I have a series of images obtained from a microscope as follows
I need to create a series of filters that would isolate the centre section on the yellow droplet.(This is highlighted by the bright yellow circle area), and remove all the noise and other pictures. I tried using just RGB channel threshold but its not working. Also ambient light may also change so I am not getting a consistent output. Can anyone provide a MWE for the workflow of the filter required in MATLAB to achieve this?