title: Detecting location of music note dots in a sheet music image
body: <p>I want to start a project that uses a very basic form of optical music recognition.</p>
  
  <p><strong>For those who understand sheet music:</strong> Unlike other OMR projects, the only information which needs to be extracted is the order and pitch values of each note in a bar. Quarter notes, half notes and whole notes need to be distinguished. Shorter notes can acceptably be interpreted as quarter notes. Dots on notes can be ignored. Dynamics markings are not important</p>
  
  <p><strong>For everyone:</strong> Strictly speaking I need to find the locations of each of the following...</p>
  
  <p><img src="https://i.stack.imgur.com/EXtsi.jpg" alt="enter image description here"></p>
  
  <p>... in a sample image like this...
  <img src="https://i.stack.imgur.com/Kmo04.jpg" alt="enter image description here"></p>
  
  <p>I have no experience in image processing so a basic, conceptual explanation of what technique or set of techniques are used to achieve this would be greatly appreciated.</p>