Research on Image Liquid Level Measurement Technology Based on Hough Transform

Based on the camera imaging model and the storage tank measurement environment, the corresponding relationship between the real liquid level height in the image and the liquid level contour radius is deduced in this paper. For the collected images, grayscale and morphological processing are performed first, and the Sobel operator is used for edge recognition. According to the situation, the corrosion calculation is used to reduce the subsequent calculation, and then the circle is detected by the optimized Hough transform to obtain the radius of the circle. Finally, the liquid level information is obtained according to the measurement model. Experimental results show that the maximum absolute error of the system is 2.99mm, and the maximum reference error is 0.75%. The system has certain theoretical and practical significance.