CN111578841A - Large-visual-field image measuring system - Google Patents
Large-visual-field image measuring system Download PDFInfo
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- CN111578841A CN111578841A CN202010473123.2A CN202010473123A CN111578841A CN 111578841 A CN111578841 A CN 111578841A CN 202010473123 A CN202010473123 A CN 202010473123A CN 111578841 A CN111578841 A CN 111578841A
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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
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Abstract
The application provides a large-visual-field image measuring system, which comprises a lens, a measuring unit and a control unit, wherein the lens is used for acquiring an image plane with a first size; the image splitting device is used for equally splitting the image surface of the first size acquired by the lens into at least two image surfaces of a second size corresponding to the number of output ends of the image splitting device, and the second size is smaller than the first size; at least two transmission devices for transmitting the image planes of the second size, wherein each transmission device transmits one image plane of the second size; at least two receiving devices for receiving the image plane of the second size; the imaging chips are used for converting the image plane with the second size into picture information; and the image processing device is used for acquiring at least two pieces of picture information from the imaging chip and splicing the two pieces of picture information into one picture. According to the embodiment of the invention, the large-size clear-imaged part image surface can be obtained, the geometric size measurement accuracy of the part is ensured, and the cost for measuring the part by depending on a large target surface camera is reduced.
Description
Technical Field
The invention relates to the field of image measurement, in particular to a large-visual-field image measurement system.
Background
In the production and manufacturing process, the measurement of the geometric dimension of the part is an indispensable important link. The image measuring instrument is a widely used geometric dimension measuring device, a measured piece is placed on a workbench, an image system is used for focusing and photographing the characteristics of the measured dimension, and the measurement of the geometric dimension is completed through image processing.
For image measurement, the measurement efficiency is directly related to the field of view of the optical system, so the field of view of the lens is increasingly larger. On the other hand, in order to ensure the measurement accuracy, the image surface size is synchronously enlarged under the condition that the lens magnification is not changed, and a large target surface camera is required to be equipped. However, the large target surface camera has a large image and a low transmission rate, which results in a low frame rate and limits further improvement of the measurement efficiency.
Disclosure of Invention
In view of this, the invention provides a large-view image measuring system, which is applied to a component measuring process, and can divide a large-size image plane into small-size image planes for transmission, so as to improve the transmission rate of the image plane, and then reduce the image plane image of a large-view lens, thereby ensuring that the large-size image plane image is clear, improving the measuring precision and efficiency, and reducing the measuring cost of measuring the component by using a large-target-plane camera.
In order to solve the technical problems, the invention adopts the following technical scheme:
according to an embodiment of the first aspect of the present invention, a large-field image measuring system includes:
the lens comprises an input end and an output end and is used for acquiring an image plane of a first size;
the image splitting device comprises an input end and at least two output ends, the input end of the image splitting device is coupled with the output ends of the lens, the end face of the input end of the image splitting device is positioned on the focal plane of the lens, the image splitting device is used for equally dividing the image planes of a first size acquired by the lens into at least two image planes of a second size corresponding to the number of the output ends of the image splitting device, and the second size is smaller than the first size;
the input end of each transmission device is coupled with the output end of one image splitting device and used for transmitting the image plane of the second size, wherein each transmission device transmits the image plane of the second size;
the input end of each receiving device is coupled with the output end of one transmission device and used for receiving the image plane with the second size;
the receiving end of each imaging chip and the output end of the receiving device are arranged at intervals, the interval is the focal length of the receiving device, and the imaging chips are used for converting the image plane with the second size into picture information;
and the image processing device is connected with the at least two imaging chips and is used for acquiring at least two pieces of picture information from the imaging chips and splicing the two pieces of picture information into one picture.
As an embodiment of the first aspect of the invention, the lens is a telecentric lens.
As an embodiment of the first aspect of the present invention, the light rays at the output end of the lens are collimated and emitted in parallel.
As an embodiment of the first aspect of the present invention, the image splitting device is composed of a plurality of groups of optical fiber bundles, each group of optical fiber bundles has a same front working surface and an independent rear working surface, the front working surface is an input end of the image splitting device, and the rear working surface is an output end of the image splitting device.
As an embodiment of the first aspect of the present invention, the optical fibers of the image splitting device are regularly arranged, and each optical fiber corresponds to a pixel of the lens.
As an embodiment of the first aspect of the present invention, the number of the optical fibers at each of the output ends of the image splitting device is equal to the number of the pixels of each of the imaging chips.
As an embodiment of the first aspect of the present invention, the diameter of the input end of the image dividing means is larger than the diameter of the output end.
