2017-05-31 06:19:21 -0600 | commented question | Detecting LED/LCD Change Hi LBerger, I can't see how background subtraction would be useful in this application, could you expand a little about how this would detect and LED change please? |
2017-05-22 10:24:06 -0600 | commented answer | Detecting LED/LCD Change Hi Christophe, I am familiar with the histogram, however I am not sure how you are suggesting I use it in this application, are you saying I monitor the histogram of my area of interest every frame and if it changes significantly then the LED/LCD must have changed? Thanks. |
2017-05-18 08:16:46 -0600 | asked a question | Detecting LED/LCD Change 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 |