At the same time , the main advantage of the encoding method , which can allow a target bit rate to be met exactly , is that the encoder can stop encoding at any point 另外,本方案还有一个明显的优点就是可以在任意一点结束编解码,从而可以根据对重构图象质量的要求动态调整压缩比。
Experiment results shows that the recovered document image compressed with this method has a higher visual quality over the standard jpeg method under the same compression ratio 实验结果表明,本文方法与标准jpeg压缩方法相比,在相同压缩比的情况下,重构图像质量明显优于标准jpeg压缩方法。
Not only from direct scanning images but from reconstruction images , we could see that the movement of sublimation interface was a three - dimensional move mode , it contracted to the centre of the material 从直接扫描图像和重构图像,均可看到升华界面的移动是一个立体的移动,由它所包裹的冻结区逐渐向物料几何中心收缩。
In this technique , an image is usually represented by a contractive affine transformation , for which the reconstructed image is its fixed point and approximate to the original image . the fractal code of the image consists of the parameters of the contractive transformation 在分形编码中,一幅图像由一个使它近似不变的压缩仿射变换表示,重构图像是压缩变换的不动点,压缩仿射变换的参数组成原始图像的分形码。
2 ) the embedded zero - tree wavelet algorithm , which is proposed by shapiro , is analyzed . regarding to its shortcomings , a new quantization method based on zero - tree is presented . in addition , this method needs to match the hvs characteristics 2 )仔细分析了shapiro的嵌入式零树编码算法,根据其在量化过程中存在的问题,提出了一种改进的零树量化算法,并在量化过程中充分考虑了人的视觉特性对于重构图象质量的影响。