An improved shape-based arbitrary shape ROI coding method with SA-DWT in JPEG2000

The JPEG2000 image coding standard supports two region-of-interest (ROI) coding methods: the maximum shift (Maxshift) method and the general scaling based method. This paper extends the general scaling based method of JPEG2000, and presents an effective ROI coding method based on shape coding with shape-adaptive discrete wavelet transforms (SA-DWT) applied to the arbitrary shape ROI and background respectively. The proposed method not only allows the coding of multiple arbitrary shape ROI, but also the image quality of ROI boundary will not decrease for the wavelet coefficients shifting of background. Coding results illustrate the performance of the proposed coding method.