IntegralImage2 Class

[SecurityCriticalAttribute]
public class IntegralImage2 : IDisposable

<SecurityCriticalAttribute>
Public Class IntegralImage2
	Implements IDisposable

// Let's say we have the following image representation:
byte[,] img =
{
    { 5, 2, 3, 4, 1 },
    { 1, 5, 4, 2, 3 },
    { 2, 2, 1, 3, 4 },
    { 3, 5, 6, 4, 5 },
    { 4, 1, 3, 2, 6 },
};

// Let's convert it to bitmap and 
// pretend it is our input image:
Bitmap bmp = img.ToBitmap();

// Now, create an integral image from this bitmap:
IntegralImage2 ii = IntegralImage2.FromBitmap(bmp);

// The sum-table would be:
long[,] actual = ii.Image;

// Which would be the same as:
long[,] expected =
{
    { 0,  0,  0,  0,  0,  0 },
    { 0,  5,  7, 10, 14, 15 },
    { 0,  6, 13, 20, 26, 30 },
    { 0,  8, 17, 25, 34, 42 },
    { 0, 11, 25, 39, 52, 65 },
    { 0, 15, 30, 47, 62, 81 }
};

// In this example, we will compute an integral image
// representation of Lena Söderberg's famous picture:
TestImages testImages = new TestImages(path: localPath);
Bitmap lena = testImages["lena.bmp"]; // get the image

// Create a new Integral Image (squared and tilted) from Lena's picture:
IntegralImage2 ii = IntegralImage2.FromBitmap(lena, computeTilted: true);

// Let's say we would like to get the summed area in the rectangular region
// delimited by pixel (34, 50) until pixels (60, 105). This is equivalent to
// the region under the rectangle (34, 50, 34+60, 50+105) = (34, 50, 94, 155):
long sum = ii.GetSum(34, 50, 94, 155); // this is the sum of values (1760032)

// Now let's say we would like to get the squared sum and tilted sum as well:
long ssum = ii.GetSum2(34, 50, 94, 155); // this is the sum of squared values (229508896)
long tsum = ii.GetSumT(34, 50, 94, 155); // this is the sum of tilted values (-593600)