HDR HDR Method and Apparatus for pre-processing of HDR iamge encoding apparatus based on a single quality value Method for encoding HDR iamge based on a single quality value

摘要

Disclosed is a preprocessing method for implementing an encoding apparatus that encodes a high dynamic range (HDR) image by setting only a single image quality value. A pre-processing method according to an embodiment of the present invention includes: receiving a first image quality value to be applied to encoding a low dynamic range (LDR) image generated by applying tone mapping to the HDR image; Calculating an optimal second image quality value at which the restored image corresponding to the HDR image has an optimal image quality from among a plurality of second image quality values applicable to a residual image corresponding to a residual value between the HDR image and the LDR image ; and calculating an image quality relational expression representing a relationship between the first image quality value and the optimal second image quality value.