// Instructions:
// To blur an image, we'll use a simple idea. Consider the first
// 4 x 4 block of pixels in the image at the top left. Suppose
// we compute the average intensity of the 16 pixels in that block.
// Call this average avg. Then, in the blurred image, all 16 of
// those pixels will have the same intensity, equal to avg. Thus,
// we replace the intensity of each pixel with the average intensity
// of the k x k block it belongs to. Clearly, large values of k will
// cause significant blurring.
//
// In the code below, your job is to take an image and blur it using
// the above approach.

public class ImageBlur {

    public static void main (String[] argv)
    {
	ImageTool imTool = new ImageTool ();
	int[][] pixels = imTool.imageFileToGreyPixels ("ace.jpg");
	imTool.showImage (pixels, "original");
	// Each block of k x k pixels has the same color.
	int k = 4;
	int[][] blurredPixels = blur (pixels, k);
	imTool.showImage (blurredPixels, "blurred");
    }

    static int[][] blur (int[][] pixels, int blurSize)
    {
	// WRITE YOUR CODE HERE.
    }

}