EE114_CA5 - Dylan Ler | 104172087 | EE114 Computer...

Dylan Ler | 104172087 | EE114 Computer Assignment 5
2-D Convolution
For MATLAB Code:
GenerateGaussian.m
function h = GenerateGaussian (size, lambda)
this function generates a Gaussian matrix
generate the meshgrid and the Gaussian matrix
[x,y]= meshgrid([- size / 2 : 1 : size / 2]);
h = exp( - (x .* x + y .*y) / lambda);
find the sum and normalize the matrix
sum_total = sum(sum(h));
h = h ./ sum_total;
ConvolveImages.m
function out = ConvolveImages (image, h)
this function convolves two images and
crop the result to the size of the first one
get the dimensions of the input images
[y_i, x_i] = size(image);
[y_h, x_h] = size (h);
% convolve the images
out = uint8(conv2(image, h));
%crop it to the correct size
out = imcrop(out, [(x_h + 1)/ 2, (y_h + 1) / 2, x_i 1, y_i 1]);
PSNR.m

function psnr = PSNR (i1, i2)