Method and apparatus for adaptive contrast enhancement of image data

A device configured for adaptive contrast enhancement of image data, the device comprising:

• at least one input terminal configured to receive image data for a first frame;
• and
• a processor coupled to the input terminal, the processor configured to:
• determine a pixel distribution for at least one color space component of the first frame based on luminance values in the at least one color space component;
• extend a look-up table (LUT) curve in at least one of a bright region and dark region of the pixel distribution;
• adjust a LUT associated with the pixel distribution based on the extended LUT curve;
• convert the luminance values of the pixels in the first frame in the at least one color space component based on the adjusted LUT to generate an enhanced image frame;
• and
• output the enhanced image frame.

A device configured for adaptive contrast enhancement of image data, the device comprising:

• at least one input terminal configured to receive image data for a first frame;
• and
• a processor coupled to the input terminal, the processor configured to:
• determine a first pixel distribution for at least one color space component of the first frame based on luminance values of pixels in the at least one color space component;
• convert luminance values of the pixels in the first frame in the at least one color space component based on a look-up table (LUT) to generate an enhanced image frame;
• output the enhanced image frame;
• determine a second pixel distribution for the at least one color space component of a second frame based on luminance values of pixels in the at least one color space component;
• detect a scene change based on a comparison of the first and second pixel distributions;
• and
• update the LUT based on a detected scene change.

A device configured for adaptive contrast enhancement of image data, the device comprising:

• at least one input terminal configured to receive image data for a first frame;
• and
• a processor coupled to the input terminal, the processor configured to:
• determine a pixel distribution for at least one color space component of the first frame based on luminance values of the pixels in the at least one color space;
• calculate an average picture level in the at least one color space based on the pixel distribution;
• adjust a look-up table (LUT) associated with the pixel distribution based on the average picture level;
• convert the luminance values of the pixels in the first frame in the at least one color space based on the LUT to generate an enhanced image frame;
• and
• output the enhanced image frame.