Perceptually tuned subband coder with region of interest

At high compression, various artifacts such as blurring and blocking are common in JPEG images. In this paper, a perceptually tuned subband coder based on the subband discrete cosine transform (SBDCT) is discussed. At the same bit rate, the compressed images from our proposed coder are visually better than JPEG images. In [5], simple schemes of computation and distortion scalability are introduced in our coder. In this paper, an updated implementation of [5] which consists of lower memory requirement and ROI coding are discussed.