基于JPEG2000的感兴趣区域编码新算法

提出了一种新的JPEG2000感兴趣区域编码算法。该算法先将感兴趣区域(ROI)在时域进行提升、周期延拓处理并叠加到背景区域像素值上,然后利用小波变换的可加性将小波变换后的背景区域系数减去相应的感兴趣区域系数,最后在接收端通过相应的处理实现ROI恢复。实验结果表明:该算法性能优越,计算量小且易于实现,在相同压缩率条件下,改善了由ROI时域提升算法产生的ROI边缘模糊的缺点,更有益于接收端对感兴趣区域的理解。

New coding method for ROI based on JPEG2000

A new coding method based on JPEG2000 for Region of Interesting(ROI) was proposed.In this method the pixel value of the ROI was up-scaled in time domain and periodically extended;afterward it was added to the pixel value of background(BG) .Then based on the additive characteristics of wavelet transform,the BG wavelet transform coefficients were used to subtract the corresponding ROI coefficients after wavelet transform.The image was reconstructed in the receiver through the corresponding process.The new method has low computational complexity and eliminates the shortcoming of edge blurring produced by time domain up-scaling method.Experimental results demonstrate the advantage of the new method.At the same compression rate,the subjective image quality of the new method is better than that of time domain up-scaling method and the new method facilitates the receiver to understand the ROI.