Build an android app to analyze images for specific object(s)

We want an android app to do the following: Start the app, take a picture of an object that contains up to 2,500 small items that are very similar. One of the objects will be longer than all of the rest of the items if present. The algorithm will need to determine whether the unique item is present and perform the analysis in three seconds or less. If the item is found within the picture taken a beep needs to sound and the item needs to be circled and or roughly colored in. The app must quickly scan the photo and [login to view URL] the [login to view URL] [login to view URL] or not.