As an embodiment of the first aspect of the present invention, the transmission device is composed of optical fibers, and the optical fibers of the transmission device and the optical fibers of the image splitting device correspond to each other one by one and are coupled and connected in parallel.
As an embodiment of the first aspect of the present invention, the receiving means is a lens structure.
As an embodiment of the first aspect of the present invention, the lens structure magnifies and collimates the image transmitted by the transmission device and outputs the magnified and collimated image.
As an embodiment of the first aspect of the present invention, the image processing apparatus is a computer or an image acquisition card.
As an embodiment of the first aspect of the present invention, the image processing apparatus performs image preprocessing on picture information transmitted by the imaging chip, the image preprocessing including:
and carrying out image edge matching by using the pixel characteristic points, and splicing the pictures to form a picture.
As an embodiment of the first aspect of the present invention, the method further includes:
a light source for providing light to the lens.
As an embodiment of the first aspect of the present invention, the imaging chip is a CMOS chip or a CCD chip.
As an embodiment of the first aspect of the present invention, the audio data to be tested and the sample audio data are stored at the PC, which facilitates the comparison between the two sets of data.
The technical scheme of the invention at least has one of the following beneficial effects:
according to the large-view image measuring system provided by the embodiment of the invention, a large-size image surface can be divided into small-size image surfaces to be transmitted, the transmission rate of the image surfaces is increased, and then the image surfaces are restored into image images of the large-view lens, so that the large-size image surfaces are clear, the measuring precision and efficiency are improved, and the measuring cost of measuring parts by using a large-target-surface camera is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a large-field-of-view image measurement system according to an embodiment of the present invention;
fig. 2 is a detailed enlarged view of the large-field-of-view image measuring system according to the embodiment of the invention.
Reference numerals:
100. a lens; 200. an image splitting device; 210 output terminals;
300. a transmission device; 400. a receiving device; 500. an imaging chip.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the wide-field image measuring system according to the embodiment of the present invention includes a lens 100, an image splitting device 200, a transmitting device 300, a receiving device 400, an imaging chip 500 and an image processing device.
Specifically, the lens 100 includes an input end and an output end, for acquiring an image plane of a first size, the image splitting device 200 includes an input end and at least two output ends, the input end of the image splitting device 200 is coupled with the output end of the lens 100, and an end face of the input end of the image splitting device 200 is located on a focal plane of the lens 100, the image splitting device 200 is used for equally dividing the image plane of the first size acquired by the lens 100 into at least two image planes of a second size corresponding to the number of the output ends 210 of the image splitting device 200, the second size is smaller than the first size, at least two transmission devices, an input end of each transmission device is coupled with the output end 210 of one image splitting device 200 for transmitting the image plane of the second size, wherein each transmission device transmits one image plane of the second size, at least two receiving devices 400, an input end of each receiving device 400 is coupled with an output end of one transmission device, the image processing device is connected with the at least two imaging chips 500 and used for acquiring at least two pieces of picture information from the imaging chips 500 and splicing the two pieces of picture information into one picture.
That is to say, the lens 100 is an imaging element, in the embodiment of the present invention, the telecentric lens 100 is selected as an imaging element, which may be a single-side telecentric lens or a double-side telecentric lens, and the telecentric lens 100 may be within a certain object distance range, so that the obtained image magnification does not change with the change of the object distance, and the situation that the image shows a big-end-to-small-end state when shooting a component does not occur, therefore, the telecentric lens 100 is suitable for the application of size measurement, especially for high-precision measurement, measurement and measurement of the size of the component, and the like, the telecentric lens 100 is aligned with the component to be measured, the light reflected by the component to be measured enters from the input end of the telecentric lens 100 and then is output from the output end of the telecentric lens 100, wherein the light path output by the telecentric lens 100 at the output end is collimated output, and the light containing imaging information is parallel emitted light, light containing imaging information is transmitted from the output end of the lens 100 to the input end of the image splitter 200.
