影像技术
影像技術
영상기술
IMAGE TECHNOLOGY
2015年
3期
50-53
,共4页
分形%图像熵%SPIHT%遥感影像压缩
分形%圖像熵%SPIHT%遙感影像壓縮
분형%도상적%SPIHT%요감영상압축
Fractal%Image Entropy%SPIHT%Remote Image Compression
为了进一步提高遥感影像的编解码效率和重构影像的质量,对分形编码和SPIHT算法进行优化组合,提出一种基于图像熵的分形与改进的SPIHT算法相结合的图像压缩方法。对小波分解后的低频子带进行基于图像熵的快速分形编码,以减少编解码时间;对包含图像细节边缘信息的高频子带进行改进的SPIHT编码,通过二次小波分解和设置阈值,以减少算法的复杂度,提高重构图像的峰值信噪比。实验表明该算法具有很好的有效性和可行性。
為瞭進一步提高遙感影像的編解碼效率和重構影像的質量,對分形編碼和SPIHT算法進行優化組閤,提齣一種基于圖像熵的分形與改進的SPIHT算法相結閤的圖像壓縮方法。對小波分解後的低頻子帶進行基于圖像熵的快速分形編碼,以減少編解碼時間;對包含圖像細節邊緣信息的高頻子帶進行改進的SPIHT編碼,通過二次小波分解和設置閾值,以減少算法的複雜度,提高重構圖像的峰值信譟比。實驗錶明該算法具有很好的有效性和可行性。
위료진일보제고요감영상적편해마효솔화중구영상적질량,대분형편마화SPIHT산법진행우화조합,제출일충기우도상적적분형여개진적SPIHT산법상결합적도상압축방법。대소파분해후적저빈자대진행기우도상적적쾌속분형편마,이감소편해마시간;대포함도상세절변연신식적고빈자대진행개진적SPIHT편마,통과이차소파분해화설치역치,이감소산법적복잡도,제고중구도상적봉치신조비。실험표명해산법구유흔호적유효성화가행성。
In order to improve remote image coding, to enhance the quality of reconstructed image, the optimum combination of fractal coding and SPIHT. An image coding method based on the merits of improved SPIHT and image entropy fractal image compression technology is proposed. The low-frequency area after wavelet decomposition is factual coded based on image entropy to shorten coding time. The high-frequency ones including detail information of image are coded by improved SPIHT, which decomposes wavelet again and sets the threshold to reduce its complexity and improve the PSNR of reconstructed image.Experiments show that this new method is effective and feasible.