Method and apparatus for processing a medium dynamic range video signal in SL-HDR2 format

A processor for processing a video signal, the processor having a first mode to reconstruct a high dynamic range video signal based on a received standard dynamic range video signal and associated metadata, the processor having a second mode to optimize a received high dynamic range video signal for a rendering device, the processor being configured for:

• receiving a medium dynamic range video signal and associated metadata, the metadata including data representative of a peak luminance value of the medium dynamic range video signal;
• receiving data representative of a peak luminance value of a presentation display;
• determining whether the peak luminance value of the medium dynamic range video signal is greater or lower than the peak luminance value of the presentation display;
• and
• processing the medium dynamic range video signal in the first mode if the peak luminance value of the medium dynamic range video signal is smaller than the peak luminance value of the presentation display and in the second mode if the peak luminance value of the medium dynamic range video signal is greater than the peak luminance value of the presentation display, wherein a variable included in the metadata has a data value representing the second mode to specify that a high dynamic range video signal has been pre-processed according to the second mode to generate the medium dynamic range video signal.

A non-transitory computer-readable medium comprising instructions that cause a computer to process a video signal, the processing comprising:

• receiving a medium dynamic range video signal and associated metadata, the metadata including data representative of a peak luminance value of the medium dynamic range video signal;
• receiving data representative of a peak luminance value of a presentation display;
• determining whether the peak luminance value of the medium dynamic range video signal is greater or lower than the peak luminance value of the presentation display;
• configuring a processor based on the determination, wherein the processor has a first mode to reconstruct a high dynamic range video signal based on a received standard dynamic range video signal and associated metadata, and a second mode to optimize a received high dynamic range video signal for a rendering device;
• and
• processing the medium dynamic range video signal by the processor in the first mode if the peak luminance value of the medium dynamic range video signal is smaller than the peak luminance value of the presentation display and in the second mode if the peak luminance value of the medium dynamic range video signal is greater than the peak luminance value of the presentation display, wherein a variable included in the metadata has a data value representing the second mode to specify that a high dynamic range video signal has been pre-processed according to the second mode to generate the medium dynamic range video signal.