Optimization of frequency Filtering in Random Access JPEG Library

In the paper we present a method of direct access to single blocks of JPEG files which contain textures, with on-the-fly decompression. Anisotropic, adaptive filtering is applied in order to minimize visual defects appearing mainly on blocks borders. Main purpose of the method is to enable fast extraction of only these parts of an entire image which are currently needed and not to keep whole decompressed texture in the main memory. This approach enables effective usage of high quality textures with low memory consumption. It’s benefits are mainly demonstrated in rendering complex 3D scenes using nondeterministic ray-tracing algorithm. The algorithms have been encapsulated into DLL and static library.