Wherein, the image splitter 200 can be an array type light cone, an optical fiber panel or an optical fiber image inverter, the image splitter 200 is composed of tens of thousands of tiny optical fibers, wherein, the optical fibers have the advantages of low transmission loss and high speed, each optical fiber corresponds to a pixel containing imaging information transmitted from the output end of the telecentric lens 100 and is used for transmitting light information without mutual interference, the regularly arranged optical fibers correspondingly transmit the carried pixel information to the output end 210 of the image splitter 200 one by one, thus, the pixel information can be rapidly and accurately transmitted through the optical fibers, the transmission rate is improved, the pixel information is amplified or reduced by M times along with the change of the diameter of the optical fiber in the transmission process, M is a non-zero natural number, in the application of the embodiment of the invention, the diameter of the optical fiber at the output end of the image splitter 200 is smaller than the diameter of the optical fiber at the input end, that is, in the transmission process of the image splitter 200, for example, the diameter of the optical fiber at the input end of the image splitter 200 is 10mm, the diameter of the optical fiber at the output end is 5mm, the image element is doubled during the transmission of the image splitter 200 from the input end to the output end, that is, the image plane size at the output end of the image splitter 200 is half of the image plane size at the input end, so that the image splitter 200 reduces the image element to speed up the transmission of the image element, the arrangement of the optical fibers at the output end of the image splitter 200 is the same as the arrangement of the input end, so that the image elements are combined and imaged at the output end 210 of the image splitter 200 according to the original arrangement, the image splitter 200 may have at least 2 output ends, as shown in fig. 1, the image splitter 200 in the embodiment of the present invention includes 4 output ends, so that the optical fiber at the input end of the image splitter is equally divided into four parts and respectively corresponds to the 4 output ends 210 of the image splitter, thus, the image elements captured by telecentric lens 100 are transmitted in the form of an image of an area equally divided by 1/4 at output end 210 of image splitter 200. in a specific application of the embodiment of the present invention, the number of output ends of image splitter 200 is determined by the size of the target surface at the input end of telecentric lens 100. if the size of the target surface at the input end of telecentric lens 100 is larger, the number of output ends 210 of image splitter 200 is required to be larger.
The input end of the receiving device 400 is connected to the output end 210 of the image splitting device 200, that is, the image splitting device 200 has several output ends, and correspondingly there are several receiving devices 400, as shown in fig. 1, the image splitting device 200 in the embodiment of the present invention has 4 output ends, and correspondingly there are 4 receiving devices 400, the receiving devices 400 are a group of lens structures, the lens structures can play a role of magnifying and collimating, the image splitting device 200 reduces the transmitted image element information by the optical fiber, the receiving devices 400 magnifies and collimates the image element by the magnification of the lens, and outputs the magnified image element information.
The input end of the imaging chip 500 is spaced from the output end of the receiving device 400, that is, the measuring system has several receiving devices 400, and there are several imaging chips 500, as shown in fig. 2, there are 4 receiving devices 400 in the embodiment of the present invention, and there are 4 corresponding imaging chips 500, and the distance between the imaging chip 500 and the receiving device 400 is equal to the focal length of the lens structure of the receiving device 400, that is, the imaging chip 500 is located at the focal length of the lens structure, so that the pixel information after the lens structure is collimated and amplified can be projected onto the input end of the imaging chip 500, wherein the number of pixels of the imaging chip 500 is equal to the number of optical fibers at the output end of the image splitter 200, so that the pixel information is transmitted to the imaging chip 500 in a one-to-one correspondence.
The image processing device is connected to the imaging chips 500, as shown in fig. 2, the image plane obtained by the telecentric lens 100 is equally divided into quarter size by the image dividing device 200, and finally obtained by the imaging chips 500 through the transmission device and the receiving device 400, each imaging chip 500 obtains quarter size pixel information, the imaging chips 500 transmit the obtained pixel information to the image processing device for image and processing, the image processing device performs image edge matching by using pixel feature points, and four pictures are spliced into one picture.
Therefore, the large-view image measuring system can divide a large-size image surface into small-size image surfaces for transmission, improve the transmission rate of the image surface, and restore the whole image of a large-size part, so that the part image surface with clear large-size imaging is obtained, the geometric size measuring accuracy of the part is ensured, and the measuring cost of measuring the part by using a large target surface camera in the prior art is reduced.
According to an embodiment of the present invention, the image splitter 200 is composed of a plurality of groups of optical fiber bundles, each group of optical fiber bundles has the same front working surface and a separate rear working surface, the front working surface is the input end of the image splitter 200, and the rear working surface is the output end 210 of the image splitter 200. The arrangement sequence of the front working faces of the optical fiber bundles is consistent with that of the rear working faces, so that the pixels can be ensured to be in one-to-one correspondence in the transmission process.
According to an embodiment of the present invention, the optical fibers of the image splitter 200 are arranged regularly, and each optical fiber corresponds to a pixel of the lens 100.
According to an embodiment of the present invention, the transmission device is composed of optical fibers, and the optical fibers of the transmission device and the optical fibers of the image splitter 200 correspond to each other one by one and are coupled in parallel.
