A Regularized Image Restoration Algorithm for Lossy Compression in Astronomy |
| |
Authors: | Yves Bobichon Albert Bijaoui |
| |
Institution: | (1) Observatoire de la Côte d'Azur Dpt CERGA URA CNRS, 1360 Boulevard de l'observatoire B.P. 4229, 06304 Nice Cedex 4 -, France |
| |
Abstract: | Astronomical images currently provide large amounts of data. Lossy compression algorithms have recently been developed for high compression ratios. These compression technique introduce distortion in the compressed images and for high compression ratios, a blocking effect appears. We propose a modified compression algorithm based on the hcompress scheme, and we introduce a new decompression method based on the regularization theory The image is restored scale by scale in a multiresolution scheme and the information lost during the compression is recovered by applying a Tikhonov regularization constraint. The experimental results show that the blocking effect is reduced and some measurements made on a simulated image show that the astrometric and the photometric properties of the restored images are improved. |
| |
Keywords: | Image compression multiresolution regularization constraint image restoration |
本文献已被 SpringerLink 等数据库收录! |