CN110595364A - Space displacement and strain measuring device and method based on CCD camera - Google Patents
Space displacement and strain measuring device and method based on CCD camera Download PDFInfo
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- CN110595364A CN110595364A CN201910809508.9A CN201910809508A CN110595364A CN 110595364 A CN110595364 A CN 110595364A CN 201910809508 A CN201910809508 A CN 201910809508A CN 110595364 A CN110595364 A CN 110595364A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
Abstract
The invention discloses a device and a method for measuring space displacement and strain based on a CCD (charge coupled device) camera, which comprises a CCD color camera, a first spectroscope, a second spectroscope, a first reflector, a second reflector and a third reflector; the first reflector, the first spectroscope and the second spectroscope form a first optical path, the second reflector and the first spectroscope form a second optical path, and the third reflector, the second spectroscope and the first spectroscope form a third optical path; the first light path, the second light path and the third light path all enter the CCD color camera; the CCD color camera is used for shooting through the first light path, the second light path and the third light path. The device has a simple structure, does not need any synchronous trigger device to realize synchronous data acquisition, is equivalent to shooting from three directions by adopting three CCD cameras, and ensures that the calculation result is more accurate.
Description
Technical Field
The invention relates to the field of optical measurement, in particular to a device and a method for measuring spatial displacement and strain based on a CCD camera.
Background
Since the advent of digital image correlation methods in 1980, the methods have been rapidly developed. In order to measure spatial displacement and strain, researchers have proposed methods of correlating spatial digital images. This approach has many advantages, such as: full-field, high precision, non-contact, insensitivity to measurement environment and the like, so that the method is applied to many fields of displacement and strain measurement. Two CCD cameras are needed in the traditional space digital image correlation, so that the hardware cost is high, and a synchronous trigger device is also needed to be provided for realizing the simultaneous work of the two cameras, so that the operation complexity is high.
At present, the invention patent with publication number CN103940357A discloses a non-contact spatial displacement measuring device, which comprises a laser range finder arranged at a reference point, an imaging transparent plate arranged at a detection point, an image acquisition device arranged at one side of the imaging transparent plate opposite to the laser range finder, a driving module and a control module, and the measuring device has the following disadvantages: 1. the laser range finder has high cost, large volume and inconvenient carrying; 2. only one light path reaches the sensor during shooting, and reference point information may be lost.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a device and a method for measuring spatial displacement and strain based on a CCD camera.
The first technical scheme adopted by the invention is as follows: the CCD color camera comprises a CCD color camera, a first spectroscope, a second spectroscope, a first reflector, a second reflector and a third reflector;
the first reflector, the first spectroscope and the second spectroscope form a first optical path, the second reflector and the first spectroscope form a second optical path, and the third reflector, the second spectroscope and the first spectroscope form a third optical path; the first light path, the second light path and the third light path all enter the CCD color camera;
the CCD color camera is used for shooting through the first light path, the second light path and the third light path so as to obtain a target image.
Furthermore, the filter also comprises a first filter, a second filter and a third filter;
the first filter is arranged in the first light path and is used for filtering the first light path so as to obtain first color light;
the second filter is arranged in the second light path and is used for filtering the second light path so as to obtain second color light;
and the third filter plate is arranged in the third light path and is used for filtering the third light path so as to obtain third color light.
Further, the device also comprises a first light source, a second light source and a third light source;
the first light source has the same light emitting color as the first color light, the second light source has the same light emitting color as the second color light, the third light source has the same light emitting color as the third color light, and the first light source, the second light source and the third light source are all used for supplementing light for shooting of the CCD color camera.
