How can i detect the forehead of human face

i detect human face but i need only the forehead may someone help me please thank you

Answer 1

[Image Analyst]

Try running stdfilt() to look for smooth regions. limit the region(s) it finds to the area within some reasonable sized region right above the eyes. Why do you need the forehead?

[djamaleddine djeldjli]

i am using it to measure body temperature, but how can i use stdfilt() to detecte forehead from a face detectef by vision.CascadeObjectDetector

[djamaleddine djeldjli]

this is the code

   rgbImage =imread('6.jpg');

% imshow(rgbImage);
faceDetector = vision.CascadeObjectDetector;
faceDetector.MergeThreshold=16; 
  bboxes = step(faceDetector, rgbImage);
  IFaces = insertObjectAnnotation(rgbImage, 'rectangle', bboxes, 'Face');

   figure, imshow(IFaces), title('Detected faces');
      faceimage = imcrop(rgbImage,bboxes);
        imshow(faceimage);

so to how can i do to detecte the forehead