title: Object detection/tracking within Java
body: <p>I'm looking to do some image processing in Java and I'll be developing in Ubuntu with Eclipse. 
  So here is my objective:</p>
  
  <p>From a greyscale image, I would like to be able to detect certain sized objects and draw a rectangular frame around them. However, the catch is that this image is captured from a thermal imaging camera so to detect body heat the pixels will have a value within a certain range. 
  After detecting all the objects in the image, I will need to count them, but that's later.</p>
  
  <p>So here's my challenge. Which tools/apis/open classes can I use to do something like this. I looked around and found some basic manipulations such as rotate, crop, resize. But haven't really found anything I can use.</p>
  
  <p>Where should I look/start? </p>
  
  <p>thanks a lot in advance</p>