Portable multi-view-field measuring device

Abstract

The invention discloses a portable multi-view-field measuring device which comprises a shell, a color combination prism, two optical reflectors and two optical adjusting frames, wherein the color combination prism, the two optical reflectors and the two optical adjusting frames are fixed in the shell; a cover is arranged on the outer side of the shell, a structure for fixing a color combination prism is arranged in the middle of the inner side of the shell, and structures for installing optical adjusting frames are arranged on the two sides of the inner side of the shell. The left and right sides of the front surface of the housing are respectively provided with an optical path window. The housing is fixed on the lens of the camera. The optical reflector reflects the light source penetrating through the target measurement area of the light path window to the color combination prism; the optical adjusting frame is used for installing and adjusting the optical reflecting mirror; and the color combination prism is used for filtering the reflected light of the optical reflector, so that the light with the specified wavelength enters a lens of the camera and is imaged on an image sensor of the camera. According to the device, on the basis of not losing the measurement resolution and not increasing image elements of the image sensor, the measurement resolution of a small moving object in a large moving range is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of optical measuring instruments, and in particular relates to a portable complex field of view measuring device. Background Art

[0002] Field of View (FOV), also known as visual field, refers to the visible range of objects that can be observed by the optical system. It is usually expressed in angles. The larger the field of view, the larger the visible range of objects. Resolution, specifically optical resolution, is used to describe the ability of an optical imaging system to resolve object details. When the image sensor is a CCD or CMOS, if the maximum number of pixels of the image sensor is M×N pixels, and it is used to capture a field of view of P×Q mm2, the resolution is usually measured by its ability to distinguish details in a certain direction, P / M mm / pixel, Q / N mm / pixel. The larger the P / M and Q / N values, the lower the resolution of the optical system. In traditional optical measurement methods, the larger the field of view, the lower the corresponding resolution, and the measurement field of view and resolution restrict each other.

[0003] Traditional three-dimensional high-speed measurement technology is developed based on binocular stereo vision and high-speed photogrammetry, and is currently a better technology for measuring large moving objects. However, when a smaller measurement target moves within a relatively large range, measuring the detail changes of the object itself is still a relatively large challenge. To solve this problem, while increasing the measurement field of view, it is necessary to improve the optical resolution. The current existing methods require adding more high-speed cameras to form a camera array, image sensor array or lens array, or using a single camera phase separation method to simultaneously image multiple measurement fields of view onto the same image sensor of the same camera. However, the camera array independently images each sub-field of view target in the measurement range onto its own image sensor or part of the image sensor, and the sensors (parts) are parallel to each other without superposition. It is a type of device that improves resolution by increasing the number of image sensor pixels, and generally has a large volume and high cost; while the single camera phase separation is to divide the image sensor into many small units, each of which corresponds to a measurement sub-field of view, thereby expanding the measurement field of view, and the resolution is generally low. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a portable complex field of view measurement device to solve the problems that the existing measurement devices based on optical methods are large in size, difficult to carry, expensive, and may have low resolution.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A portable complex field of view measuring device of the present invention is installed on the lens of a camera, and comprises: a housing, a color combining prism fixed in the housing, two symmetrically distributed optical reflectors, and two optical adjustment frames;

[0007] The outer side of the shell is provided with a cover, the middle part of the inner side of the shell is provided with a structure for fixing the color combining prism, and the inner sides of the shell are provided with structures for installing two optical adjustment frames; an optical path window is provided on each of the left and right sides of the front side of the shell, and the two optical path windows are symmetrically distributed; the shell is fixed on the lens of the camera through an external thread structure;

[0008] The optical reflector reflects the light source of the target measurement area passing through the optical path window onto the color combining prism;

[0009] The optical adjustment frame is used to install and adjust the optical reflector;

[0010] The color combining prism filters the reflected light of the optical reflector, allowing light of a specified wavelength to enter the lens of the camera and form an image on the image sensor of the camera, and each image occupies all the pixels of a single image sensor.

