Causes and subjective evaluation of blurriness in video frames

Authors:
Francesca Dardi;Leonardo Abate;Jeroen Stessen;Giovanni Ramponi
Affiliations:
Department of Engineering and Architecture, University of Trieste, via A. Valerio 10, I-34127 Trieste, Italy;Department of Engineering and Architecture, University of Trieste, via A. Valerio 10, I-34127 Trieste, Italy;TP Vision Netherlands-Innovation Site Eindhoven, SFH-5 Kastanjelaan 1000, 5616 LZ Eindhoven, The Netherlands;Department of Engineering and Architecture, University of Trieste, via A. Valerio 10, I-34127 Trieste, Italy
Venue:
Image Communication
Year:
2013

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Abstract

A method to automatically assess the seriousness of the blurriness artifact in video frames displayed on a state-of-the-art TV monitor is presented. Different types of the artifact are identified, depending on the stage of the video chain where they are originated, namely, blur produced during acquisition, post-processing and encoding. Every type is observed to produce slightly different effects on the frame and, more importantly, to affect image quality differently, so that distinguishing among types is necessary to perform an appropriate restoration. Two main metrics are therefore introduced for classifying the type of blurriness and, when useful, measuring its strength. Particular care was taken in distinguishing the intentional background blur, which does not cause an actual degradation in the frame quality. The appropriateness of the method in classifying the artifact and predicting the subjective frame quality was verified in the experiments.