Problem $4$: a$)$ Let h and h$2$ be to orthogonal convolution operators: To$-1$ h $=1021-101-2-10]-101012)$ What is the difference between the estimates of gradient magnitude and gradient direction that we find based on the results from the operators h and h$2,$ as compared to the ordinary Sobel operators hx and hy: $10-1]$ h$.=20-210-1]1-1-2-1$ h $=000121$ b$)$ Are the filters h$,$ and he separable into ID$-$filters? What about hy and hy$?$ Give reasons for your answers.