title: How to detect the presence of a simple but translucent shape?
body: <p>I'm quite new to OpenCV and CV as a whole. I'm trying to create a state detector that allows me to extract information from the screen in a certain game. This feature pre-processing is almost complete, but up until now I have used colour as the main way of extracting useful information. I wish to capture as to whether this red shield shape is present in the screen:
  (<a href="https://i.stack.imgur.com/MsVea.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/MsVea.png" alt="https://cdn.discordapp.com/attachments/537774605365149716/537786159103737869/unknown.png"></a>)</p>
  
  <p>The shield is always shaped like this, but is translucent and so the colour test cannot be applied.</p>
  
  <p>I have not yet tried a solution, as after much searching and learning, for this one problem I'm not sure where to start.</p>
  
  <p>I have an image <code>processedImage</code>, and would like to extract a simple bool describing whether this shape is present or not.</p>
  
  <p>Any help would be greatly appreciated.</p>
  
  <p>Thanks.</p>