This paper discusses a camera self-test method for liquid level image calibration.Experiments show that the proposed method,based on SIFT feature point extraction of YOLOv4 target detection and FLANN matching dis-placement measurement algorithm,can achieve more accurate target displacement measurement,which can not only deal with the slight disturbance that may occur in daily use of the camera,but also effectively detect the camera dis-turbance to ensure the accuracy and stability of liquid level detection.
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