Title :
Adaptive subsampling for image data compression
Author_Institution :
Canberra Univ., ACT, Australia
Abstract :
Describes a two-to-one subsampler which allows an image to be transmitted in a layered format. Subsampling can be made adaptive to local activities of the image by using gradient measurements. Simulation results show that, for a typical outdoor scene, the picture quality in terms of the PSNR ranges from about 50 dB at 10% to 30 dB at 95% of the blocks of the image being subsampled. The DCT coefficients of the low-pass subsampled output remain highly compacted, so that further data reduction is possible.<>
Keywords :
data compression; discrete cosine transforms; image coding; 2-to-1 subsampler; DCT coefficients; adaptive subsampling; data reduction; discrete cosine transform; gradient measurements; image data compression; image transmission; layered format; local activities; low-pass subsampled output; outdoor scene; picture quality; picture signal-to-noise ratio; simulation; Data compression; Discrete cosine transforms; Image coding; Image reconstruction; Image resolution; Layout; Local activities; PSNR; Spatial resolution; Transmitters;
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.1993.320167
