impact lighting on vision other biological mechanisms is, in part, reliant accurate valid measurement devices. We aim to quantify intra- inter-watch variability a commercially available light sensor device which has been widely used photobiological research. Intra- differences were investigated between four Actiwatch S...