1 | 1 | 1 | 2 | 1 | 1 | 1 |
| −1 | −1 | −1 | 0 | 1 | 1 | 1 |
1 | 1 | 2 | 2 | 2 | 1 | 1 |
| −1 | −1 | −2 | 0 | 2 | 1 | 1 |
1 | 2 | 3 | 4 | 3 | 2 | 1 |
| −1 | −2 | −3 | −0 | 3 | 2 | 1 |
0 | 0 | 0 | 0 | 0 | 0 | 0 |
| −2 | −3 | −4 | 0 | 4 | 3 | 2 |
−1 | −2 | −3 | −4 | −3 | −2 | −1 |
| −1 | −2 | −3 | 0 | 3 | 2 | 1 |
−1 | −1 | −2 | −3 | −2 | −1 | −1 |
| −1 | −1 | −2 | 0 | 2 | 1 | 1 |
−1 | −1 | −1 | −2 | −1 | −1 | −1 |
| −1 | −1 | −1 | 0 | 1 | 1 | 1 |
SOBEL Filter N-S |
| SOBEL Filter E-W | ||||||||||||
0 | 1 | 1 | 1 | 1 | 1 | 2 |
| 2 | 1 | 1 | 2 | 1 | 1 | 0 |
−1 | 0 | 2 | 2 | 2 | 3 | 1 |
| 1 | 3 | 2 | 2 | 2 | 0 | −1 |
−1 | −2 | 0 | 3 | 4 | 2 | 1 |
| 1 | 2 | 4 | 3 | 0 | −2 | −1 |
−1 | −2 | −3 | 0 | 3 | 2 | 1 |
| 1 | 2 | 3 | 0 | −3 | −2 | −1 |
−1 | −2 | −4 | −3 | −0 | 2 | 1 |
| −1 | −2 | −3 | −4 | −3 | −2 | −1 |
−1 | −3 | −2 | −2 | −2 | 0 | 1 |
| −1 | −1 | −2 | −3 | −2 | −1 | −1 |
−2 | −1 | −1 | −1 | −1 | −1 | 0 |
| −1 | −1 | −1 | −2 | −1 | −1 | −1 |
SOBEL Filter NE-SW |
| SOBEL Filter NW-SE |