Method and measuring device for measuring a rotary tool

Method for measuring a rotary tool using a measuring device, the rotary tool being rotatable about a rotation axis and being mounted in a tool mounting with the rotary tool comprising a tool contour determining the working dimensions of the rotary tool;

• the measuring device comprising an optoelectronic image acquisition device including optics alignable with the rotary tool for acquiring images of the rotary tool, further comprising an image processing device connected to the image acquisition device for the computer-aided evaluation of acquired images, the method involving the following steps:
• placing the area of the tool contour to be measured in an image area of the optics of the optoelectronics image acquisition device;
• rotating the rotary tool about the rotation axis;
• acquiring a sequence of frames of the rotating rotary tool;
• computer-aided evaluation of the frames with respect to at least one image parameter, the image parameter representing a measure for the positioning of the tool contour with respect to a sharpness zone of the optics;
• determining a selection frame by computer-aided selection of a frame from the sequence of frames, in which frame the image parameter corresponds to a positioning of the tool contour in the sharpness zone of the optics;
• evaluation of the selection frame for determining at least one tool parameter characterizing the tool contour.