title: How to get croped image captured from CAMERA
body: <p>How to get the crop image which are bounded within a section which are shown in Image.</p>
  
  <p>I want my app to capture an image of a book page, which contain 4 image patterns at the corners. I want it to first match those pattern and then to remove all the part which is not available inside the boundary of those 4 images. </p>
  
  <p><img src="https://i.stack.imgur.com/NYCfy.jpg" alt="enter image description here"></p>