HDR tone mapping methods with scene adaptive parameterized tone map function

An apparatus comprising:

• a display;
• a memory;
• and
• at least one processor operably connected to the memory, the at least one processor configured to:
• receive a quantized video generated by a master display, the quantized video being mastered for a first range of luminance values associated with the master display;
• receive metadata from a tone mapping curve parameter extraction, the metadata comprising at least one maximum value of a luminance parameter of the quantized video as mastered for the first range of luminance values;
• de-quantize the quantized video to produce a de-quantized video;
• apply a tone mapping function defined by a normalized Bezier curve to the de-quantized video;
• generate a tone mapped video mastered for a second range of luminance values associated with the display;
• display, on the display, a user interface configured to receive at least one of a first input for changing a parameter to adjust a customized tone mapping curve corresponding to an image of the tone mapped video or a second input for selecting coordinates to adjust a control point of the customized tone mapping curve;
• and
• perform at least one of:
• in response to receiving the first input, adjust the customized tone mapping curve corresponding to the image based on the changed parameter indicated by the first input;
• or
• in response to receiving the second input, adjust the control point and the customized tone mapping curve based on the selected coordinates indicated by the second input.

A non-transitory computer readable medium comprising program code that, when executed by at least one processor, causes the at least one processor to:

• receive a quantized video generated by a master display, the quantized video being mastered for a first range of luminance values associated with the master display;
• receive metadata from a tone mapping curve parameter extraction, the metadata comprising at least one maximum value of a luminance parameter of the quantized video as mastered for the first range of luminance values;
• de-quantize the quantized video to produce a de-quantized video;
• apply a tone mapping function defined by a normalized Bezier curve to the de-quantized video;
• generate a tone mapped video mastered for a second range of luminance values associated with a target display;
• display, on the target display, a user interface configured to receive at least one of a first input for changing a parameter to adjust a customized tone mapping curve corresponding to an image of the tone mapped video or a second input for selecting coordinates to adjust a control point of the customized tone mapping curve;
• and
• perform at least one of:
• in response to receiving the first input, adjust the customized tone mapping curve corresponding to the image based on the changed parameter indicated by the first input;
• or
• in response to receiving the second input, adjust the control point and the customized tone mapping curve based on the selected coordinates indicated by the second input.