MatLab Facial Detection Assistance

Greetings,

I have been trying to get some of the code in Doug Hull's video blog to work on a directory of images. Basically, I want to perform the upper-body crop trick to each image in the directory...but I am running into an 'index out of bounds error' anywhere I use the loop index to reference the bbox matrix. It keeps saying the size of the bbox_body is [1,4] and then it tries to access [2:].

Any assistance would be appreciated, I am kind of a novice to MatLab in general.

CODE:

class="code" dirListing = dir('*.jpg');

for d=1:length(dirListing) if ~dirListing(1).isdir

        img = imread(dirListing(d).name);

        faceDetector = vision.CascadeObjectDetector();

        bodyDetector = vision.CascadeObjectDetector('UpperBody');
        bodyDetector.MinSize = [60 60];
        bodyDetector.ScaleFactor = 1.05;

        bbox_body = step(bodyDetector, img);

        shapeInserter = vision.ShapeInserter('BorderColor', 'Custom', 'CustomBorderColor', [0 255 0]);

         bbox_face = zeros(size(bbox_body));
         for index=1:length(bbox_body)
             ImgCrop = imcrop(img, bbox_body(index,:));
             bbox = step(faceDetector, ImgCrop);
             bbox_face(index,:) = bbox + [bbox_body(index,1:2)-1 0 0];
         end

         ImgFaces2 = step(shapeInserter, img, int32(bbox_face));
         figure, imshow(ImgFaces2), title('With Upper Body');

   end
end 
</pre>

[Elliott]

Disregard the class="code and /pre tags

Answer 1

[Dima Lisin]

It may be the case that the detector is not finding any objects in your image. You should check bbox for being empty before indexing into it.