document: Design of high-performance wavelets for image coding using a perceptual time domain criterion This paper presents a new biorthogonal linear-phase wavelet design for image compression . Instead of calculating the prototype filters as spectral factors of a half-band filter , the design is based on the direct optimization of the low pass analysis filter using an objective function directly related to a perceptual criterion for image compression . This function is defined as the product of the theoretical coding gain and an index called the peak-to-peak ratio , which was shown to have high correlation with perceptual quality . A distinctive feature of the proposed technique is a procedure by which , given a `` good '' starting filter , `` good '' filters of longer lengths are generated . The results are excellent , showing a clear improvement in perceptual image quality . Also , we devised a criterion for constraining the coefficients of the filters in order to design wavelets with minimum ringing
doc_bio_tags: O O O O O B I O O B I I I O O O O O O O O O O B I O O O O O B I O O O O O O O O O O O O O O O O O O O O B I O O B I O O O O O O O B I O O O O O O O O O O O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I I O O O O O O O O O O O O O O O O O O O O O O
extractive_keyphrases: image coding perceptual time domain criterion image compression prototype filters analysis filter objective function coding gain perceptual image quality
abstractive_keyphrases: high-performance wavelets biorthogonal linear-phase wavelet design half-band filter low pass filter peak-to-peak ratio filter banks