A device and method for measuring surface height information based on monocular vision
A technology of height information and measuring device, applied in the direction of measuring device, using optical devices, instruments, etc., can solve the problems of difficult to use effectively, unable to obtain deformation information of the measured object, etc., to achieve strong applicability, improved accuracy, and reduced measurement data. Effect
Active Publication Date: 2019-11-22
HUAZHONG UNIV OF SCI & TECH
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[0004] However, further studies have shown that the above-mentioned existing solutions are only suitable for the measurement of planar objects, and it is difficult to use them effectively in the application of curved surface object measurement; in particular, it can only measure the distance information from the measured object to the camera, but cannot Obtain the deformation information of the measured object in the out-of-plane direction, which is a very critical indicator for surface measurement applications
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[0047] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0048] figure 1 It is a schematic diagram of the overall structure of the monocular vision-based surface height information measuring device constructed according to the preferred embodiment of the present invention, figure 2 Yes figure 1 The schematic diagram of the specific layout of the measurement rack and the parallel light source assembly, distance sensor and detection camera installed ...
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The invention belongs to the field related to machine vision imaging technology and discloses a curved surface height information measuring device and method based on monocular vision. The device comprises a measuring frame, a parallel light source component, a detection camera and a distance sensor. The parallel light source assembly is composed of a mounting box, a collimator and a transmission grating, and the transmission grating is engraved with nicks which are uniformly spaced, so that the parallel light beam emitted by the collimator can be projected on the to-be-measured curved surface to form light and dark parallel stripes. In addition, the number of detection camera is only one, and the detection camera cooperates with the parallel light source component, thereby performing image acquisition on the parallel stripes formed on the to-be-measured curved surface to obtain an image. The invention also discloses a corresponding curved surface height information measuring method. According to the invention, curved surface height information measurement can be highly efficiently completed with only one camera; the overall structure is compact and reasonable; the operation is convenient; the adaptability is high; and meanwhile the measurement precision which can be finally obtained is substantially raised.
Description
technical field [0001] The invention belongs to the related field of machine vision imaging technology, and more specifically relates to a device and method for measuring curved surface height information based on monocular vision. Background technique [0002] In vision technology, in order to measure the height information of a curved surface, at least multiple images of the measured curved surface need to be obtained from multiple angles. Existing methods usually use two or more cameras to collect images, and use geometric constraints to obtain three-dimensional information of the measured surface; or use only one camera to collect images from multiple angles. However, for the former, since it is necessary to use multiple cameras, while increasing the cost, there is also the problem of very cumbersome calibration of the internal and external parameters of the camera in a multi-camera system, and it often has a great impact on the final measurement accuracy. For the latte...
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IPC IPC(8): G01B11/06
CPCG01B11/0608
Inventor 陈建魁朱育飞
Owner HUAZHONG UNIV OF SCI & TECH