For this problem, this paper takes the place of JPEG2000 wavelet transforms with Shape-Adaptive Discrete Wavelet Transforms. The method largely improves the image quality of ROI boundary.

• 针对这个缺点,本文应用形状自适应离散小波变换(SA-DWT)代替JPEG2000所用的小波变换,使得感兴趣区域的边缘图像质量有了较大的提高。