Kadi Bouatouch

ATIP: A Tool for 3D Navigation inside a Single Image with Automatic Camera Calibration

Automatic Tour Into the Picture (ATIP) is an extension of the Tour Into the Pic ture method [ HAA97] that allows an approximative but visually convincing 3D walk-through inside a single ima ge by rendering a box textured using the input image data. The original algorithm requires a long and tedious use r int raction to determine the box dimensions and the perspective parameters, and imposes several con straints on the input image orientation. The goal of this paper is to present a framework providing fully automatic and fas t c mera calibration for any view orientation without using a calibration target. Our method reduces the user in t action, hence only a couple of seconds are required between the input image loading and the final walkthrough.

Rendering grass terrains in real-time with dynamic lighting

We present a new approach to the rendering of realistic grass fields in real-time with dynamic lighting, shadows, antialiasing, animation and density management. We propose a method with three levels of detail, chosen depending on the distance from the camera: geometry rendering, volume rendering with per pixel lighting, rendering of 2D texture map with per pixel lighting. Usually, due to the expensive computations required to render large amounts of geometry for the grass blades, coarse approximations such as modeling using billboards are used in practice. Our approach, however, allows rendering of very detailed grass with shadows in close proximity from the viewer, and far grass with per pixel lighting and with a convincing parallax effect. Our method is based on the instancing of a patch of grass along a terrain, but does not exhibit repetitive patterns due to our simple aperiodic tiling scheme. Our management of grass density allows the rendering of grass patches of arbitrary shape at any distance from the camera and seamless transitions between the levels of detail. ! #

METHOD FOR TONE-MAPPING A VIDEO SEQUENCE

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