An algorithm for inspecting the dimensions of automotive body panels using a three-dimensional (3-D) vision sensor has been developed, together with an inspecting system based on this algorithm. The slit light of the 3-D vision sensor is projected onto the body panel and the reference block which gives reference coordinates. In order to measure the gap and flushness between the panel and the block, this algorithm estimates the edge of the bent panel by fitting a circle on the image from the sensor. Further the image is improved by controlling both the projection angle and brightness of the slit light, when the disconnected slit light image is obtained.
The system measured the gap and flushness with accuracy to ±0.15mm in the experiments and proved effective for the inspection of panel dimensions.
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