how to detect answers which student chose it in answer sheet

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Abdalla Mansour
Abdalla Mansour el 24 de En. de 2015
Comentada: Image Analyst el 11 de Feb. de 2017
hi , i want steps to create program to detect answers from answer sheet ex : (detect that student chose 'A' in question '1' in attached image ) thanks in advance

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Image Analyst
Image Analyst el 24 de En. de 2015
The steps are
  1. Extract the red channel from the RGB image.
  2. Align image so that upper left circle is at some known location, and lower right circle is at some known location.
  3. Define a template that is a little square or circle.
  4. Get a sub image from every one of the 5 columns in a row of circles.
  5. Find out which one has the lowest mean - use mean2().
  6. 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.
  4 comentarios
AminaOsmanova
AminaOsmanova el 11 de Feb. de 2017
Please could you help me too.I can`t compare detected answers with the actual answer key stored in an excel sheet. Please help me
Image Analyst
Image Analyst el 11 de Feb. de 2017
OK, how can I do that?
Read this link and then post your question along with your image and your code that you adapted from this question.

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