Discrete-time signal processing (2nd ed.)
Discrete-time signal processing (2nd ed.)
A single-ended blockiness measure for JPEG-Coded images
Signal Processing
DCT-domain blind measurement of blocking artifacts in DCT-coded images
ICASSP '01 Proceedings of the Acoustics, Speech, and Signal Processing, 2001. on IEEE International Conference - Volume 03
Fast Blind Measurement of Blocking Artifacts in both Pixel and DCT Domains
Journal of Mathematical Imaging and Vision
Using edge direction information for measuring blocking artifacts of images
Multidimensional Systems and Signal Processing
A Weighted Sobel Operator-Based No-Reference Blockiness Metric
PACIIA '08 Proceedings of the 2008 IEEE Pacific-Asia Workshop on Computational Intelligence and Industrial Application - Volume 01
Study of subjective and objective quality assessment of video
IEEE Transactions on Image Processing
Image quality assessment: from error visibility to structural similarity
IEEE Transactions on Image Processing
A Statistical Evaluation of Recent Full Reference Image Quality Assessment Algorithms
IEEE Transactions on Image Processing
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Some image and video processing algorithms can have the unintended consequence of introducing blocking artifacts into the processed imagery. Measuring blockiness plays an important role in many applications. This paper presents a reference-free blockiness measurement method. For a given image, the absolute difference between horizontally adjacent pixels is computed, normalized, and averaged along each column. A one-dimensional discrete Fourier transform is thereafter employed and a vertical blockiness measure is derived. A horizontal blockiness measure is computed similarly. Finally, a blockiness measure for the given image is formulated by pooling those two directional blockiness measures. The proposed method can accurately assess the blockiness without any a priori knowledge of the block origin and block size; therefore it is a blind measure. Experimental results show the effectiveness of the proposed method. The robustness of the proposed method is also justified.