Method and device for encoding and decoding a HDR picture and a LDR picture using illumination information

摘要

The present disclosure generally relates to a method for encoding a HDR picture and a first LDR picture, the method comprising obtaining a second LDR picture (LDR2) responsive to a ratio between the HDR picture and a backlight picture (Bal) and encoding the first LDR picture and the second LDR picture (LDR2) by predicting one of the first and second LDR pictures by the other one of the first and second LDR pictures. The method is characterized in that it further comprises, before encoding, adjusting the first LDR picture responsive to the backlight picture. The disclosure relates also to a method and device for decoding an LDR picture providing a lower dynamic range depiction of the picture content of an HDR picture.