Accord.Imaging.SpeededUpRobustFeaturesDescriptor.haarX C# (CSharp) Method

haarX() private method

private haarX ( int row, int column, int size ) : double
row int
column int
size int
return double
        private double haarX(int row, int column, int size)
        {
            double a = integral.GetRectangleSum(column, row - size / 2,
                column + size / 2 - 1, row - size / 2 + size - 1);

            double b = integral.GetRectangleSum(column - size / 2, row - size / 2,
                column - size / 2 + size / 2 - 1, row - size / 2 + size - 1);

            return (a - b) / 255.0;
        }