Furthermore, the first spectroscope is provided with a first input end, a second input end and a first output end, and the second spectroscope is provided with a third input end, a fourth input end and a second output end;
the first input end is used for receiving the light reflected by the second reflector, so that the first spectroscope is subjected to light splitting according to a preset first light splitting ratio and then outputs the light to the CCD color camera through the first output end;
the third input end is used for receiving the light reflected by the first reflector, so that the second spectroscope is split according to a preset second splitting ratio and then outputs the light to the second input end through the second output end, and the first spectroscope is split according to a preset first splitting ratio and then outputs the light to the CCD color camera through the first output end;
the fourth input end is used for receiving the light reflected by the third reflector, so that the second spectroscope is split according to a preset second splitting ratio and then outputs the split light to the second input end through the second output end, and the first spectroscope is split according to a preset first splitting ratio and then outputs the split light to the CCD color camera through the first output end.
Further, the CCD color camera is connected to a computer 14 having an image processing function through a data line, and the computer 14 is configured to extract features of the target image and record coordinate positions of pixel points in the target image, thereby calculating a displacement variable.
The second technical scheme adopted by the invention is as follows:
a method for measuring spatial displacement and strain comprises the following steps:
positioning characteristic points on the surface of a measured object;
and continuously shooting the characteristic points along the first light path, the second light path and the third light path for multiple times so as to obtain multiple target images.
Further, the method also comprises the following steps:
filtering the light of the first light path by using the first filter to obtain first color light; and filtering the light of the second light path by using the second filter to obtain second colored light, and filtering the light of the third light path by using the third filter to obtain third colored light.
Further, the method also comprises the following steps:
and supplementing light for shooting of the camera by using the first light source, the second light source and the third light source according to the color of the object to be measured and the color of the surrounding environment background.
Further, the method also comprises the following steps:
changing the reflection direction of the first reflector so as to change the path of the first light path;
changing the reflection direction of the second mirror, thereby changing the path of the second optical path;
the reflecting direction of the third reflecting mirror is changed, so that the path of the third light path is changed.
Further, the method also comprises the following steps:
selecting one image from each target image as a reference image, and selecting the rest target images as comparison images;
extracting the features of the reference image, loading the features into a database, comparing the features of the comparison image, loading the two-dimensional position information of the image where each pixel of the reference image is located into the database to form original position information, and setting a displacement alarm threshold;
sequentially comparing the characteristics of the comparison image with the characteristics in the database, and extracting two-dimensional position data of the image where each pixel is located in the comparison image to form real-time position information;
and calculating the two-dimensional position distance of each real-time position information and the image where the original position information is located, and determining that the characteristic point generates displacement when the difference value of the two-dimensional position distances is greater than a displacement alarm threshold value.
The invention has the beneficial effects that: the single CCD color camera space digital image related displacement strain measuring instrument can realize space measurement only by using one camera and does not need any synchronous trigger device to realize synchronous data acquisition, so that the light path structure is more compact, and compared with the traditional double cameras for measuring the space data image related displacement and strain, the invention equivalently adopts three CCD cameras to shoot from three directions, so that the calculation result is more accurate, and the invention has no any limitation on the shape of the surface of the object to be measured and is flexible to apply.
Drawings
FIG. 1 is a block diagram of an embodiment of a spatial displacement and strain measurement apparatus according to the present invention;
1. an object to be measured; 2. a CCD color camera; 3. a first beam splitter; 4. a second spectroscope; 5. a first reflector; 6. a second reflector; 7. a third reflector; 8. a first filter; 9. a second filter; 10. a third filter; 11. a first light source; 12. a second light source; 13. a third light source; 14. and (4) a computer.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
FIG. 1 is a block diagram of an embodiment of the present invention. The shape of the surface of the object 1 to be measured does not influence the application of the invention, and both a plane and a curved surface can be measured by the invention.
