engleski

DCTlab

The use of educational software is widely recommended as a complementary tool in image systems engineering education. The applications of imaging are numerous and include manufacturing, entertainment, remote sensing, publishing, interactive services, multimedia and the transfer of image data over communication lines. In many systems compression of image data should be used for efficient storage and transmission. Current standards for the compression of still and moving images use Discrete Cosine Transform (DCT) which represents an image as a superposition of cosine functions with different discrete frequencies. Students and engineers specializing in image and video systems engineering need to understand why DCT is necessary and to understand the influence of DCT based image compression on picture quality. Therefore, educational software "DCTlab" for the analysis of DCT application in image compression systems is developed. DCTlab is a library of MATLAB routines for DCT image compression with graphical user interface. DCTlab will help you to understand how DCT works in image compression system making sure that picture fits the system or conversely that system can handle the picture. You can learn how to select compression parameters for specific application or image type and how to assess or measure picture quality to make sure that all the parts fit.

Discrete Cosine Transform; Block Size; Image Compression; PSNR; PQS

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