According to an embodiment of the present invention, the number of optical fibers at each output end of the image splitter 200 is equal to the number of pixels of each imaging chip 500.
According to one embodiment of the present invention, the receiving device 400 is a lens structure.
According to one embodiment of the invention, the lens structure amplifies and collimates the image transmitted by the transmission device and outputs the image.
According to an embodiment of the present invention, the image processing device is a computer or an image acquisition card, wherein both the computer and the image acquisition card have a calculation function, and can perform processing such as merging, feature extraction, and size calculation on the obtained images, so as to obtain a complete component measurement diagram.
According to one embodiment of the present invention, the image processing apparatus performs image preprocessing on the picture information transmitted by the imaging chip 500, the image preprocessing including:
and carrying out image edge matching by using the pixel characteristic points, and splicing the pictures to form a picture.
According to one embodiment of the invention, the system further comprises:
the light source is used for providing light rays for the lens 100, when measuring parts, the light source is required to irradiate the parts, and the reflected light of the parts enters the lens 100 to realize the imaging function of the measuring system.
According to an embodiment of the present invention, the imaging chip 500 is a CMOS chip or a CCD chip, wherein the CMOS chip is convenient for mass production, and has a high speed and a low cost, and the CCD chip has a good imaging image quality, and in practical applications, a suitable chip can be selected according to actual requirements.
Therefore, the large-view image measuring system provided by the embodiment of the invention can divide a large-size image plane into small-size image planes for transmission, improve the transmission rate of the image plane, and restore the small-size image planes into image planes of the large-view lens, so that the large-size image plane is clear, the measuring precision and efficiency are improved, and the measuring cost of measuring parts by using a large-target-plane camera is reduced.
Other structures and operations of the large-field image measuring system according to the embodiment of the present invention will be understood and easily implemented by those skilled in the art, and thus will not be described in detail.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A large field of view image measurement system, the system comprising:
a lens (100) comprising an input end and an output end, and used for acquiring an image surface with a first size;
the image splitting device (200) comprises an input end and at least two output ends (210), the input end of the image splitting device (200) is coupled with the output end of the lens (100), the end face of the input end of the image splitting device (200) is positioned on the focal plane of the lens (100), the image splitting device (200) is used for equally dividing the image plane of a first size acquired by the lens (100) into at least two image planes of a second size corresponding to the number of the output ends of the image splitting device (200), and the second size is smaller than the first size;
at least two transmission devices (300), wherein the input end of each transmission device (300) is coupled with the output end of one image splitting device (200) and is used for transmitting the image plane of the second size, and each transmission device (300) transmits the image plane of the second size;
at least two receiving devices (400), wherein the input end of each receiving device (400) is coupled with the output end of one transmitting device (300) and is used for receiving the image surface with the second size;
the receiving end of each imaging chip (500) and the output end of the receiving device (400) are arranged at intervals, the interval is the focal length of the receiving device (400), and the imaging chips (500) are used for converting the image plane with the second size into picture information;
the image processing device is connected with the at least two imaging chips (500) and is used for acquiring at least two pieces of picture information from the imaging chips (500) and splicing the two pieces of picture information into one picture.
2. The system according to claim 1, wherein the light rays at the output end of the lens (100) are collimated and emitted in parallel.
3. The system according to claim 1, wherein the image splitting device (200) is comprised of a plurality of groups of fiber bundles, each group of fiber bundles having a same front face, which is an input end of the image splitting device (200), and a separate rear face, which is an output end of the image splitting device (200).
4. The system according to claim 3, wherein the optical fibers of the image splitter (200) are arranged regularly, each corresponding to a pixel of the lens (100).
5. The system of claim 3, wherein the number of optical fibers at each of said output ends of said image splitter (200) corresponds to the number of pixels of each of said imaging chips (500).
6. The system according to claim 1, wherein the transmission device (300) is composed of optical fibers, and the optical fibers of the transmission device (300) and the optical fibers of the image splitter (200) are in one-to-one correspondence and are coupled in parallel.
7. The system according to claim 6, wherein the receiving device (400) amplifies and collimates the image transmitted by the transmitting device (300) and outputs the amplified and collimated image.
8. The system of claim 1, wherein the image processing device is a computer or an image acquisition card.
9. The system according to claim 1 or 8, characterized in that the image processing means performs image pre-processing on the picture information transmitted by the imaging chip (500), the image pre-processing comprising:
and carrying out image edge matching by using the pixel characteristic points, and splicing the pictures to form a picture.
10. The system of claim 1, further comprising:
a light source for providing light to the lens (100).
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