Title :
A requantization-based method for recompressing JPEG images
Author :
Bauschke, H.H. ; Hamilton, C.H. ; Macklem, M.S. ; McMichael, J.S. ; Swart, N.R.
Author_Institution :
Department of Mathematics and Statistics, University of Guelph, Ontario N1G 2W1, Canada
Abstract :
We propose a new method for requantizing JPEG images, based on the well-known Laplacian distribution of the AC discrete cosine transform (DCT) coefficients and on an analysis of the error introduced by requantization. The resulting images have improved perceptual image quality over a “blind” requantization approach, that is, one that does not consider the properties of the quantization matrices.
Keywords :
Laplace equations;
Conference_Titel :
Acoustics, Speech, and Signal Processing (ICASSP), 2002 IEEE International Conference on
Conference_Location :
Orlando, FL, USA
Print_ISBN :
0-7803-7402-9
DOI :
10.1109/ICASSP.2002.5745152
