An electrical-optical coupling and detecting device. The frame assemblies are secured to side walls of the container and act in pairs to extend from respective sides and join together to form bracing barriers extending across the width of the container. Pixels are determined to be foreground or background based on the comparisons. The mounting points are configured to allow for stability and flexibility. The first parameter is considered equivalent to the lower value if the two unreliable counts differ less than or equal to a count difference.