An improved model of pixel adaptive just-noticeable difference estimation
A pixel-wise adaptive model for estimating the just-noticeable difference (JND) in spatial domain is proposed in this paper. As the human visual system (HVS) can be considered as a multichannel system, we assume that there exist two channels in the HVS, which deliver luminance adaption factor and texture masking factor, respectively. Both channels affect the JND threshold in a cooperative manner. The texture regions are with abundant redundancy and can tolerate much noise. The disorder degree and spatial masking of the texture are considered to estimate the texture masking effect, for deducing such JND threshold that coincides with the HVS. Finally, the luminance adaptation factor and texture masking factor are combined nonlinearly. Various experiments confirm the improved model has a better visual effect than models proposed before.