SAR復(fù)圖像數(shù)據(jù)的CCSDS-IDC編碼性能分析與四叉樹編碼
[Abstract]:Objective CCSDS-IDC (International Spatial data system Advisory Committee-Image data Compression) is a standard for spatial image data compression based on discrete wavelet transform (DWT) scale attenuation. It is suitable for the compression of synthetic Aperture Radar (SAR) amplitude images and all kinds of remote sensing images. However, unlike optical images, the common SAR images are complex image data, which are widely used in many occasions such as interferometric altimetry. It is of great value to analyze and study the encoding performance of CCSDSIDC for SAR complex image data. Methods because SAR complex image data do not have the attenuation between scales, the performance of SAR complex image data coding is low. Considering the clustering characteristics of discrete wavelet transform (DWT) coefficients of SAR complex image data, a quadtree (QC) is proposed to encode complex SAR image data in DWT domain. It is found that QC has high compression performance for SAR complex image data. Results the experimental results show that, under the same code rate, Compared with CCSDS-IDC, the maximum amplitude to noise ratio can be increased by 4.4 dB, and the average phase error can be reduced by 0.368, compared with CCSDS-IDC based on directional lifting wavelet transform (DLWT), the peak signal-to-noise ratio can be increased by 3.08 dB, and the average phase error can be reduced by using DWT-based CCSDS-IDC. Low average phase error 0. 25; for other types of image compression, QC based on clustering can still achieve good coding performance. Conclusion CCSDS-IDC has poor performance in SAR complex image coding, while QC can achieve good coding performance. Due to the inter-scale attenuation of image smoothing distribution, it may not exist in some special images, but the clustering property corresponding to image structure distribution always exists, so in the design of image coding algorithm based on DWT, Priority should be given to the clustering characteristics of wavelet coefficients in order to achieve efficient coding of more kinds of images.
【作者單位】: 西安交通大學(xué)電子與信息工程學(xué)院;高通公司圣地亞哥研究院;
【基金】:國家自然科學(xué)基金項目(61373113) 中央高校基本科研業(yè)務(wù)費專項資金項目(xjj2012023)
【分類號】:TN957.52
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