title: image information along a polar coordinate system
body: <p>I have a set of png images that I would like to process with Python and associated tools. Each image represents a physical object with known dimensions.</p>
  
  <p>In each image there is a specific feature of the object at a certain pixel/physical location. The location is different for each image.</p>
  
  <p>I would like to impose a polar coordinate system on a given image with the origin at the location of this feature.  </p>
  
  <p>I would then like to be able to get the following information:
  - the image intensity as a function of radial position for a given polar angle
  - the image intensity as a function of radial position when values are averaged over all polar angles.</p>
  
  <p>I am experienced in Python programming and the use of many functions in NumPy and SciPy, but I am a complete novice when it comes to image analysis. </p>
  
  <p>I would appreciate any advice you can give me on possible approaches to use to solve this problem.</p>
  
  <p>Thank you.</p>