Title :
Discrete cosine transform on irregular shape for image coding
Author :
Bi Mi ; Cham Wai Kuen ; Zheng Zhi Hang
Author_Institution :
Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Shatin, Hong Kong
Abstract :
Segmentation-based image coding methods yield improved image quality over block-based schemes at high compression ratio. The paper presents a transform scheme on irregular shaped image segments based on the DCT for the purpose of image coding. The 2-dimensional transform is carried out in the horizontal and vertical directions separately. The alignment of the coefficients after the first 1-dimensional transform is studied and a table-look-up method for the best alignment is proposed with which the correlation between different rows after the first 1D transform can be exploited to its maximum.<>
Keywords :
discrete cosine transforms; image coding; image segmentation; table lookup; 1D transform; 2D transform; DCT; correlation; horizontal direction; image quality; irregular shape; irregular shaped image segments; segmentation-based image coding methods; table-look-up method; transform scheme; vertical direction; Bismuth; Bit rate; Data compression; Discrete cosine transforms; Image coding; Image quality; Image segmentation; Shape; Transform coding; Video codecs;
Conference_Titel :
TENCON '93. Proceedings. Computer, Communication, Control and Power Engineering.1993 IEEE Region 10 Conference on
Conference_Location :
Beijing, China
Print_ISBN :
0-7803-1233-3
DOI :
10.1109/TENCON.1993.328008
