I want to find the difference between all the features to get a difference vector for any two face of image.

I am doing face recognition using matlab software. I already managed to get the interested features (L_eye, R_eye, nose, mouth, center_eye). From here i have calculated the distance and ratios.

from the calculated ratios, i want to , for any two pair of faces, find the difference between all the features to get a difference vector.

Can anyone guide me how to calculate it?

[Nikhila Joshy]

Can you share the code to find the interested features from the face and the distances between them?

Answer 1

[Image Analyst]

differenceVector = face1Vector - face2Vector;

[nik]

Hi, Thanks for your reply.

May i know how to get the face1vector?

I have all the coordinates for interest area in a face (L_eye, R_eye, Center_Eye, Nose, Mouth).

Please guide.

[Image Analyst]

No. You said "i have calculated the distance and ratios" so I assume you have done that already.

[nik]

yes i have calculated it. i am using euclidean distance to calculate the distance from the gathered coordinates. then i calculate the ratios as below: # distance between l_eye and r_eye/distance between center_eye and nose # distance between l_eye and r_eye/distance between center_eye and mouth # distance between center_eye and nose/distance between center_eye and mouth

did you mean that i just need to subtract the face1ratios to face2ratios in order to get the diff?

[Image Analyst]

So just concatenate all the numbers you have measured into one vector. Then if you want, you can subtract the vectors of two images.

[nik]

Image Analyst,

I will be very grateful if you can check either i am doing it in a right way or not.

FACE 1 * L_Eye_Face1 = 129,158 * R_Eye_Face1 = 129,232 * Center_Eye_Face1 = 129,195 * Nose_Face1 = 166,195 * Mouth_Face1 = 203,195 * D1 _Face1 = 74 * D2 _Face1 = 37 * D3 _Face1 = 74 * R1_Face1 = 2.00 * R2_Face1 = 1.00 * R3_Face1 = 0.50

FACE 2 * L_Eye_Face2 = 82,151 * R_Eye_Face2 = 83,210 * Center_Eye_Face2 = 82,181 * Nose_Face2 = 113,181 * Mouth_Face2 = 142,181 * D1 _Face2 = 59.01 * D2 _Face2 = 31 * D3 _Face2 = 60 * R1_Face2 = 1.90 * R2_Face2 = 0.98 * R3_Face2 = 0.52

VectorFace1 = [2.00 1.00 0.50] VectorFace2 = [1.90 0.98 0.52] DiffVector = VectorFace1 – VectorFace2 DiffVector = 0.1000 0.0200 -0.0200

[Image Analyst]

I don't know what those first two paragraphs are doing, but it does not look like proper MATLAB syntax. I have no idea what any of those numbers or variables mean.

As far as the vectors in the third paragraph go, yes you are creating vectors and yes, you are subtracting them but that's about all I can say. They seem to be created with just some arbitrary numbers, and you don't do anything after that with them other than subtracting them. What did you expect to happen?

[nik]

thank you for your reply.

firstly i am sorry, its looks like those first two paragraph does not appear like list item like i want it to be.

Yes, it is not a matlab syntax, it were just the value that i want to use in my vector.

actually i want to find the difference between face images in order to find the right image (face recognition). since i already got the coordinates for the interest area that i want. from there i calculate the distances, ratios, and standard deviation. then i compare it with another face image. the minimum differences should be the same face image.

i try to find other better way for the recognition step.. like formula or something.. in order to come out with a better recognition rate.

[Walter Roberson]

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