In fig. 1, a CCD camera-based spatial displacement and strain measuring device includes a CCD color camera 2, a first beam splitter 3, a second beam splitter 4, a first reflector 5, a second reflector 6, and a third reflector 7; the first reflector 5, the first beam splitter 3 and the second beam splitter 4 form a first optical path; the second reflector 6 and the first spectroscope 3 form a second optical path; the third reflector 7, the second beam splitter 4 and the first reflector 5 form a third optical path. The first light path, the second light path and the third light path enter the CCD color camera 2 after light convergence. The CCD color camera 2 is used for shooting through the first light path, the second light path and the third light path so as to obtain a target image.
For the above-mentioned measuring device, its theory of operation does: when a CCD color camera is used for photographing the characteristic points on the object 1 to be measured, the CCD color camera can convert image pixels into digital signals and can be used for respectively collecting different colors because the CCD color camera internally comprises three independent CCD chips, each CCD chip can form a bitmap with a plurality of pixels, and the bitmaps of a plurality of different channels are combined to realize color imaging; through setting up three different light paths and gathering different colours, can realize the shooting to same object different angles simultaneously, obtain the information of more characteristic points.
Further as a preferred embodiment, the filter further comprises a first filter 8, a second filter 9, and a third filter 10;
the first filter 8 is arranged in the first light path and is used for filtering the first light path, and the filter selectively absorbs colors with different wavelengths to obtain first color light;
the second filter 9 is arranged in the second light path and is used for filtering the second light path, and the filter selectively absorbs colors with different wavelengths to obtain second colored light;
the third filter 10 is disposed in the third light path and is configured to filter the third light path, and the filter selectively absorbs colors with different wavelengths to obtain third color light;
the light is filtered by the first filter 8, the second filter 9 and the third filter 10 and then enters the first spectroscope 3 and the second spectroscope 4 for light splitting;
the filter is generally made by adding special fuel into a glass sheet, the original glass sheet is transparent, the refractive index of the filter is originally almost the same as that of air, all colored light can pass through the filter, but after the filter is dyed with dye, the molecular structure is changed, the refractive index is changed, and the passing of certain colored light is changed; for example, a white light beam passes through a blue filter, a blue light beam is emitted, and the green light and the red light beams are few and are mostly absorbed by the filter, so that the filter can selectively allow light of a certain color to pass through, and the desired color is highlighted.
Further, as a preferred embodiment, the light source device further includes a first light source 11, a second light source 12, and a third light source 13; the first light source 11 has a light emitting color same as the first color light, the second light source 12 has a light emitting color same as the second color light, the third light source 13 has a light emitting color same as the third color light, and the first light source 11, the second light source 12, and the third light source 13 are all used for supplementing light for shooting by the CCD color camera 2.
When carrying out image shooting, whether the light of surrounding environment is sufficient directly influences the shooting effect, and luminance can make the shooting formation of image fuzzy inadequately, so it is necessary to use the light source to carry out the light filling to testee 1. The light sources can be adjusted according to the color of the surface of the object 1 to be measured and the actual conditions of the surrounding environment to see whether a certain light source is turned off or the brightness of the certain light source is improved, so that the best shooting effect is achieved.
Further as a preferred embodiment, the first beam splitter 3 is provided with a first input end, a second input end and a first output end, and the second beam splitter 4 is provided with a third input end, a fourth input end and a second output end; the first input end is used for receiving the light reflected by the second reflector, so that the first spectroscope 3 is split according to a preset first splitting ratio and then outputs the light to the CCD color camera through the first output end; the third input end is used for receiving the light reflected by the first reflector, so that the second spectroscope 4 is split according to a preset second splitting ratio and then outputs the light to the second input end through the second output end, and the first spectroscope 3 is split according to a preset first splitting ratio and then outputs the light to the CCD color camera 2 through the first output end;
in optical detection, the spectroscope mainly uses the light splitting characteristic thereof to enable the light rays input into the spectroscope to be transmitted and reflected, and the main performance indexes of the spectroscope comprise the splitting ratio, the total energy of transmission and reflection; the color of the light passing through the spectroscope is not changed, but the intensity of the light passing through the spectroscope can be adjusted, part of the light is allowed to enter the CCD color camera after being transmitted, and the proportion of transmission and reflection can be controlled by adjusting the distance and the angle of the spectroscope.
