Large mooring chain five-ring length measurement method and device based on vision
A measurement method and technology of mooring chains, applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of slow response, large data, low precision, etc., and achieve the reduction of system errors, low grid accuracy, and compensation margins The effect of extraction error
Inactive Publication Date: 2012-10-31
SHANGHAI JIAOTONG UNIV
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Although the implementation method of this technology can detect the size of large workpieces, it has many disadvantages, such as large data, slow response, low precision, etc.
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[0035] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.
[0036] The vision-based method for measuring the five-ring length of a large-scale mooring chain involved in this embodiment includes the following steps:
[0037] 1. Place n cameras and n light sources at the specified working distance and working angle, where n cameras and n light sources are installed along the length of the chain, and the cameras and light sources are on the same side of the chain to form foreground lighting. The resolution of the camera is H×V, the focal length of the lens can be fine-tuned, and the brightness of the LED light source can be adjus...
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The invention discloses a large mooring chain five-ring length measurement method and device based on vision, belonging to the technical field of metering. The method comprises: arranging n numbered cameras and n numbered light sources onto appointed working distances and working angles; inputting chain diameter, five-ring length measured by a vernier calliper and the basic parameter of errors excepted; calibrating the base length Lij of adjacent cameras to obtain the base length Li, i+1; calibrating the spatial resolution Ri of each camera along the length line of the chain; and measuring each group of five-ring length of the chains of the same specification. The device is respectively provided with n numbered cameras and n numbered light sources along the length direction of a mooring chain, a base is provided with a turntable which adjusts the working angle of a section bar bracket and is fixed by bolts and nuts; the section bar bracket supports a camera support and a light source support, wherein the camera support is provided with a waist-shaped groove for fixing the camera and adjusting working distance; and the light source support is provided with an arc-shaped groove for adjusting the working angle of the light source. Thus, by means of the invention, the chain edge can be extracted quickly and accurately and the five-ring length can be calculated, and a relative measurement error is controlled to be within 0.2%.
Description
technical field [0001] The invention relates to a measurement method and a measurement device in the field of metering technology, in particular to a vision-based method for measuring the five-ring length of a large mooring chain and a measurement device thereof. Background technique [0002] Machine vision technology comprehensively uses electronics, optics, image processing and computer technology. It has outstanding advantages such as non-contact, fast speed and good flexibility. It is widely used in detecting the position, size and shape of workpieces. [0003] The existing visual measurement system mainly adopts a small-size workpiece measurement method based on a single image and a large-size workpiece measurement method based on multiple image splicing. The single image collected by the former reflects the whole picture of the workpiece to be measured, and the geometric size of the workpiece can be obtained by processing and analyzing the single image. The disadvantag...
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IPC IPC(8): G01B11/02
Inventor 胡文王石刚莫锦秋梁庆华姜银江
Owner SHANGHAI JIAOTONG UNIV