System, method, and computer program for adjusting image contrast using parameterized cumulative distribution functions

A method, comprising:

• receiving, using an image processor, a first image;
• dividing the first image into two or more pixel regions;
• for at least one of the two or more pixel regions, computing a first histogram;
• based on the first histogram, computing a first cumulative distribution function;
• based on the first cumulative distribution function, extracting:
• a first curve fit coefficient,
• a first point associated with the first curve fit coefficient,
• a first angle associated with the first curve fit coefficient,
• a second curve fit coefficient,
• a second point associated with the second curve fit coefficient, and
• a second angle associated with the second curve fit coefficient;
• creating an interpolated cumulative distribution function based on the first curve fit coefficient, the first point, the first angle, the second curve fit coefficient, the second point, and the second angle;
• and
• applying the interpolated cumulative distribution function to the at least one of the two or more pixel regions.

A computer program product comprising computer executable instructions stored on a non-transitory computer readable medium that when executed by a processor instruct the processor to:

• receive a first image;
• divide the first image into two or more pixel regions;
• for at least one of the two or more pixel regions, compute a first histogram;
• based on the first histogram, compute a first cumulative distribution function;
• based on the first cumulative distribution function, extract:
• a first curve fit coefficient,
• a first point associated with the first curve fit coefficient,
• a first angle associated with the first curve fit coefficient,
• a second curve fit coefficient,
• a second point associated with the second curve fit coefficient, and
• a second angle associated with the second curve fit coefficient;
• create an interpolated cumulative distribution function based on the first curve fit coefficient, the first point, the first angle, the second curve fit coefficient, the second point, and the second angle;
• and
• apply the interpolated cumulative distribution function to the at least one of the two or more pixel regions.