DYNAMIC REGIONS OF INTEREST TRANSCODING FOR JPEG2000 BASED ON EBCOT AND LRCP PROGRESSION

This paper presents an efficient dynamic regions of interest (ROIs) transcoding scheme for JPEG2000. ROIs transcoding technique is specially value for image transmission with JPEG2000 through narrowband networks. Based on embedded block coding with optimal truncation (EBCOT), we obtain the original bitstream for the ROIs transcoding. Then, we can reorganize it without any re-encoding by using the empty packet property and Layer-Resolution-Component-Position (LRCP) progression of JPEG2000. The proposed scheme can effectively satisfy the user's needs of the dynamic definition as well as prioritization of new and existing ROIs quickly at any time during image transmission. Experimental results show that the scheme is not only highly flexible in the progressive transmission of JPEG2000 images, but also fast and easy to implement. Moreover, the proposed algorithm is fully compatible with the JPEG2000 image-coding standard, so it is also suitable for lossless transcoding of ROIs only or of the entire image.