Intelligent detection method for size of running gear of high-speed rail motor train unit

The invention discloses an intelligent detection method for the size of a running gear of a high-speed rail motor train unit. The method comprises the following steps: constructing an image acquisition platform; obtaining a corresponding relation between the image pixel and the real size; calling a camera by using light source hardware information to collect and store images; image graying processing is carried out, a color image is converted into a gray-scale image, image tone and saturation information is eliminated, brightness is kept, and the RGB image or the color image is converted into the gray-scale image to achieve the graying processing function; smoothing filtering processing is carried out on the grey-scale map by using adaptive median filtering, and noise points of the image are reduced; carrying out sharpening filtering processing on the image; carrying out edge detection on the image by using an improved Canny operator; fitting the boundary shape of the discontinuity points by using Hough trans