Speed measurement method based on monocular vision system

A monocular vision and speed measurement technology, which is applied in image enhancement, instruments, mechanical equipment, etc., can solve the problems of sensitivity to background environment changes, few practical applications, and complex calculation of optical flow method, so as to improve the accuracy of visual speed measurement and avoid wrong matching , the effect of effective search positioning
CN114580559APending Publication Date: 2022-06-03LIAONING TECHNICAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LIAONING TECHNICAL UNIVERSITY
Publication Date
2022-06-03

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Abstract

The invention discloses a speed measurement method based on a monocular vision system, and belongs to the technical field of machine vision, and the speed measurement method specifically comprises the following steps: (1) carrying out background modeling by using a Gaussian mixture model; (2) acquiring high-precision pixel displacement of the target by using a parameter-optimized template matching method; (3) accurately acquiring a pixel size corresponding to the target to be measured by using an improved two-dimensional measurement model method; (4) calculating the actual speed according to the proportional relation; according to the method, the Gaussian mixture model is fused based on template matching, a foreground extraction effect which is more stable than that of traditional background difference can be obtained by automatically updating a background model for a complex background and the Gaussian mixture model, and then parameter setting of template matching is optimized, so that the matching success rate is further improved; and finally, the pixel size corresponding to the target is accurately obtained by using an improved two-dimensional measurement model method, the actual speed is converted through the proportional relation between the physical size of the target and the pixel size, and the visual speed measurement precision and robustness can be improved.
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Description

technical field

[0001] The invention relates to the technical field of machine vision, in particular to a speed measurement method based on a monocular vision system. Background technique

[0002] With the development of machine vision technology, vision-based target speed measurement has more and more extensive application and development space in the fields of intelligent transportation, industrial production and military; traditional speed measurement methods such as radar speed measurement, ground-sensing coil speed measurement and laser speed measurement need Precise sensor equipment is installed in advance, and there are strict requirements for the surrounding environment during measurement; in contrast, vision-based speed measurement has the advantages of simple equipment installation, low cost, and relatively loose application conditions; but the disadvantage is that it is easily affected by complex backgrounds. Therefore, how to optimize the speed measurement algori...

Claims

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