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Luhong Liang, Jianhua Chen, Siwei Ma, Debin Zhao, & Wen Gao. (2009). A no-reference perceptual blur metric using histogram of gradient profile sharpness. 2009 16th IEEE International Conference on Image Processing (ICIP). doi:10.1109/icip.2009.5413545 
10.1109/icip.2009.5413545