10 October 1979 Missing-Hole Detection System Using Solid-State Video Cameras
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Abstract
In the manufacture of automobile and truck frames varied patterns of holes of different shapes and sizes are either pierced or drilled in the frame member. Holes that are missing due to broken punches, if undetected, result in extra expense for the automotive customers on their highly automated assembly lines. Conventional means for inspecting for the presence of holes, such as discrete sensors or checking pins, have been impractical because of inflexibility to adapt to annual model changeover in addition to limitation in speed of inspection. An automatic means for 100% inspection of automobile front cross bar assemblies to determine whether the correct number of engine mount holes exist was developed at A. 0. Smith using the solid state video camera as the sensor. Video signals from a pair of cameras focussed to areas of a conveyor line where the assemblies pass are quantized to either black (0) or white (1) signal levels and fed to a specially designed logic system, which performs the following functions: -- Detects that the area of the assembly to be inspected is in the proper position in the camera field of view. -- Processes the binary image in that area by counting a topological property known as the Euler number that corresponds to the number of white "blobs" or "holes". -- Compares the resulting count to a number stored in processor memory for that part to determine acceptance or rejection of part. System has been on-line since February, 1978, operating in a harsh manufacturing environment.
© (1979) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
D. J. Kopydlowski "Missing-Hole Detection System Using Solid-State Video Cameras", Proc. SPIE 0182, Imaging Applications for Automated Industrial Inspection and Assembly, (10 October 1979); doi: 10.1117/12.957379; https://doi.org/10.1117/12.957379
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