LADAR IN TELEVISION

摘要

This paper discusses three application areas for depth map creation using laser radar (LADAR); synthetic interocular distances (SIOD) and convergence, virtual set merging of live action and dynamic re-lighting of content in post. Any one of these applications brings considerable value to the video production process and each will be discussed in turn. Additionally, the problem of merging multiple LADAR views into an integrated model is discussed. Such large scale multi-view LADAR system are just now emerging and promise to create synthetic video environments more complex than dual cameras mixed with depth maps, resulting in the ability to adjust camera position via synthesis. SIOD creation makes use of a variant of synthetic apertures to simulate a camera array. Such synthetic apertures allows for post shoot adjustments in interocular distance and convergence. Artifacts created during synthesis are resolved using the high resolution depth map created by the LADAR in combination with localized image warping. Depth maps created during virtual set rasterization can be merged with LADAR depth maps of live action to resolve not only complex occlusion issues, but also to preserve the perceived depth integrity of live action objects. Live objects have depth and visually seam well. Re-lighting makes use of LADAR depth maps to derive a normal map which can be used to change lighting after the shoot. This application of LADAR is most commonly used to match lighting between live action and background effects shots shots under different lighting conditions. Multiple LADAR viewpoints are valuable to reduce the effects of laser shadows, glancing angles, and limited complexity of a single view. Through the use of multi-view depth map capture, virtual stereoscopic cameras can be placed into the scene for post production adjustments of camera positions.