DocumentCode :
3266451
Title :
Compression of aerial ortho images based on image denoising
Author :
Langi, A. ; Kinsner, W.
Author_Institution :
Dept. of Electr. & Comput. Eng., Manitoba Univ., Winnipeg, Man., Canada
fYear :
1996
fDate :
Mar/Apr 1996
Firstpage :
446
Abstract :
Abstract only given. Discusses the compression of an important class of computer images, called aerial ortho images, that result from geodetic transformation computations [Kinsner, 1994]. The computations introduce numerical noise, making the images nearly incompressible losslessly because of their high entropy. The use of classical lossy compression schemes is also not desirable because their effects on the original image are unknown. We then propose the use of image denoising coupled with lossless image compression, that preserves selected image characteristics. Two denoising schemes for a compression ratio of 2:1 are compared. The first scheme is based on a Donoho´s (1992) wavelet shrinking scheme which preserves image smoothness. We study the effect of various shrinking parameter values on the compression ratio and image quality, where 35.5 dB peak signal-to-noise ratio (PSNR) is obtained for a compression ratio of 2.03:1. This approach preserves high-frequency information, so that sharp edges do not become blurred as in classical filtering methods. This is critically important, because the main feature of ortho images is in its flatness and its precision of edge position. The second scheme is based on preserving pixel predictability [Kostelich and Schreiber, 1993), leading to a variant of planar predictive coding. This approach adds, to the edge preserving capability, the limitation in pixel deviation between the original and denoised images to be within one grayscale level. As a result, two different predictive coding schemes achieve a compression ratio of 2:1 at 49.9 dB and 51.2 dB PSNR
Keywords :
data compression; image coding; optical noise; remote sensing; Donoho wavelet shrinking scheme; aerial ortho images; compression; compression ratio; edge position; flatness; geodetic transformation; image characteristics; image denoising; image quality; pixel predictability; planar predictive coding; smoothness; Entropy; Image coding; Image denoising; Image quality; Information filtering; Information filters; Noise reduction; PSNR; Pixel; Predictive coding;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Data Compression Conference, 1996. DCC '96. Proceedings
Conference_Location :
Snowbird, UT
ISSN :
1068-0314
Print_ISBN :
0-8186-7358-3
Type :
conf
DOI :
10.1109/DCC.1996.488378
Filename :
488378
Link To Document :
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