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High dynamic range (HDR) rendering is becoming an increasingly popular technique in computer graphics. Its challenge consists in mapping the resulting images’ large range of intensities to the much narrower ones of the display devices in a way that preserves contrastive details. Local tone mapping operators effectively perform the required compression by(More)
High dynamic range (HDR) imaging provides more physically accurate measurements of pixel intensities, but displaying them may require tone mapping as the dynamic range between image and display device can differ. Most tone-mapping operators (TMO) focus on luminance compression ignoring chromatic assets. The human visual system (HVS), however, alters color(More)
Afterimages comprise a common, recurring perceptual phenomenon experienced in a daily-basis. Afterimages are best realized when staring at some high intensity light source (i.e., a light bulb) and then shifting the ocular focus to other less luminous portions of the scene: a temporary “ghost” image of that strong intensity remains imprinted on the retina.(More)
Afterimages comprise a common, recurring perceptual phenomenon experienced on a daily basis. Afterimages are best realized when staring at some high-intensity light source (i.e., a light bulb) and then changing the fixation to other less luminous portions of the scene: a temporary “ghost” image of that strong intensity remains noticeable for a period of(More)
There is an increasing demand for high quality real time graphics nowadays. Shadows play an important role to the realism of computer-generated images, enhancing depth, curvature and localization senses. Due to their global nature, shadows introduce overwhelming complexity to rendering algorithms. Recently, screen-space ambient occlusion techniques started(More)
Rain is a common phenomena widely used in films, games, simulators and architectural design, in order to improve immersion or set mood. Rendering raindrops is a view-dependent problem and large quantities are required for plausible rainy scenes. Due to retinal persistence, falling raindrops are perceived as streaks, and many researchers aware of such have(More)
High dynamic range (HDR) imaging is becoming an increasingly popular practice in computer graphics, bringing unprecedented levels of realism to computer-generated imagery and rich detail preservation to photographs and films. HDR imagery can embrace more accurately the wide range of light intensities found in real scenes than its counterpart, low dynamic(More)
Non-photo realistic rendering (NPR) is an appealing subject in computer graphics with a wide array of applications. As opposed to photo realistic rendering, NPR focuses on highlighting features and artistic traits instead of physical accuracy. Photo mosaic generation is one of the most popular NPR techniques, where a single image is assembled from several(More)