【摘要】 为了减少小波变换的运算量,且当图像尺寸增大时,相应的运算量急剧增大的情况,提出了一种新的压缩算法。该算法首先利用图像的局部相似性和仿射关系构建碎片库,然后对碎片库进行小波变换压缩;仿真实验表明,碎片库所含像素点数远少于图像像素点数,且碎片库尺寸并不随图像尺寸的增大而明显增大。该算法有效提高了压缩率,减少了小波变换的运算量。更多还原

【Abstract】 In order to decrease the amount of computation of wavelet transform,which increase dramatically as image size enlarges,a new method of image compression is proposed.Firstly a fraction bank of image is constructed based on image area similarity and subblock reflection.Then use wavelet to transform the fraction bank.According to output of experiments,pixels in fraction bank is far less than in original image,and the size of fraction bank is not enlarges at the same step as the size of original image enlarges.The introduced compression algorithm not only lifts compression rate,but also decreases the amount of computation of wavelet transform.更多还原