基于JPEG2000的感兴趣区域压缩编码算法

提出一种基于JPEG2000感兴趣区域的图像压缩方法.该方法首先提取出感兴趣区域;然后为达到重要信息不丢失的前提下增大压缩率的目的,对不同区域采用不同压缩率,即对感兴趣区域进行低倍率有损压缩,对背景区域进行高倍率有损压缩;最后通过计算均方误差(mean squared error,MSE)和峰值信噪比(peak signal to noise ratio,PSNR),对该方法进行客观评价.实验结果表明:基于ROI的压缩方法的性能优于一般压缩方法,在获得更高压缩率的前提下,压缩重构图像保持了较高的峰值信噪比,较好地解决了压缩率和图像质量之间的矛盾.

Image compression coding algorithm of ROI based on JPEG2000

An image compression method of the interest region based on JPEG2000 was designed. Firstly, the regions of interest（ROI） were extracted, and then the different regions were compressed using different compression rates that low compression rate was used for regions of interest and high compression rate was used for the background in order to reach the goal of increasing compression ratio without losing important information; finally, the method were objectively evaluat- ed using mean squared error （MSE） and peak signal to noise ratio （PSNR）. Experimental results show that the quality of image compression method based on regions of interest is better than the general compression method. Under the premise of getting a higher compression ratio, the reconstructed compressed image maintains higher peak signal to noise ratio （PSNR）, so the method solves the contradiction problem between the comoression ratio and the imaze oualitv.