Image blockiness evaluation based on Sobel operator

This paper presents a novel no-reference image blockiness index which exploits the properties of the Sobel operator. The blockiness index is a combination of two measures. The first quantifies the luminance variation of block boundaries pixels. The second quantifies the luminance variation of remaining pixels. Experimental results illustrating the performance of the proposed method show improvements over similar recently published methods.

[1]  Jerome R. Cox,et al.  Experimental evaluation of psychophysical distortion metrics for JPEG-encoded images , 1995, J. Electronic Imaging.

[2]  Stefan Winkler,et al.  Perceptual Video Quality and Blockiness Metrics for Multimedia Streaming Applications , 2001 .

[3]  Thierry Eude,et al.  An evaluation of quality metrics for compressed images based on human visual sensitivity , 1998, ICSP '98. 1998 Fourth International Conference on Signal Processing (Cat. No.98TH8344).

[4]  Andrew P. Bradley,et al.  Perceptual quality metrics applied to still image compression , 1998, Signal Process..

[5]  Stefan Winkler,et al.  Video Quality Experts Group: current results and future directions , 2000, Visual Communications and Image Processing.

[6]  Albert J. Ahumada,et al.  Computational image quality metrics: A review , 1993 .

[7]  Ahmet M. Eskicioglu,et al.  Quality measurement for monochrome compressed images in the past 25 years , 2000, 2000 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.00CH37100).

[8]  Lina J. Karam,et al.  Adaptive image coding with perceptual distortion control , 2002, IEEE Trans. Image Process..

[9]  V. Ralph Algazi,et al.  Objective picture quality scale (PQS) for image coding , 1998, IEEE Trans. Commun..

[10]  Zhenghua Yu,et al.  Vision-model-based impairment metric to evaluate blocking artifacts in digital video , 2002, Proc. IEEE.

[11]  Paul S. Fisher,et al.  Image quality measures and their performance , 1995, IEEE Trans. Commun..

[12]  Murat Kunt,et al.  Vision and Video: Models and Applications , 2001 .

[13]  Zhou Wang,et al.  No-reference perceptual quality assessment of JPEG compressed images , 2002, Proceedings. International Conference on Image Processing.

[14]  Zhou Wang,et al.  Blind measurement of blocking artifacts in images , 2000, Proceedings 2000 International Conference on Image Processing (Cat. No.00CH37101).

[15]  T. Vlachos,et al.  Detection of blocking artifacts in compressed video , 2000 .

[16]  Sugato Chakravarty,et al.  Methodology for the subjective assessment of the quality of television pictures , 1995 .

[17]  Alan C. Bovik,et al.  . Efficient DCT-domain blind measurement and reduction of blocking artifacts , 2002, IEEE Trans. Circuits Syst. Video Technol..