Multi-camera dimension detector for mobile phone window protecting screen and method

The invention discloses a multi-camera dimension detector for a mobile phone window protecting screen and a method. The mobile phone window protecting screen is placed on an objective table of a Y worktable of a precise XY worktable, four demarcated CCD (charge coupled device) cameras are mounted on four corners of the mobile phone window protecting screen, a red coaxial light source is mounted under each camera, the four cameras are respectively connected with a video acquisition card which is mounted on a computer, and the rotation speed of a motor of the precise XY worktable is controlled by a driver which is connected with the computer. The four cameras are used with the precise XY worktable and shoot images at different measurement points, images are processed by a method of machine vision, the quality of products is judged by means of calculating the length, the width, the round corner radians and the radius of the mobile phone window protecting screen, and problems that detection modes of manual operation, projection and the like are low in speed and precision are resolved.