MATLAB: How to link fiducial point of face image with its image

Question

Hello all.. I want to perform feature extraction on facial image on its fiducial points using SURF descriptor. Fiducial point is in .dat file and image is in .jpg. So how to merge these to file inorder extract feature from only that fiducial point location. Thank you…

Answer 1

Try to use the following code extracting features from fiducial points.

%%Prepare a facial image
% can be read from .jpg file
bodyDetector = vision.CascadeObjectDetector('UpperBody');
bodyDetector.MinSize = [60 60];
bodyDetector.MergeThreshold = 10;
I = imread('visionteam.jpg');
bboxes = step(bodyDetector, I);
Iroi = imcrop(I,bboxes(1,:));
imshow(Iroi);
%%Fiducial points
% can be read from .dat file
points = [
   47.2687   37.1951;
   54.3481   43.5666;
   62.6075   37.1951;
   72.5187   41.2068;
   52.6963   52.7699;
   38.0654   42.3867];
%%Extract features
[features,validPoints]  = extractFeatures(rgb2gray(Iroi), points, 'Method', 'SURF');
%%Visualize
figure; imshow(Iroi); hold on
plot(validPoints,'showOrientation',true);