// Send this method a grayscale image, an int radius, and a double intensity
// to blur the image with a Gaussian filter of that radius and intensity.
public static int[,] BlurGreyscale(int[,] image, int length = 5, double intensity = 1)
{
(int width, int height) = (image.GetLength(0), image.GetLength(1));
int[,] output = new int[width - length, height - length];
//Create Gaussian kernel
double[,] kernel = initialiseKernel(length, intensity);
//Convolve image with guassian kernel
output = Convolver.Convolve(image, kernel);
return(output);
}
public static (int[, ], Direction[, ]) IntensityGradient(int[,] image)
{
// Compute intensity
// the derivatives Ix and Iy w.r.t. x and y are calculated. It can be
// implemented by convolving I with Sobel kernels KERNEL_H and KERNEL_V
int[,] horizontalIntensity = Convolver.Convolve(image, KERNEL_H); // Ix
int[,] verticalIntensity = Convolver.Convolve(image, KERNEL_V); // Iy
// Compute magnitude G as sqrt(Ix^2+Iy^2) and
// direction: slope of the gradient as arctan(Iy/Ix) converted to degrees and then to compass directions.
(int[,] gradient, Direction[,] direction) = magnitude(horizontalIntensity, verticalIntensity);
return(gradient, direction);
}