A Two-step Method for Circular Mark Leakage Detection on High-Speed Moving Targets
A technology of circular marking and detection method, which is applied to measuring devices, instruments, and optical devices, etc., can solve the problems of low detection accuracy and low detection accuracy, and achieve the effects of high accuracy, good stability, and improved leakage point positioning accuracy.
Active Publication Date: 2019-08-23
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology
[0004] The purpose of the present invention is to provide a two-step method based on a circular mark leakage point detection method on a high-speed moving target, aiming to solve the problem that the image of a circular mark point on a high-speed moving target is often collected under the condition of underexposure. There are problems of missed detection and low accuracy for circular mark point detection
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[0027] The present invention adopts such as figure 1 The flow chart of the circular mark leak detection method on the high-speed moving target based on the two-step method is shown to realize the circular mark leak detection. The specific implementation steps are as follows:
[0028] 1) Circular mark point image acquisition
[0029] The embodiment of the present invention adopts two industrial cameras (resolution is 2048 * 1088, frame rate is 340f / s, interface is Camera link, shutter mode is global shutter) that adopts two German production models to be BASLER acA2000-340km to form stereo vision system, The MF-2000 photographic light array is used to form the lighting system of the Ness LED model, and the circular marking points are pasted on the helicopter rotor blades. The schematic diagram is as follows figure 2 As shown in the figure, the largest circular mark point in the figure is the positioning circle, and the other circles are mark points. When the helicopter rotor...
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A method for detecting missing points of circular markers on a high-speed moving target based on a two-step method, comprising the steps of: 1) image acquisition of circular markers on a high-speed moving target; 2) image edge detection; 3) detection of circular markers; 4 ) Coarse positioning of leaks; 5) Fine positioning of leaks. The advantages of the present invention are: using the known positional relationship and size between the circular marking points, the rough positioning of the missing points of the circular markings is realized; the precise positioning of the missing points of the circular markings is realized by the twice least square circle fitting method, and singularities are removed Edge points improve the positioning accuracy of leak points. The present invention can be used to realize three-dimensional information measurement of high-speed moving objects based on stereo vision by using marking points, and has the characteristics of high precision and good stability. position.
Description
technical field [0001] The invention relates to the technical field of stereo vision measurement, in particular to a two-step method for detecting missing points of circular marks on high-speed moving targets. Background technique [0002] Circular markers have the characteristics of obvious features and insensitivity to noise. They are often used as feature points in stereo vision measurement methods, avoiding the difficulty of feature point extraction and matching in three-dimensional information measurement. They are widely used in pattern recognition, computer Fields of Vision and Biology. [0003] There are three kinds of existing circular marker point detection methods: (1) grayscale centroid method, is to utilize the grayscale value of area pixel in the image, and utilizes center of gravity formula to obtain centroid, for simple background and high-quality image, such The detection accuracy of circular markers is high, but the detection effect is not good for complex...
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IPC IPC(8): G01B11/00G01B11/24
Inventor 熊邦书欧巧凤熊磊雷鸰莫燕
Owner NANCHANG HANGKONG UNIVERSITY