A Modified JPEG-LS Image Compression Scheme for Low Bit-Rate Application

An image compression algorithm using JPEG-LS and cubic spline interpolation (CSI) is presented in this paper. The CSI is developed in order to subsample image data with minimal distortion and to achieve image compression. It has been shown in literatures that the CSI can be combined with the transform-based image compression algorithm to develop a modified image compression codec. The compression ratio obtained from the modified codec is higher than which obtained from the standard transform-based codec at similar subjective quality of reconstructed image. This paper proposes a compression scheme which combines the CSI and JPEG-LS to form the modified JPEG-LS codec and further makes use of this modified codec to image compression. Experimental results show that the compression ratio of proposed scheme has been increased over 3 times higher than the compression ratio of original JPEG-LS image compression standard with similar visual quality. The proposed scheme reduces the loading of storing and transmission of image.