Battery case dimension measurement based on improved canny

Abstract

The battery case is the core part of a lithium battery, the quality requirements are extremely high, and its size measurement is easily affected by personal factors, resulting in human-controlled errors. A method based on the improved Canny operator is proposed to aim at the problems of low efficiency and high cost in the dimension measurement of the bottom and top of the battery case. Firstly, the image acquisition system is designed to complete the construction of the hardware platform, the camera calibration is achieved in Halcon, RGB processes the image to greyscale and grey value enhancement is used to increase the image contrast, and the improved bilateral filter denoising performs the edge detection, the threshold segmentation and the improved Canny operator to achieve the sub-pixel level size measurement and ensure the accuracy of the edge positioning. Comparison experiments show that the absolute error of the top and bottom diameters of the battery case measured by the algorithm in this paper is less than 0.007 mm, the relative error is less than 0.06 %, and the average error is within 0.0068 mm and 0.0064 mm, respectively. The measurement speed is only about 200 ms, which is much faster than that of the manual measurement of more than 7 s, and it meets the requirements of industrial applications.