Further as a preferred embodiment, the CCD color camera 2 is connected to a computer 14 with an image processing function through a data line, and the computer 14 is configured to extract features of the target image and record coordinate positions of pixel points in the target image, thereby calculating a displacement variable.
Selecting characteristic points before displacement measurement, and continuously shooting a plurality of images for the characteristic points by the CCD color camera 2 for a plurality of times; selecting one image as a reference image and selecting other images as target images; carrying out distortion correction on the image by utilizing the camera calibration parameters; extracting the information of the characteristic points of the reference image after distortion correction and storing the information into a database, wherein the information comprises two-dimensional position information of each pixel point in the reference image;
setting a displacement alarm threshold d1；
And extracting the characteristic points of the target image after distortion correction, storing the characteristic points into a database, including the two-dimensional position information of each pixel point in the target image, and then matching the characteristic points with the characteristic points of the reference image after distortion correction. For the extracted matching feature points, converting the extracted matching feature points from pixel coordinates to world coordinates, wherein the conversion calculation formula is as follows:
wherein Z iscAs the Z coordinate of the point in the camera coordinate system, [ u v 1 ]]TAs coordinates of the point in the image coordinate system, fx、fyIs the focal length u0And v0Is the principal point coordinate, R is a rotation matrix of 3X 3, T is a translation vector of 3X 1, [ X ]w Yw Zw 1]TAre the coordinates of points in a world coordinate system. ZcObtained from camera calibration external reference, [ u v 1 ]]TTo match the pixel coordinates of the feature points, fx、fy、u0、v0Obtaining from camera calibration internal reference external reference, R, T from camera calibration external reference;
in order to obtain the condition of linear displacement, orthogonal decomposition is carried out on the displacement of the characteristic points;
displacement example calculation is carried out through a distance formula, and the calculation formula is as follows:
wherein d is the distance between two points, (X)1，Y1，Z1) As three-dimensional world coordinates of feature points in the reference image, (X)2，Y2，Z2) Comparing three-dimensional world coordinates of the feature points in the image; obtaining a calculation result d of the matched feature points through a calculation formula, wherein the calculation result d is equal to an alarm threshold value d1Comparing, when d is>d1I.e. displaced when d ≦ d1No displacement occurs.
A detailed description of one embodiment of the apparatus of the present invention will now be given.
In this case, the CCD color camera is a CCD color camera 2 having 3 CCD chips; the first spectroscope 3 is a prismatic first spectroscope, and the second spectroscope 4 is a prismatic second spectroscope; the first reflector 5 is a first plane reflector with a plane surface, the second reflector 6 is a second plane reflector with a plane surface, and the third reflector 7 is a third plane reflector with a plane surface; the first filter 8 is a green light filter, the second filter 9 is a red light filter, and the third filter 10 is a blue light filter; the first light source 11, the second light source 12 and the third light source 13 respectively use LED lamps as a first LED light source, a second LED light source and a third LED light source.
Because the CCD color camera is least sensitive to red, red overflow is easily caused, and the phenomenon that the red in the picture is too bright and loses details and levels is caused, so in this case, two spectroscopes are used to split red light twice, the intensity of red light reaching the CCD color camera 2 is weakened, and green light and blue light only need to be transmitted once through the spectroscopes.
