3-D Shape Measurement by Extraction of Characteristics Using Image Processing

Two merhods for measuring shapes of objects are proposed. One is for convex shape measurement, the other is for cylindrical shape. These methods are based on the sllr-ray projection m e l h d . A thin slit h e m Iigh! emitted from a laser is projected onro the wrface of an ohject. By moving or rotating an object and recording. the images, a three-dimensional i rna~c is constructed, Although conventional analysi~ of a three-dimensional image requires laree mcmory space and lonp processing tinle. This proposcd rnelhod reduces memory space and processing lime. Only two two-dimenqional hrame memories are required. One i s the memory for recording a characteristic vaFuc such as the maximum brightness In each pixel. The other is for recording a datum such a? the dkplaccment of !he object rabEe or !he rotaling angle of the ohjea rabIe when the pixel poinl has the chancteriuic value.