A DWT-based Deblocking Technique Based on Edge Detection and Zero Masking for Reducing Blocking Effect

Article type: Research Article

Authors: Tsai, Chwei-Shyong | Chang, Chin-Chen

Affiliations: Department of Information Management, National Taichung Institute of Technology, Taichung, Taiwan 404, R.O.C. | Department of Computer Science and Information Engineering National Chung Cheng University Chiayi, Taiwan, 621, R.O.C.

Abstract: To reduce blocking artifacts and enhance visual quality, a simple and efficient DWT-based technique is proposed for post-processing of block-based encoded images. Basically, the technique proposed in this paper removes the blocking artifacts that appear in smooth blocks within the DWT frequency domain. From the experimental results, we see that the proposed technique can easily and effectively remove the blocking artifacts as well as enhance the visual quality of an image. In addition, compared with some other current deblocking methods, the deblocked images created by using the proposed technique have higher PSNR.

Keywords: Blocking artifact, DWT, JPEG

Journal: Fundamenta Informaticae, vol. 58, no. 2, pp. 179-188, 2003