Fast block prediction-based coding of compound images by exploiting edge orientation
by S. Ebenezer Juliet; V. Sadasivam; D. Jemi Florinabel
International Journal of Signal and Imaging Systems Engineering (IJSISE), Vol. 6, No. 2, 2013

Abstract: Compound images are a combination of text, graphics and natural images. This paper presents a new fast block prediction algorithm for coding of text/graphics parts which exploits the direction of edges in the text/graphics blocks. The proposed scheme classifies the text/graphics blocks into four kinds of blocks using edge characteristics of transformed coefficients of blocks. This edge-based block classification improves the speed of intra-block prediction mode decisions significantly. Experimental results show that the proposed method improves the value of PSNR more significantly than standard JPEG, JPEG-2000 and H.264/AVC-I, while keeping competitive compression ratio and visually lossless quality of text information.

Online publication date: Sun, 21-Apr-2013

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