LOCALIZATION OF DOMINANT POINTS FOR IMAGE-CODING

In this letter, a modified dominant point detection algorithm is devel oped and applied for Interpolative Vector Quantization (IVQ) of images . The algorithm employs an optimal discontinuity detector to locate fi rst order discontinuities which efficiently characterizes a scan line. Using the detected first order discontinuities as the initial guess, the final set of interpolating points is obtained using a Modified Spl it-&-Merge algorithm. Experimental results show that, under the same b it-rate, an average of 0.5 dB improvement is achieved by our proposed method when compared with the results obtained by the traditional IVQ in terms of Peak Signal-to-Noise Ratio (PSNR).