New progressive image transmission based on quadtree and shading approach with resolution control

Abstract

Employing the quadtree and Gouraud shading approach, this paper first presents a modified image compression method called the QSC. Then, based on the proposed compression method, a new progressive image transmission (PIT) scheme is presented. In the proposed PIT scheme, the encoding algorithm partitions all the quadtree nodes into several disjoint subsets such that the resolution of nodes in each subset must be in the specified interval. The decoding algorithm reconstructs the partitioned quadtree from coarse to the required quality stage by stage. Experimental results reveal that under the similar peak signal to noise ratio (PSNR) and bits per pixel (bpp), the proposed PIT scheme has a better feature-preserving capability when compared to the reduced-difference pyramid PIT scheme [Optic. Eng. 28 (7) (1989) 708] and the progressive JPEG [JPEB: Still Image Data Compression Standard, New York, 1993].