Title :
Encoding the location of spectral coefficients using quadtrees in transform image compression
Author :
Baskurt, Atilla ; Goutte, Robert
Author_Institution :
Lab. de Traitement du Signal et Ultrasons, CNRS, Villeurbanne, France
Abstract :
A transform image coding method is presented. A discrete cosine transform (DCT) is performed on blocks of 16×16 size. A threshold mask is applied by using a fixed threshold determined by the statistical properties of the DCT coefficients. Selected coefficients are coded with a Huffman code. Three methods for coding the threshold mask are compared. zigzag, orthogonal, and quadtree scan. Three Huffman code tables are presented for coding the runlengths of zeros. A high-quality decoded image is shown at 1 bit/pixel
Keywords :
data compression; encoding; picture processing; transforms; DCT coefficients; Huffman code; discrete cosine transform; encoding; high-quality decoded image; image coding; orthogonal coding; quadtree scan coding; spectral coefficients location; statistical properties; threshold mask; transform image compression; zigzag coding; Decoding; Discrete cosine transforms; Frequency; Image coding; Pixel; Quantization;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1989. ICASSP-89., 1989 International Conference on
Conference_Location :
Glasgow
DOI :
10.1109/ICASSP.1989.266811
