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A Perceptual Image Sharpness Metric Based on Local Edge Gradient Analysis

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3 Author(s)
Feichtenhofer, C. ; Inst. of Electr. Meas. & Meas. Signal Process., Graz Univ. of Technol., Graz, Austria ; Fassold, H. ; Schallauer, P.

In this letter, a no-reference perceptual sharpness metric based on a statistical analysis of local edge gradients is presented. The method takes properties of the human visual system into account. Based on perceptual properties, a relationship between the extracted statistical features and the metric score is established to form a Perceptual Sharpness Index (PSI). A comparison with state-of-the-art metrics shows that the proposed method correlates highly with human perception and exhibits low computational complexity. In contrast to existing metrics, the PSI performs well for a wide range of blurriness and shows a high degree of invariance for different image contents.

Published in:

Signal Processing Letters, IEEE  (Volume:20 ,  Issue: 4 )