How to match single Image with multiple images using MATLAB?

For example I have a 100 images in my directory of which 'x' images are same and I would like to know the value of x.

% Reference image
img_ref = imread('img_ref.jpg');

% Create an variable for alloc the path
img_path ='/your/dir/of/images/'

% Create an variable struct, for searching files with .jpg extension 
names = dir(fullfile(img_path, '*.jpg'));

% Counts the number of images on the path
n_imgs = numel(names); 

for n = 1:n_imgs
    full_name = fullfile(img_path, names(n).name);
    your_imgs = imread(full_name);

    r = isMatch(img_ref,your_imgs);
    disp(r)
end

You can use the function created above by Rob F.

function[result] =  isMatch(RealImage, TestImage)

testImage = imread(TestImage);
if (sum(sum(sum(RealImage == testImage))) == size(RealImage,1) * size(RealImage,2) * size(RealImage,3))
    result = true;
else
    result = false;

end