Efficient ROI schemes considering size of code-block in JPEG2000 coding

摘要

Two methods for improvement of image-quality in JPEG2OOO coding with ROI (Regions of Interest) are proposed in this paper. In JPFG2O00, there is a coding unit refered to code-block. We show that it is a problem that the relationship between this code-block and the ROI region are influential in image-quality. Then we propose two methods to improve the problem. One is a method which specify the ROI region with consideration to the code-block size, the other is a method which selects the frequency-band in the DWT domain to be applied to ROI. The both proposed methods not only improve the deterioration of image-quality, but also they are capable of decoding with the standard JP2 Part-1 decoder. Finally, we provide some simulations to verify the effectiveness of the proposed methods.