I am new to image J and am trying to automatically count objects in a series of photos. The photos are of a known quadrat space with a number of animals inside. The issue is that the animals (non-linear line segments), are a similar colour to the background. I have attached an example. I cannot seem to figure out how to get ImageJ to deal with this kind of photo because there is very little difference between the objects and the background in terms of colour or intensity (when in grayscale).
Any help would be very appreciated!!