Directional Gaussian filter with variable filtering strength and variable window size for deblocking digital images
Shanty Chacko, J. Earnest Jayakumar · International Journal of Information and Communication Technology · 2015
When a digital image is compressed at high compression ratio, visual quality of the image is affected because of the formation of compression artefacts. Blocking artefact and ringing artefact are the two major compression artefacts. In this paper, a new filtering technique is proposed to remove the blocking and the ringing artefacts from the compressed digital images. In the proposed method, a Gaussian type filter is used with variable filtering strength based on the information content in the image. For the filtering, window size of (1 × N) is used where N is a variable depending on the activities in the region. The filter is applied horizontally, vertically, along 45L and along 135L. The quality of the artefacts removed images are compared with other similar techniques. The results show that the proposed method outperforms other methods.