/** Runs Sobel operator over bordered image.
 * Image is 8x8 plus 1px border, total of 10x10.
 * @author Bob Futrelle
 * @version March 27 2004 v0.1
 **/
 
 public class Sobel {
 
public Edgelet[][] run(double[][] image) {

	Edgelet[][] e = new Edgelet[10][10];	
	
	for(int i=1; i<9; i++)
		for(int j=1; j<9; j++)
		{
			e[i][j] = new Edgelet();
			
			e[i][j].x = 
			- image[i-1][j-1]
			- 2*image[i][j-1]
			- image[i+1][j-1]
			+ image[i-1][j+1]
			+ 2*image[i][j+1]
			+ image[i+1][j+1];

			e[i][j].y = 
			- image[i-1][j-1]
			- 2*image[i-1][j]
			- image[i+1][j+1]
			+ image[i+1][j-1]
			+ 2*image[i+1][j]
			+ image[i+1][j+1];
			
			e[i][j].createMagnitude();	
		}
	
					
	return e;

} // run()


} // class Sobel