IEEE Trans Image Process - Sparse feature fidelity for perceptual image quality assessment.

Tópicos

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Resumo

The prediction of an image quality metric (IQM) should be consistent with subjective human evaluation. As the human visual system (HVS) is critical to visual perception, modeling of the HVS is regarded as the most suitable way to achieve perceptual quality predictions. Sparse coding that is equivalent to independent component analysis (ICA) can provide a very good description of the receptive fields of simple cells in the primary visual cortex, which is the most important part of the HVS. With this inspiration, a quality metric called sparse feature fidelity (SFF) is proposed for full-reference image quality assessment (IQA) on the basis of transformation of images into sparse representations in the primary visual cortex. The proposed method is based on the sparse features that are acquired by a feature detector, which is trained on samples of natural images by an ICA algorithm. In addition, two strategies are designed to simulate the properties of the visual perception: 1) visual attention and 2) visual threshold. The computation of SFF has two stages: training and fidelity computation, in addition, the fidelity computation consists of two components: feature similarity and luminance correlation. The feature similarity measures the structure differences between the two images, whereas the luminance correlation evaluates brightness distortions. SFF also reflects the chromatic properties of the HVS, and it is very effective for color IQA. The experimental results on five image databases show that SFF has a better performance in matching subjective ratings compared with the leading IQMs.

Resumo Limpo

predict imag qualiti metric iqm consist subject human evalu human visual system hvs critic visual percept model hvs regard suitabl way achiev perceptu qualiti predict spars code equival independ compon analysi ica can provid good descript recept field simpl cell primari visual cortex import part hvs inspir qualiti metric call spars featur fidel sff propos fullrefer imag qualiti assess iqa basi transform imag spars represent primari visual cortex propos method base spars featur acquir featur detector train sampl natur imag ica algorithm addit two strategi design simul properti visual percept visual attent visual threshold comput sff two stage train fidel comput addit fidel comput consist two compon featur similar lumin correl featur similar measur structur differ two imag wherea lumin correl evalu bright distort sff also reflect chromat properti hvs effect color iqa experiment result five imag databas show sff better perform match subject rate compar lead iqm

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