Testing technology for Functional test

Solutions for functional testing with image processing are customer-specific image processing systems used for non-contact optical 100% functional testing. Exemplary checks determine if self-luminous devices are functioning and show the correct color, if there are pixel errors on displays, or if display elements report correct values. Controls of mechanically movable assemblies are based on the determination of start and final positions as well as the correct approach of predetermined positions. Typical test items are displays, control panels, vehicle instrument panels, speed and speedometers and head-up displays. Further applications include the control of fully assembled manometers or the functional testing of vehicle adjustment systems such as sunroofs. The specimens are positioned in a defined distance in the field of view in front of one or more cameras, fixed, electrically contacted or mechanically adapted and operated. In order to avoid disturbing light influences from the environment, the examination of self-luminous objects can be carried out in a darkened or light-tight sealable test chamber. On the other hand, additional lighting may be required to test mechanically moving objects. The evaluation of the acquired images takes place with application-specific programmed evaluation algorithms. In the simplest case, it is checked whether a light element is light or dark. Furthermore, the presence of certain features, edges, dimensions, shapes, arches, shades or even colors and color surfaces can be checked. Functional testing of turning and indicating instruments or mechanically moving assemblies takes place via the detection of angles and paths or by comparing start and final position. After a comparison with the preprogrammed set points or by checking the permissible tolerances, a test decision is made. Image processing solutions may also include other application-specific functions such as adjustments, assembly inspection or optical character reading. Solutions usually include application-specific cameras with objective lenses, light shields and/or lighting as well as a powerful evaluation computer with the application-specific evaluation software. Suppliers offer software programming, application consulting as well as assembly and commissioning from one source only.