Hi,
I'm looking to start a project that detects an LED changing state or a symbol being displayed on an LCD.
The camera and target would be fixed once setup, think about a user setting up the camera to look at and LCD screen of a device or some flashing LEDs.
I understand this could be very difficult and so my thoughts so far are that everything would be fixed in place and then a reference image is taken. The user could then draw on the image their area of interest and this information would be used to determine a state change.
Given that the image and the area of interest will be known what would be the best algorithm to reliably detect a change of state?
Obviously this algorithm would need to be able to cope with changes in light levels and very slight movement of the target.
Thanks