Image coding using Periodic Walsh Piecewise-Linear transform

The analysis of image coding using Periodic Walsh Piecewise-Linear (PWL) transform will be presented in this paper. The coding method employs an integer bit allocation scheme and Llyod-Max quantizers. Experimental results have shown that best results are obtained by modeling the DC coefficient using a one-sided Gaussian distribution and the AC coefficients by using a Laplacian distribution. Comparison of coding real images using the periodic Walsh piecewise-linear transform and some orthogonal transforms will be given. Computer simulation results indicate that the image coding efficiency of the periodic Walsh piecewise-linear transform is close to that of Walsh and Haar transforms from the PSNR viewpoint.