Abstract: A method and apparatus is provided for controlling the laser cutting of a laser beam machine by image processing techniques. A photographing device is provided to photograph a pattern or material object and to obtain a pattern image. According to the pattern, an article is cut by the laser beam machine. The photographed pattern image is digitized and stored in an image processing card. In turn, by using image processing techniques, the digitized pattern image is thresholded, and contours and/or skeletons are extracted therefrom. Each of the extracted contours and/or skeletons is linked point by point to form a series of characteristic points, and the linked lines are stored in a memory device of a microcomputer. The linked lines are replaced by a plurality of vector points in a curve approximation process, and the vector points for each linked line form a series of line vector data.

Abstract: The invention relates to an improved construction for a cylinder lock and key, more particularly to a cylinder lock which has a plurality of pin tumblers of different lengths and diameters arranged radially about the axis of a rotatable cylinder, a pin tumbler longitudinally provided at the rear end of a stationary cylinder, a ball being further provided between said rotatable cylinder and stationary cylinder, and a matching key which comprises a tubular shank having thereon a plurality of depressions corresponding to said radially arranged pin tumblers.