Computer graphics by Omar Waleed

We survey the techniques for image-based rendering. Unlike traditional 3D

computer graphics in which 3D geometry of the scene is known, image-based rendering

techniques render novel views directly from input images. Previous image-based

rendering techniques can be classified into three categories according to how much

geometric information is used: rendering without geometry, rendering with implicit

geometry )i.e., correspondence(, and rendering with explicit geometry )either with

approximate or accurate geometry(. The continuum between images and geometry used

in image-based rendering techniques suggests that image-based rendering with traditional

3D graphics can be united in a joint image and geometry space. Shadow is always being one of the most attractive subjects because of its

important role in the field of computer realistic graphics. In this paper, we survey two

commonly used types of shadow rendering algorithms: projection shadows and shadow

volumes. The basic ideas underlying the two types of algorithms are introduced and their

characters are discussed in details.