The method comprises the following steps that an object to be measured 1 is irradiated by a first light source 11, a second light source 12 and a third light source 13 for light supplement, light is reflected by characteristic points of the object to be measured 1 to form first reflected light, the first reflected light is filtered by a first filter 8 to obtain green light, the green light is reflected by a first reflector 5, the reflected light enters a second spectroscope 4, the second spectroscope 4 splits the light according to a second splitting ratio and then enters a first spectroscope 3, the first spectroscope 3 splits the light according to the first splitting ratio and then outputs the split light to a CCD color camera 2, and the split light is collected by a corresponding CCD chip in the CCD color camera 2;
the light is reflected by the characteristic points of the object 1 to be measured to form second reflected light, the second reflected light is filtered by a second filter 9 to obtain red light, the red light is reflected by a second reflecting mirror 6, the reflected light enters a first spectroscope 3, is split by the first spectroscope 3 according to a first splitting ratio and then is output to a CCD color camera 2, and is collected by a corresponding CCD chip in the CCD color camera 2;
the light is reflected by the characteristic point of the measured object 1 and then forms third reflected light, the third reflected light is filtered by a third filter 10 to obtain blue light, the blue light is reflected by a third reflector 7, the reflected light enters a second spectroscope 4, the second spectroscope 4 splits the light according to a second splitting ratio and then enters a first spectroscope 3, the first spectroscope 3 splits the light according to the first splitting ratio and then outputs the light to a CCD color camera 2, the light is collected by a corresponding CCD chip in the CCD color camera 2, 3 CCD chips are subjected to photoelectric conversion, and an image is generated after circuit processing.
In order to obtain the best test effect, the second light source 12 is placed on the normal line of the characteristic point on the surface of the object to be tested 1, the first light source 11 and the third light source 13 are respectively placed on two sides of the normal line, the connecting line of the first light source 11 and the characteristic point and the connecting line of the third light source 13 and the characteristic point respectively form an included angle of 30 degrees with the normal line of the characteristic point, and the first light source 11, the second light source 12 and the third light source 13 are 1.5 meters to 2.5 meters away from the object to be tested.
In order to ensure the shooting effect, the first light source 11, the second light source 12 and the third light source 13 can be adjusted to supplement light to the object to be measured 1, for example, the surface of the object to be measured 1 is coated with red pigment, the surrounding color is darker, and in order to distinguish the characteristic points on the object to be measured 1 more easily, the first light source 11 or the third light source 13 is turned on at the moment, so that the contrast between the characteristic points and the surrounding of the characteristic points is more obvious, and the shot image is clearer.
During continuous multiple shooting, the shooting angle of the CCD color camera 2 can be finely adjusted, the first light path, the second light path and the third light path can be changed by respectively adjusting the placing angles and the front and back positions of the first reflector 5, the second planar reflector and the third reflector 7, and each light path can be seen as shooting the measured object 1 once from a certain angle.
The flow of an embodiment of the method of the present invention will now be described.
Selecting a certain position on the surface of a measured object as a characteristic point;
secondly, the space displacement and strain measuring device based on the CCD camera is placed, and a placed platform can be a base or a hanging bracket;
turning on the LED light source, adjusting the brightness and color of the LED light source, and adjusting the angle of the reflector to enable the CCD color camera to capture a clear target image;
fourthly, continuously shooting the measured point for multiple times by using a CCD color camera, and storing the image;
the CCD color camera is connected with a computer with an image processing function through a data line, the computer performs feature extraction and analysis on a plurality of images, and the specific processing process is as follows:
selecting characteristic points before displacement measurement, and continuously shooting a plurality of images for the characteristic points by the CCD color camera 2 for a plurality of times; selecting one image as a reference image and selecting other images as target images; carrying out distortion correction on the image by utilizing the camera calibration parameters; extracting the information of the characteristic points of the reference image after distortion correction and storing the information into a database, wherein the information comprises two-dimensional position information of each pixel point in the reference image;
setting a displacement alarm threshold d1；
