IEEE Trans Image Process - Objective quality assessment of tone-mapped images.

Tópicos

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Resumo

Tone-mapping operators (TMOs) that convert high dynamic range (HDR) to low dynamic range (LDR) images provide practically useful tools for the visualization of HDR images on standard LDR displays. Different TMOs create different tone-mapped images, and a natural question is which one has the best quality. Without an appropriate quality measure, different TMOs cannot be compared, and further improvement is directionless. Subjective rating may be a reliable evaluation method, but it is expensive and time consuming, and more importantly, is difficult to be embedded into optimization frameworks. Here we propose an objective quality assessment algorithm for tone-mapped images by combining: 1) a multiscale signal fidelity measure on the basis of a modified structural similarity index and 2) a naturalness measure on the basis of intensity statistics of natural images. Validations using independent subject-rated image databases show good correlations between subjective ranking score and the proposed tone-mapped image quality index (TMQI). Furthermore, we demonstrate the extended applications of TMQI using two examples-parameter tuning for TMOs and adaptive fusion of multiple tone-mapped images.

Resumo Limpo

tonemap oper tmos convert high dynam rang hdr low dynam rang ldr imag provid practic use tool visual hdr imag standard ldr display differ tmos creat differ tonemap imag natur question one best qualiti without appropri qualiti measur differ tmos compar improv directionless subject rate may reliabl evalu method expens time consum import difficult embed optim framework propos object qualiti assess algorithm tonemap imag combin multiscal signal fidel measur basi modifi structur similar index natur measur basi intens statist natur imag valid use independ subjectr imag databas show good correl subject rank score propos tonemap imag qualiti index tmqi furthermor demonstr extend applic tmqi use two examplesparamet tune tmos adapt fusion multipl tonemap imag

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