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High dynamic range (HDR) images that include large differences in brightness levels are studied to address the lack of knowledge on the quality estimation method for real HDR images. For this, we proposed the local peak signal-to-noise ratio (LPSNR), using the maximum value of neighboring pixels. Next, we proposed an objective estimation method that considers spatial frequency characteristics based...
Inter-picture prediction uses a local decoded picture for the reference, in order to avoid a mismatch between encoding and decoding. However, this scheme does not necessarily result in optimal coding efficiency since it requires encoding the processing altogether. Therefore, we study the use of the original picture as the reference. In this case, although the mismatch causes degradation of the picture...
As standard video encoder techniques have matured, their rate of improvement has slowed. Greater improvements are possible with purely new coding techniques; however, these are incompatible with conventional methods. As an alternative, a new coding concept with semi-compatibility has been proposed, and an enhancement to I-pictures efficiency has been discussed. This applied method reduces the quantization...
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