Hatching is a shading technique in which tone is represented by a series of strokes or lines. Drawing using this technique should follow three criteria: the lighting, the object geometry and its material. These criteria respectively provide tone, geometric motif orientation and geometric motif style. We present a GPU real time approach of hatching strokes over arbitrary surfaces. Our method is ...

General relativity is notoriously difficult to interpret. A "return to the mothers" is proposed to better understand the gothic-R theorem of the Schwarzschild metric of general relativity. It is shown that the new finding is already implicit in Einstein's equivalence principle of 1907 and hence in special relativity (with acceleration). The TeLeMaCh theorem, named onomatopoetically after Telema...

Algorithms for classification of 3D objects either recover the depth information lost during imaging using multiple images, structured lighting, image cues, etc. or work directly the images for classification. While the latter class of algorithms are more efficient and robust in comparison, they are less accurate due to the lack of depth information. We propose the use of structured lighting pa...

The performances of the current face recognition systems suffer heavily from the variations in lighting. To deal with this problem, this paper presents an illumination normalization approach by relighting face images to a canonical illumination based on the harmonic images model. Benefiting from the observations that human faces share similar shape, and the albedos of the face surfaces are quas...

The appearance of bread, such as colour and visual texture are important to the consumer when purchasing bread. The perceived colour of bread is a function of its solid-phase crumb, air-phase and viewing conditions, varying with age and ambient lighting. Visual texture aspects include the alignment of fibres with respect to the axis of view and the distribution of small fat regions in both phas...

In this paper, a novel approach to non-rigid moving object detection under varying chromatic illumination is proposed. Different from most algorithms that utilize color information, the assumption of smooth or global change of illumination is no longer needed. Our method is based on the observation that the color appearance of objects may alter as the change of light intensity and color, but th...

As cheap and powerful 3D render engines become commonplace, demand for nearly realistic 3D scenes is increasing. Besides more detailed geometric and texture information, this presupposes the ability to map dynamic textures. This is obviously needed to model movies, computer and TV screens, but also for example the landscape as seen from inside a moving vehicle, or shadow and lighting effects th...