Methods and apparatus for histogram based tone mapping

An apparatus for video processing, comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• receive a video stream including a plurality of frames, each of the plurality of frames including luminance information;
• perform a histogram analysis on the luminance information for each of the plurality of frames;
• calculate an average luminance of the luminance information for each of the plurality of frames based on the histogram analysis;
• store the average luminance of the luminance information for each of the plurality of frames based on the histogram analysis in at least one of a memory, a dynamic random access memory (DRAM), or a cache;
• determine whether a difference between the average luminance of the luminance information for each of the plurality of frames and an average luminance of a current luminance distribution is greater than a perceptual threshold based on a comparison between the average luminance for the frame and the average luminance of the current luminance distribution;
• and
• calculate an updated tone mapping configuration based on the luminance information for the frame based on the difference between the average luminance of the luminance information for the frame and the average luminance of the current luminance distribution of each of the plurality of frames being greater than the perceptual threshold.

An apparatus for video processing, comprising:

• means for receiving a video stream including a plurality of frames, each of the plurality of frames including luminance information;
• means for performing a histogram analysis on the luminance information for each of the plurality of frames;
• means for calculating an average luminance of the luminance information for each of the plurality of frames based on the histogram analysis;
• means for storing the average luminance of the luminance information for each of the plurality of frames based on the histogram analysis in at least one of a memory, a dynamic random access memory (DRAM), or a cache;
• means for determining whether a difference between the average luminance of the luminance information for each of the plurality of frames and an average luminance of a current luminance distribution is greater than a perceptual threshold based on a comparison between the average luminance for the frame and the average luminance of the current luminance distribution;
• and
• means for calculating an updated tone mapping configuration based on the luminance information for the frame based on the difference between the average luminance of the luminance information for the frame and the average luminance of the current luminance distribution of each of the plurality of frames being greater than the perceptual threshold.

A non-transitory computer-readable medium storing computer executable code for video processing, the code when executed by a processor causes the processor to:

• receive a video stream including a plurality of frames, each of the plurality of frames including luminance information;
• perform a histogram analysis on the luminance information for each of the plurality of frames;
• calculate an average luminance of the luminance information for each of the plurality of frames based on the histogram analysis;
• store the average luminance of the luminance information for each of the plurality of frames based on the histogram analysis in at least one of a memory, a dynamic random access memory (DRAM), or a cache;
• determine whether a difference between the average luminance of the luminance information for each of the plurality of frames and an average luminance of a current luminance distribution is greater than a perceptual threshold based on a comparison between the average luminance for the frame and the average luminance of the current luminance distribution;
• and
• calculate an updated tone mapping configuration based on the luminance information for the frame based on the difference between the average luminance of the luminance information for the frame and the average luminance of the current luminance distribution of each of the plurality of frames being greater than the perceptual threshold.