An Adaptive Luminance Mapping Scheme for High Dynamic Range Content Display

Ideally, the Perceptual Quantizer (PQ) for High Dynamic Range (HDR) image presentation requires a 12-bit depth to ensure accurate quantization. In most cases, mainstream displays employ a limited 10-bit PQ function for HDR image display, resulting in notable issues such as perceived contrast loss and the emergence of pseudo-contours in the image hierarchy, particularly in low-brightness scenes. To address this issue, this paper proposes a novel luminance mapping relationship while preserving a 10-bit depth. Unlike conventional methods that derive PQ using a fixed Just Noticeable Difference (JND) fraction, this approach incorporates an adaptive adjustment factor. By adjusting the JND fraction according to brightness levels, this method effectively optimizes the quantization interval, improves reproducible contrast, and ensures uniform perception. The results demonstrate that the proposed approach effectively reduces the perception of contrast loss in low-brightness scenes, eliminates potential artifacts, and enhances the presentation quality of the display system.