A large-scale visual measurement system based on a monocular camera and its calibration method
A visual measurement and large-scale technology, which is applied in the directions of measuring devices, photogrammetry/video metrology, surveying and navigation, etc., can solve the problems that the measured objects cannot be marked or marked dangerously, and the workload is huge, reaching a wide range of markets Effects of Value and Applied Value
Active Publication Date: 2019-07-16
KUNMING UNIV OF SCI & TECH
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Problems solved by technology
[0002] At present, the measurement equipment on the market can measure the details of small measured objects very well, but most of the measurement of large objects can only achieve the external dimension measurement with obvious geometric features (laser tracker), or the measurement process needs to mark a large number of obvious Marking points make the workload very large, and some measured objects cannot be marked or marked very dangerous. Therefore, the present invention is a large-scale visual measurement system and calibration method based on a monocular camera; it can be applied to large-scale measured objects as a whole and The measurement of detail size has a very broad market space
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Embodiment 1
[0030] Embodiment 1: as Figure 1-4 As shown, a large-scale visual measurement system based on a monocular camera includes a monocular camera that can be manually adjusted and fixed, a tripod, structural accessories, a special calibration plate, a laser tracking measurement device, and a user computer. The camera is installed on a triangle On the rack, the structural accessories are installed above the camera. There are at least three small cylinders with different heights on the structural accessories. The small cylinders are perpendicular to the upper surface of the camera. Calibration points, the body of the special calibration plate is designed as a rectangular plate, the upper part of the rectangular plate is a flat mirror, and the left surface of the lower part of the rectangular plate is provided with a standard checkerboard grid, and the special calibration plate is placed in front of the camera , the laser tracking measurement device is placed at the origin of the wor...
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The invention relates to a large-size vision measurement system based on a monocular camera and a calibration method of the large-size vision measurement system, and belongs to the technical field of computer vision measurement. The measurement system comprises a fixed monocular camera with the manually adjustable camera focal length, a tripod, a structure accessory, a special calibration plate, a laser tracking measurement device and a user computer. The camera is installed on the tripod. The structure accessory is installed on the camera. The calibration method comprises steps of designing and manufacturing the structure accessory which can be integrated into the camera and the like. According to the invention, the by designing the special calibration plate, through obvious marking points on the camera, by use of the provided measurement system and the calibration method provided by Zhang Zhengyou, calibration of the distance between a lens and the light center during continuous measurement of the monocular camera in any space position is achieved, so the whole and detail sizes of a large to-be-measured object can be measured.
Description
technical field [0001] The invention relates to a large-scale visual measurement system based on a monocular camera and a calibration method thereof, belonging to the technical field of computer vision measurement. Background technique [0002] At present, the measurement equipment on the market can measure the details of small measured objects very well, but most of the measurement of large objects can only achieve the external dimension measurement with obvious geometric features (laser tracker), or the measurement process needs to mark a large number of obvious Marking points make the workload very large, and some measured objects cannot be marked or marked very dangerous. Therefore, the present invention is a large-scale visual measurement system and calibration method based on a monocular camera; it can be applied to large-scale measured objects as a whole and The measurement of detail size has a very broad market space. Contents of the invention [0003] The technic...
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IPC IPC(8): G01B11/00G01C11/00
CPCG01B11/00G01C11/00
Inventor 李文国杨其乐陈田
Owner KUNMING UNIV OF SCI & TECH