image comparison

i am currently doing(going to start) a new project on image comparison method. Basically i want to compare 2 images changed under any circumstances( moustache,beard,inclination etc). I will be going to compare the new image with the database i have and give the closest possible match i get. I request you to help me with this. pls forward me whatever material or research papers you have in relation to this project.I will be very thankful to you.

Answer 1

[Image Analyst]

You could use SSIM : http://en.wikipedia.org/wiki/SSIM "The structural similarity (SSIM) index is a method for measuring the similarity between two images. The SSIM index is a full reference metric, in other words, the measuring of image quality based on an initial uncompressed or distortion-free image as reference. SSIM is designed to improve on traditional methods like peak signal-to-noise ratio (PSNR) and mean squared error (MSE), which have proved to be inconsistent with human eye perception."

or better yet, do some research on CBIR. Just Google "CBIR database"

[sahil316]

how i would deal with inclination etc???does this method include that??

[Image Analyst]

I have no idea what inclination means in the context of CBIR or image comparison.

[sahil316]

like if the image has been titled or rotated by some angle

[Image Analyst]

Then you're best off using something like SURF (see wikipedia) which has been used rather successfully to find matching images in databases that have been cropped, scaled, and/or rotated.

[sahil316]

thanx a lot..i am going to study that.

[sahil316]

sir do you know anything about face detection.Like if i have to extract a face out of an image and then i can compare it with the database i have using SURF.

[Image Analyst]

Why don't you use face detection built in to the 2012a Computer Vision Toolbox: http://www.mathworks.com/help/toolbox/vision/gs/btd0kx6-1.html

[sahil316]

Sir i dont have this toolbox..is there any other way to do that using the other toolboxes??

[sahil316]

sir is there any other way in matlab for the same???

[Image Analyst]

Yes, if you write it yourself, or find something in the File Exchange. But I don't have any face recognition/detection code for you.

[sahil316]

all right sir.i will look into it.thanx again!

[sahil316]

sir can you please give me the list of all the face detection methods which can be applied using matlab.Actually now i am going to compare all the methods in my project and give conclusion on which one is most optimal.

[Image Analyst]

Here is the list: http://iris.usc.edu/Vision-Notes/bibliography/contentspeople.html#Face%20Recognition,%20Detection,%20Tracking,%20Gesture%20Recognition,%20Fingerprints,%20Biometrics

[sahil316]

sir i did get this list from your comment on some other link but i am unable to find source codes in matlab in this website. DO u have any links of matlab codes with you that can be of my help.??thanx in advance!

Answer 2

[Ali]

You could try computing either the mean square error or signal to noise ratio of the two images and see which one gives you the least errors.