A mobile apparatus is provided that includes an image sensor for converting an optical image into an electrical signal. The optical image includes an image of a vehicle license plate. The mobile apparatus includes a license plate detector configured to process the electrical signal to recover information from the vehicle license plate image. Upon capturing of the video that includes the image, a device operation instructor will dynamically determine a highest score of assigned object image scores for each frame of the video generate an operation adjustment control if the determined highest score is less than a predetermined score threshold, which is in turn dynamically displayed during continuous capture of the video by the image sensor.