Title :
Memory efficient quadtree wavelet coding for compound images
Author :
Cosman, Pamela ; Frajka, Tamás ; Schilling, Dirck ; Zeger, Kenneth
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA
Abstract :
Wavelet-based image coders generally perform well on natural images, which are typically characterized by slowly varying image intensities. Their performance suffers, however on compound images containing both text and image data. We modify a quadtree wavelet coder to perform well on text image data by treating text blocks differently from non-text blocks. We combine wavelet domain processing of non-text blocks with spatial domain processing of text blocks, and achieve improved performance over purely wavelet domain techniques for compound images.
Keywords :
image coding; quadtrees; transform coding; wavelet transforms; Memory efficient quadtree wavelet coding; compound images; image coding; image data; non-text blocks; spatial domain processing; text blocks; text data; wavelet domain processing; Classification tree analysis; Decision trees; Discrete cosine transforms; Drives; Frequency; Humans; Image coding; Image segmentation; Pixel; Wavelet domain;
Conference_Titel :
Signals, Systems, and Computers, 1999. Conference Record of the Thirty-Third Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-5700-0
DOI :
10.1109/ACSSC.1999.831892
