Method for measuring diagonal length of square steel plate based on machine vision

The invention discloses a square steel plate diagonal length measurement method based on machine vision, which comprises the steps of pixel calibration, acquisition and labeling, algorithm training, angular point processing, measurement and calculation, regression and error correction, training an error model y = f (x) according to a relation between a measured value and a true value, x being a measured value, y being a final output value, and f (x) being an error model; the pixel difference obtained in the step 5) serves as x to be input into an error model, and the pixel difference after regression error correction is obtained; and calculating the size of the square steel plate by combining the pixel difference after regression error correction with the distance represented by each pixel obtained in the step 1). Compared with a traditional measurement method, the method is more intelligent, a machine vision scheme and a deep learning method are combined, measurement is simpler and more friendly, and the met