r. 125, P.0.5, p-0. 125. P-O. 1 25. P-O.125, calculate the entropy for the four symbol alphabets. Hint Unit of measurement for entropy is bits Given a following picture with the gray value to, 255], please use the MEDIAN filter (3 by 3) to calculate the gray value of the central pixel (only a pixel in the question mark) 100 100 100 100 100 100 200 205 203 100 100 195 200 200 100 100 200 205 195 100 100 100 100 100 100 photo calculate the middle pixel