hi how i can compare a image captured by webcam and the images saved on a folder

i need a code for compare a image captured by webcam and the images saved on a folder

Answer 1

[Image Analyst]

How about subtracting them?

[chaala chibani]

after subtracting them,how can i know that different or not!

[Image Analyst]

If the pixels are not different the result of the subtraction will be zero!

[chaala chibani]

can you give me a exemple please!

[Image Analyst]

differenceImage = double(image1) - double(image2);
if all(differenceImage(:) == 0)
  uiwait(helpdlg('Images are the same'));
else
  uiwait(helpdlg('Images are NOT the same'));
end

[chaala chibani]

this is my code: image1=imread('C:\images\im2.jpg','jpg'); X1=imread('C:\photo\A.jpg','jpg'); image2=rgb2gray(X1); differenceImage = double(image1) - double(image2); if all(differenceImage(:) == 0) uiwait(helpdlg('Images are the same')); else uiwait(helpdlg('Images are NOT the same')); end

he gave me this error ??? Error using ==> minus Matrix dimensions must agree.

Error in ==> exercice at 4 differenceImage = double(image1) - double(image2);

[Image Analyst]

Read http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup this.

Your images need to have the same number of rows and columns. Otherwise how can you subtract them?

[chaala chibani]

thank you :