SYSTEM FOR MEASURING LENGTH OF SHEET.

摘要

Four cameras for photographing pictures and strobe light devices, each set at a certain angle to the optical axis of the camera, are provided for taking still-pictures of the four corners of a sheet being carried on a carrier. Four parts for finding the absolute coordinates of the corners of the sheet on the basis of the gray images of the still-pictures. Then, a sheet size calculating part calculates the dimensions in the directions of the length, width and diagonal line of the sheet from the found absolute coordinates.