2. Given the following 3x3 gray image and a 3x3 filter, calculate the corresponding convolution result of spatial filtering using 1-stride sliding window and zero padding. Hint: the convolution result is also a 3x3 single-channel map. Please show some intermediate procedures about the computation. (20 points) Gray image: 200 100 40 100 100 70 0 50 80 Filter -1 0 1