Title :
Design and evaluation of perceptual masks for wavelet image compression
Author :
Beegan, A.P. ; Iyer, L.R. ; Bell, A.E. ; Maher, V.R. ; Ross, M.A.
Author_Institution :
PanAmSat, Wilton, CT, USA
Abstract :
Transform-based image compression performance is measured quantitatively in terms of peak signal-to-noise ratio (PSNR); subjective quality is also important to evaluating performance. An image compression system that incorporates the sensitivities of the human visual system (HVS) can enhance performance. This paper develops new HVS techniques-in the form of perceptual weighting masks derived from the luminance contrast sensitivity function-and illustrates their performance for grayscale and color images using the biorthogonal 9/7 and 22/14 wavelet transforms. Performance is measured quantitatively and qualitatively using a subjective testing procedure with 15 observers. Our HVS methods improve both PSNR and subjective quality for color images; for grayscale images, PSNR values decrease and quality increases.
Keywords :
data compression; image coding; image colour analysis; image reconstruction; wavelet transforms; asymmetric compression; color images; grayscale images; human visual system; image reconstruction; luminance contrast sensitivity function; peak signal-to-noise ratio; perceptual masks; wavelet image compression; wavelet transforms; Color; Filters; Frequency; Gray-scale; Humans; Image coding; PSNR; Testing; Transform coding; Visual system;
Conference_Titel :
Digital Signal Processing Workshop, 2002 and the 2nd Signal Processing Education Workshop. Proceedings of 2002 IEEE 10th
Print_ISBN :
0-7803-8116-5
DOI :
10.1109/DSPWS.2002.1231082
