Title :
A modified hybrid DCT-SVD image-coding system for color image
Author :
Wongsawat, Y. ; Ochoa, H. ; Rao, K.R. ; Oraintara, S.
Author_Institution :
Dept. of Electr. Eng., Texas Univ., Arlington, TX, USA
Abstract :
We propose a modified hybrid DCT-SVD image-coding system (MHDCTSVD) to encode both monochromatic and color images. The color (RGB) components are transformed into YCbCr. Cb and Cr components are downsampled by a factor of two along both the horizontal and vertical directions. The standard deviation of 8×8 blocks of the Y component is used to select between DCT and SVD. The DCT is used to transform the highly correlated blocks of the YCbCr components, while the SVD is used to transform blocks with low correlation. The simulation results show good image quality at low bit rates compared with the conventional hybrid DCT-SVD image-coding algorithm.
Keywords :
discrete cosine transforms; image coding; image colour analysis; image sampling; singular value decomposition; color components; color images; discrete cosine transforms; downsampling; image quality; modified hybrid DCT-SVD image-coding system; monochromatic images; singular value decomposition; standard deviation; Bit rate; Color; Discrete cosine transforms; Eigenvalues and eigenfunctions; Electronic mail; Image coding; Image quality; Vector quantization; Video compression; Videoconference;
Conference_Titel :
Communications and Information Technology, 2004. ISCIT 2004. IEEE International Symposium on
Print_ISBN :
0-7803-8593-4
DOI :
10.1109/ISCIT.2004.1413819