And extracting the characteristic points of the target image after distortion correction, storing the characteristic points into a database, including the two-dimensional position information of each pixel point in the target image, and then matching the characteristic points with the characteristic points of the reference image after distortion correction. For the extracted matching feature points, converting the extracted matching feature points from pixel coordinates to world coordinates, wherein the conversion calculation formula is as follows:
wherein Z iscAs the Z coordinate of the point in the camera coordinate system, [ u v 1 ]]TAs coordinates of the point in the image coordinate system, fx、fyIs the focal length u0And v0Is the principal point coordinate, R is a rotation matrix of 3X 3, T is a translation vector of 3X 1, [ X ]w Yw Zw 1]TAre the coordinates of points in a world coordinate system. ZcObtained from camera calibration external reference, [ u v 1 ]]TTo match the pixel coordinates of the feature points, fx、fy、u0、v0Obtaining from camera calibration internal reference external reference, R, T from camera calibration external reference;
in order to obtain the condition of linear displacement, orthogonal decomposition is carried out on the displacement of the characteristic points;
displacement example calculation is carried out through a distance formula, and the calculation formula is as follows:
wherein d is the distance between two points, (X)1，Y1，Z1) As three-dimensional world coordinates of feature points in the reference image, (X)2，Y2，Z2) Comparing three-dimensional world coordinates of the feature points in the image; obtaining a calculation result d of the matched feature points through a calculation formula, wherein the calculation result d is equal to an alarm threshold value d1Comparing, when d is>d1I.e. displaced when d ≦ d1No displacement occurs.
And sixthly, turning off the LED light source and turning off the power supply of the camera.
It should be noted that the terms "first", "second", "third", etc. are used to define the components and the optical paths, and are only used for convenience of distinguishing the corresponding components and the optical paths, and if not stated otherwise, the terms do not have special meanings, and thus, the scope of the present invention should not be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent transformation, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A space displacement and strain measuring device based on a CCD camera is characterized by comprising a CCD color camera, a first spectroscope, a second spectroscope, a first reflector, a second reflector and a third reflector;
the first reflector, the first spectroscope and the second spectroscope form a first optical path, the second reflector and the first spectroscope form a second optical path, and the third reflector, the second spectroscope and the first spectroscope form a third optical path; the first light path, the second light path and the third light path all enter the CCD color camera;
the CCD color camera is used for shooting through the first light path, the second light path and the third light path so as to obtain a target image.
2. The device for measuring the spatial displacement and the strain based on the CCD camera according to claim 1, further comprising a first filter, a second filter and a third filter;
the first filter is arranged in the first light path and is used for filtering the first light path so as to obtain first color light;
the second filter is arranged in the second light path and is used for filtering the second light path so as to obtain second color light;
and the third filter plate is arranged in the third light path and is used for filtering the third light path so as to obtain third color light.
3. The device for measuring the spatial displacement and the strain based on the CCD camera according to claim 2, which is characterized by further comprising a first light source, a second light source and a third light source;
the first light source has the same light emitting color as the first color light, the second light source has the same light emitting color as the second color light, the third light source has the same light emitting color as the third color light, and the first light source, the second light source and the third light source are all used for supplementing light for shooting of the CCD color camera.
4. The device of claim 1, wherein the first beam splitter has a first input end, a second input end and a first output end, and the second beam splitter has a third input end, a fourth input end and a second output end;
the first input end is used for receiving the light reflected by the second reflector, so that the first spectroscope is subjected to light splitting according to a preset first light splitting ratio and then outputs the light to the CCD color camera through the first output end;
the third input end is used for receiving the light reflected by the first reflector, so that the second spectroscope is split according to a preset second splitting ratio and then outputs the light to the second input end through the second output end, and the first spectroscope is split according to a preset first splitting ratio and then outputs the light to the CCD color camera through the first output end;
the fourth input end is used for receiving the light reflected by the third reflector, so that the second spectroscope is split according to a preset second splitting ratio and then outputs the split light to the second input end through the second output end, and the first spectroscope is split according to a preset first splitting ratio and then outputs the split light to the CCD color camera through the first output end.
