Question

TAsk II: Statrix ave rage 1. Write a Mat lab script that reads a greyscale image from the file 'picture.jpg' into the 2D array (matrix) X. Then display the image. 2. Expand on the previous seript by computing the "local average" of each element of X, and storing it in the corresponding element of a new matrix Y. The local average of a matrix element is the mean value of it and its surrounding 8 neighbours. You should disregard the border of the image (first and last row and column) as they have less than 8 neighbours. Display the new image. 3. Recalculate the local average but instead of ignoring the image border, instead "pad" the image with zeros before performipg the caleulation. Padding is just adding a layer of pixels all around the image with a value of zero. Store the resulting matrix in Z and display the new image.

Answer 1

1)

%reading the grey scale image into 2D matrix X
X = imread('picture.jpg',3);
%displaying matrix X of grey scale
display(X);
% displaying image using created matrix X
imshow(X)

ans ,:,1) Columns 1 through 12: 203 203 203 203 203 203 203 203 202 202 202 202 200 200 200 200 200 200 200 200 199 199 199 199 196 196 196 196 196 196 196 196 196 196 196 196 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 195 195 194 195 195 195 195 195 195 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 194 196 195 194 193 194 194 194 194 194 194 194 194 194 194 194 194 196 195 194 193 194 194 194 194 196 195 194 193 194 194 194 194 194 194 194 194 194 194 194 194 196 195 194 193 194 194 194 194 196 195 194 193 194 194 194 194 194 194 194 194 194 194 194 194 196 195 194 193 194 194 194 194 196 195 194 193 194 194 194 194 194 194 194 194 194 194 194 194 196 195 194 193 194 194 194 194 195 194 193 193 193 193 193 193 194 194 194 194 193 194 194 194 196 195 193 193 194 193 194 194 196 194 194 195 194 193 194 194 194 194 194 194 194 194 194 194 194 196 195 194 194 194 194 194 194 196 195 194 194 194 194 194 194 194 194 194 193 194 194 194 194 196 195 194 194 194 194 194 193 194 196 195 193 193 194 194 193 194 194 194 193 193 194 194 195 194 193 193 193 193 194 194 192 194 195 193 193 193 193 193 193 193 193 193 193 193 195 193 192 193 193 193 194 193 193 193 192 193 195 193 193 193 193 193 194 193 193 193 195 192 192 193 193 193 193 194 193 193 193 193 192 194 193 195 192 191 192 193 193 193 193 193 194 192 191 192 193 192 192 194 193 193 193 193 194 192 192 193 191 192 193 192 193 193 193 193 194 192 191 192 193 192 192 193 193 193 193 193 193 193 195 194 192 193 193 193 193 193 193 193 195 194 193 192 193 193 193 193 193 193 193 193 193 193 193 195 194 192 193 193 193 193 193 193 195 194 193 192 193 193 193 193 193 193 193 193 195 194 193 192 193 193 193 193 193 193 193 193