A) Consider the 1-D image I = [0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1]. Convolve the 1-D filter [1/3, 1/3, 1/3] with this image and write the output. Since the image is 12 pixels long, and the filter is 3 pixels, the output should be 9 pixels. What operation does this filter perform?

B) What is one illusion which can be explained in terms of the center-surround organization of the retinal ganglion cells. Explain how it works.