Many image and video compression schemes perform the discrete cosine transform (DCT) to represent image data in frequency space. An analysis of a broad suite of images confirms previous findings that a Laplacian distribution can be used to model the luminance ac coefficients. This model is expanded and applied to color space (Cr/Cb) coefficients. In MPEG, the DCT is used to code interframe prediction error terms. The distribution of these coefficients is explored. Finally, the distribution model is applied to improve dynamic generation of quantization matrices.
DCT coefficient distributions
Human Vision and Electronic Imaging ; 1996 ; San Jose,CA,United States
Proc. SPIE ; 2657
1996-04-22
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
DCT coefficient distributions [2657-46]
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