Simple example. I have a bird feeder to which birds occasionally come. They are not there all the time. I want to be able to know what birds do come to the feeder and when (time stamp on the photo). What I would like to be able to do is get rid of those photos which have no birds and save the pictures of those which do. In a sense, just the opposite of what the program is made to do.
Some problems, maybe. The feeder is susceptible to some wind action. If the wind moves it, will that in a sense create a new and different picture from the standard even if there is no bird in the picture? Basically, I would like to use my DSLR as a hunter's trail camera and have a rapid way of finding the photos that have only birds in them.