The steps are
- Extract the red channel from the RGB image.
- Align image so that upper left circle is at some known location, and lower right circle is at some known location.
- Define a template that is a little square or circle.
- Get a sub image from every one of the 5 columns in a row of circles.
- Find out which one has the lowest mean - use mean2().
- From the mean, assign an answer of A-E based on which column had the lowest mean.
[selection, theAnswer] = min(theMeansForThisRow);
Not too hard (actually, easy ) except step 2 might be a little hard if the images are not aligned already.
