automatic extraction of palm print ROI

how can i extract ROI of many b/w images. so can not use the "roipoly" function. how can i do it automatically? more specifically, how can i just get two reference points in each and every image, one between index finger and middle finger, other point between ring finger and index finger. using local minima/maxima?

Answer 1

[Image Analyst]

This question is so vague that all I can do is give generalities. You didn't even upload an image for us to look at. So look at these functions:

imregionalmax(), max(), find(), bwboundaries(), hypot(), etc.

For hand gesture image analysis, see the published literature on it for algorithms: http://iris.usc.edu/Vision-Notes/bibliography/contentspeople.html#Face%20Recognition,%20Detection,%20Tracking,%20Gesture%20Recognition,%20Fingerprints,%20Biometrics There is a list of links to papers:

21.4 Gesture and Pose Analysis

      21.4.1 Human Posture, or Human Pose, Human Body Pose
          21.4.1.1 Human Pose Tracking, Posture Tracking, Posture from Video
          21.4.1.2 Human Posture, Upper Body Posture, Arms
          21.4.1.3 Animation and Reconstruction of Human Model from Posture, or Pose 
      21.4.2 Gesture Recognition Techniques
          21.4.2.1 Gesture, Overviews, Surveys, Evaluations
          21.4.2.2 Pointing Gestures, Pointing Systems
          21.4.2.3 Hand Gesture Systems, Hand Posture, Hand Pose
          21.4.2.4 Hand Tracking for Gestures
              21.4.2.4.1 Arm Tracking, Arm Pose for Gestures 
          21.4.2.5 Gesture Recognition Systems, Applications, Human Computer Interaction Systems
              21.4.2.5.1 Gesture Systems, Surfaces, Desks, Tables 
          21.4.2.6 Music Related Gestures, Systems, Music Video Analysis
          21.4.2.7 Sign Language, ASL Recognition
              21.4.2.7.1 Sign Language, Fingerspelling