5. The device for measuring spatial displacement and strain based on the CCD camera as claimed in any one of claims 1-4, wherein the CCD color camera is connected with a computer with image processing function through a data line, the computer is used for extracting the features of the target image and recording the coordinate positions of pixel points in the target image, thereby calculating the displacement variable.
6. A method of spatial displacement and strain measurement, wherein the method uses the apparatus of any one of claims 1-5 to perform the steps of:
positioning characteristic points on the surface of a measured object;
and continuously shooting the characteristic points along the first light path, the second light path and the third light path for multiple times so as to obtain multiple target images.
7. The method of claim 6, further comprising the steps of:
filtering the light of the first light path by using the first filter to obtain first color light; and filtering the light of the second light path by using the second filter to obtain second colored light, and filtering the light of the third light path by using the third filter to obtain third colored light.
8. The method of claim 6, further comprising the steps of:
and supplementing light for shooting of the camera by using the first light source, the second light source and the third light source according to the color of the object to be measured and the color of the surrounding environment background.
9. The method of claim 6, further comprising the steps of:
changing the reflection direction of the first reflector so as to change the path of the first light path;
changing the reflection direction of the second mirror, thereby changing the path of the second optical path;
the reflecting direction of the third reflecting mirror is changed, so that the path of the third light path is changed.
10. A method of spatial displacement and strain measurement according to any of claims 6 to 9, further comprising the steps of:
selecting one image from each target image as a reference image, and selecting the rest target images as comparison images;
extracting the features of the reference image, loading the features into a database, comparing the features of the comparison image, loading the two-dimensional position information of the image where each pixel of the reference image is located into the database to form original position information, and setting a displacement alarm threshold;
and sequentially comparing the characteristics of the comparison image with the characteristics in the database, and extracting two-dimensional position data of the image where each pixel is located in the comparison image to form real-time position information.
And calculating the two-dimensional position distance of each real-time position information and the image where the original position information is located, and determining that the characteristic point generates displacement when the difference value of the two-dimensional position distances is greater than a displacement alarm threshold value.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202074952U (en) * | 2011-05-04 | 2011-12-14 | 李中伟 | Three dimensional profiles and colored textures acquisition system based on single camera-single overhead projector |
| CN105651198A (en) * | 2016-01-14 | 2016-06-08 | 清华大学 | Stress monitoring method and stress monitoring device |
| CN106441135A (en) * | 2016-08-29 | 2017-02-22 | 清华大学 | Device and method for synchronously measuring three-dimensional deformation and temperature with single camera under high temperature environment |
| CN108225217A (en) * | 2017-12-28 | 2018-06-29 | 中国科学院西安光学精密机械研究所 | Color body measuring three-dimensional profile method |
| WO2018144437A1 (en) * | 2017-01-31 | 2018-08-09 | Oakland University | 3d digital image correlation using single, color camera pseudo-stereo system |
-
2019
- 2019-08-29 CN CN201910809508.9A patent/CN110595364B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202074952U (en) * | 2011-05-04 | 2011-12-14 | 李中伟 | Three dimensional profiles and colored textures acquisition system based on single camera-single overhead projector |
| CN105651198A (en) * | 2016-01-14 | 2016-06-08 | 清华大学 | Stress monitoring method and stress monitoring device |
| CN106441135A (en) * | 2016-08-29 | 2017-02-22 | 清华大学 | Device and method for synchronously measuring three-dimensional deformation and temperature with single camera under high temperature environment |
| WO2018144437A1 (en) * | 2017-01-31 | 2018-08-09 | Oakland University | 3d digital image correlation using single, color camera pseudo-stereo system |
| CN108225217A (en) * | 2017-12-28 | 2018-06-29 | 中国科学院西安光学精密机械研究所 | Color body measuring three-dimensional profile method |
Non-Patent Citations (1)
| Title |
|---|
| 俞立平等: "使用单彩色相机的单相机三维数字图像相关方法", 《实验力学》 * |
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