persian manuscripts were produced during the second century until the forth one in iran. iranians had experiences about painting in pre-islamic era, so they played an important role in creating art works such as miniature, illuminated pages in islamic civilization after the emergence of islam. in the first centuries of emerging islam, beautiful transcription, ornamentation of quran were honors ...

Light source animation is a particularly hard field of real-time global illumination algorithms since moving light sources result in drastic illumination changes and make coherence techniques less effective. However, the animation of small (point-like) light sources represents a special but practically very important case, for which the reuse of the results of other frames is possible. This pap...

We present an algorithm which uses information from both surface reflectance and illumination variation to solve for colour constancy. Most colour constancy algorithms assume that the illumination across a scene is constant, but this is very often not valid for real images. The method presented in this work identifies and removes the illumination variation, and in addition uses the variation to...

It is shown that both changes in viewing position and illumination conditions can be compensated for, prior to recognition, using combinations of images taken from di erent viewing positions and di erent illumination conditions. It is also shown that, in agreement with psychophysical ndings, the computation requires at least a sign{bit image as input | contours alone are not su cient.

The image irradiance of a three-dimensional object is known to be the function of three components: the distribution of light sources, the shape, and reflectance of a real object surface. In the past, recovering the shape and reflectance of an object surface from the recorded image brightness has been intensively investigated. On the other hand, there has been little progress in recovering illu...

A prototype reflective spatial light modulator (SLM) system has been developed for writing megabit pages of data into a holographic medium at a rate of 12 pages per minute. The SLM is based upon a crystalline-silicon reflective active-matrix array with integrated data drivers, using liquid crystal (LC) electrooptics and a personal computer system with an interface to provide data. The LC has be...