Title :
Low bit rate subband DCT image compression
Author :
Wu, Yung-Gi ; Tai, Shen-Ghuan
Author_Institution :
Inst. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
fDate :
5/1/1997 12:00:00 AM
Abstract :
This paper describes two novel methods to improve the efficiency of subband coding by means of the energy compactness in the frequency domain. Our coding scheme applies a variable block size DCT to the subband signal to get a high coding efficiency. A class driven segmentation is devised as a variable block partition scheme. Besides, an information oriented coding strategy without side information is developed. The strategy not only retains the image properties but also reduces the computation overhead. Simulations are carried out to the Lena image, and their results show the effectiveness of the two approaches especially for low bit rate applications
Keywords :
channel capacity; discrete cosine transforms; image coding; image segmentation; transform coding; DCT image compression; Lena image; algorithm; class driven segmentation; computation overhead reduction; high coding efficiency; image properties; information oriented coding; low bit rate applications; low bit rate image compression; simulations; subband coding efficiency; subband signal; variable block partition scheme; variable block size DCT; Bit rate; Computational modeling; Degradation; Discrete cosine transforms; Filtering; Frequency domain analysis; Image coding; Image processing; Image segmentation; Quantization;
Journal_Title :
Consumer Electronics, IEEE Transactions on
