Applied Mathematics & Information Sciences

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A deblocking scheme with orthogonal polynomials transform coefficients that reduces the blocking artifact in JPEG compressed images is presented in this paper. The proposed deblocking scheme first measures the amount of artifact present in the blocks with step function and image gradient and produces an artifact measurement factor. The proposed artifact reduction scheme aims to reduce the artifact by converting the step function into a ramp function adaptively. Consecutive blocks of the image are considered and applied with orthogonal polynomials transformation and independently two identity matrices are considered and subjected to orthogonal polynomials transformation and combined with consecutive blocks to produce a shifted block. This shifted block is processed with the proposed blocking artifact reduction technique with linearization into ramp function and updated block is obtained with reduced blocking artifacts. The proposed deblocking technique is experimented with standard bench mark images and performance is measured with standard PSNR. The results are encouraging.

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