IEEE Trans Image Process - Optimizing a tone curve for backward-compatible high dynamic range image and video compression.

Tópicos

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Resumo

For backward compatible high dynamic range (HDR) video compression, the HDR sequence is reconstructed by inverse tone-mapping a compressed low dynamic range (LDR) version of the original HDR content. In this paper, we show that the appropriate choice of a tone-mapping operator (TMO) can significantly improve the reconstructed HDR quality. We develop a statistical model that approximates the distortion resulting from the combined processes of tone-mapping and compression. Using this model, we formulate a numerical optimization problem to find the tone-curve that minimizes the expected mean square error (MSE) in the reconstructed HDR sequence. We also develop a simplified model that reduces the computational complexity of the optimization problem to a closed-form solution. Performance evaluations show that the proposed methods provide superior performance in terms of HDR MSE and SSIM compared to existing tone-mapping schemes. It is also shown that the LDR image quality resulting from the proposed methods matches that produced by perceptually-based TMOs.

Resumo Limpo

backward compat high dynam rang hdr video compress hdr sequenc reconstruct invers tonemap compress low dynam rang ldr version origin hdr content paper show appropri choic tonemap oper tmo can signific improv reconstruct hdr qualiti develop statist model approxim distort result combin process tonemap compress use model formul numer optim problem find tonecurv minim expect mean squar error mse reconstruct hdr sequenc also develop simplifi model reduc comput complex optim problem closedform solut perform evalu show propos method provid superior perform term hdr mse ssim compar exist tonemap scheme also shown ldr imag qualiti result propos method match produc perceptuallybas tmos

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