Dynamic tone mapping

A system for dynamic tone mapping of video content, comprising:

• one or more memories;
• and
• at least one processor each coupled to at least one of the memories and configured to perform operations comprising:
• receiving histogram data associated with a first video signal representing a video program, wherein the first video signal has a first dynamic range and static metadata describing one or more brightness characteristics of the video program, wherein the histogram data comprises color values for a plurality of frames in the first video signal;
• determining a cumulative histogram for a scene in the video program based on the histogram data;
• determining a near-brightest pixel for the scene in the video program based on the cumulative histogram, wherein the near-brightest pixel is a representative pixel value that defines a maximum target brightness value for proper display of the scene;
• modifying a tone mapping curve based on the near-brightest pixel and ambient light measurement, thereby generating a modified tone mapping curve;
• and
• converting the first video signal based on the modified tone mapping curve, thereby generating a second video signal having a second dynamic range that is less than the first dynamic range.

A non-transitory computer-readable medium having instructions stored thereon that, when executed by at least one computing device, cause the at least one computing device to perform operations comprising:

• receiving histogram data associated with a first video signal representing a video program, wherein the first video signal has a first dynamic range and static metadata describing one or more brightness characteristics of the video program, wherein the histogram data comprises color values for a plurality of frames in the first video signal;
• determining a cumulative histogram for a scene in the video program based on the histogram data;
• determining a near-brightest pixel for the scene in the video program based on the cumulative histogram, wherein the near-brightest pixel is a representative pixel value that defines a maximum target brightness value for proper display of the scene;
• modifying a tone mapping curve based on the near-brightest pixel and ambient light measurement, thereby generating a modified tone mapping curve;
• and
• converting the first video signal based on the modified tone mapping curve, thereby generating a second video signal having a second dynamic range that is less than the first dynamic range.