Calibration plate and focusing method for high-speed camera focusing sheet laser plane
A high-speed camera and sheet laser technology, which is applied in image analysis, instruments, televisions, etc., can solve the problems that the laser plane and the high-speed camera focal plane are not completely coincident, the image focal length is inaccurate, and unsatisfactory. The effect of high-speed camera and sheet-like laser plane focusing, avoiding mutual influence
Active Publication Date: 2020-05-05
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
The actual results are unsatisfactory, mainly manifested in: the image focal length positioning is not accurate, single-point focusing can only ensure that a certain point on the image is clearly displayed, while the entire image is blurred, and the laser plane does not completely coincide with the high-speed camera focal length plane
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[0030] The present invention will be further described below through the examples and accompanying drawings, but the protection scope of the present invention should not be limited by this.
[0031] see figure 1 , figure 2 , figure 1 It is a three-dimensional diagram of the high-speed camera focusing sheet laser plane calibration plate of the present invention, figure 2 It is the front view of the calibration plate of the high-speed camera focusing sheet laser plane of the present invention. It can be seen from the figure that the embodiment of the calibration plate of the high-speed camera focusing sheet laser plane of the present invention includes 9 high-transparency glass plates of the same size that are stacked and arranged sequentially and passed through screws. Fixed, each layer of glass is divided into 36 number groups of 6 by 6, each number group is divided into 9 grids of 3 by 3, each layer of glass is engraved with the same number, from the top And the followin...
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The invention provides a calibration board for focusing the plate laser plane of a high-speed camera and a focusing method thereof. The calibration board is composed of nine layers of glass plates with the same size, and the glass plates are mutually fixed by bolts and nuts. Different numbers are engraved on each layer of glass plate. When more than 1 / 2 of the area of the surface of the calibration board presents laser light, the surface of the calibration board coincides with the plate laser plane. The similarities and the differences of the numbers are displayed through the image of the high-speed camera, the angle of the camera is adjusted so that the focal plane is parallel to the plane of the calibration board, and focusing of the focal plane of the high-speed camera and the plate laser plane is completed.
Description
technical field [0001] The invention relates to the field of flow display technology, in particular to a calibration plate and a focusing method for a high-speed camera focusing on a sheet laser plane. Background technique [0002] Flow display technology plays an important role as an experimental means to analyze the flow field structure. The combined use of high-speed cameras and lasers effectively improves the spatial resolution of imaging techniques. However, the sheet light produced by the laser is a non-physical medium, and it is difficult for a high-speed camera to adjust the focus accurately. The pictures taken without precise focus will produce a large number of virtual images and noise backgrounds, which greatly affect the capture of fine structures, which is a constraint. The main factors for the combined use of high-speed cameras and sheet lasers in flow field display technology. [0003] Most of the currently used calibration boards are single-point focus cali...
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IPC IPC(8): H04N17/00G06T7/80
CPCG06T7/80H04N17/002
Inventor 陈方刘洪
Owner SHANGHAI JIAOTONG UNIV