[0011] Furthermore, the complex field of view used by the measuring device corresponds to the target measurement area, that is, the object to be measured and its motion range; the target measurement area is divided into two continuous sub-areas, and the two optical reflectors correspond to the two sub-areas in the target measurement area respectively; the size of the large moving object to be measured is less than or equal to the size of any sub-area; the edges of the two continuous sub-areas partially overlap, and the overlapping portion does not exceed 5% of the sub-areas.

[0012] Furthermore, it is set that the sub-field of view or the sub-area of ​​the target measurement area is imaged as a sub-image in the image sensor, and the number of sub-images is 2; two consecutive sub-areas can be pseudo-superimposedly imaged on the same image sensor of the same camera, and each sub-area occupies all pixels of a single image sensor, that is, M×N pixels; the pseudo-superimposed imaging is to separate the pseudo-superimposed image on the image sensor into two completely independent images by adopting a stroboscopic automatic lighting method, and the size of each image is M×N pixels;

[0013] Without considering the overlap between the fields of view, the actually reconstructed pixels of the target measurement area are equal to M×N×2 pixels; considering the overlap between the fields of view, the actually reconstructed pixels of the target measurement area are greater than M×N×2×95% pixels.

[0014] Furthermore, by adjusting the angles θ1 and θ2 between the two optical reflectors and the color combining prism respectively, the two sub-areas of the target measurement area can be simultaneously and completely imaged onto the same image sensor (M×N pixels) of the same camera.

[0015] Furthermore, the external thread for assembling the housing and the camera can be adjusted according to the selected camera model.

[0016] Furthermore, the middle part of the shell is provided with two symmetrically distributed bosses for fixing the color combining prism, and the size of a single boss is 10×3×10 mm.

[0017] Furthermore, two symmetrically distributed mounting holes are provided on both sides of the inner side of the housing for mounting two optical adjustment frames.

[0018] The measuring device of the present invention measures an object (size Q) within a certain motion range (target area size P). If the resolution of the image sensor of the assembled camera is M×N pixels, the reconstructed camera image resolution is approximately equal to M×N×Q / P×2 pixels; if a traditional M×N resolution camera is used to directly image the motion range P, the resolution of the object on the image sensor is approximately only M×N×Q / P, which is lower than the resolution in the present invention.

[0019] Beneficial effects of the present invention:

[0020] The measuring device of the present invention adjusts the wavelength range of light from the measured object entering the lens of the camera, and pseudo-overlaps two continuous sub-areas of the target measurement area onto the image sensor of the camera; by adopting the stroboscopic illumination method of the non-wavelength light source, the image of the moving object is separated, and the movement of the sub-field of view or even the entire measurement field of view object is reconstructed, thereby improving the measurement resolution of smaller moving objects within a large motion range without losing the measurement resolution and without increasing the number of image sensor pixels. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the measuring device of the present invention.

[0022] Figure 2 Schematic diagram of the imaging method in Example 1 of the present invention.

[0023] Figure 3 It is a schematic diagram of the combination of the device in Example 2 of the present invention and compound eye imaging.

[0024] Figure 4 Schematic diagram of the relationship between field of view and resolution in the present invention.

[0025] Figure 5 It is a physical assembly diagram of the measuring device of the present invention.

[0026] Figure 6 It is a schematic diagram of the structure of the cover in the present invention. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0028] As attached Figure 1 , Figure 5 , Figure 6 As shown, a portable complex field of view measuring device is installed on the lens of a camera, comprising: a housing 10 and a color combining prism 20 fixed in the housing, two symmetrically distributed optical reflectors 101 and 102, and two optical adjustment frames 105 and 106; the color combining prism 20 is fixed in the middle of the housing 10, and its front is blocked by the housing 10; two symmetrically distributed optical reflectors 101 and 102, with an angle of 15° to 165° between the two, are respectively fixed on two optical adjustment frames 105 and 106, and the two sub-areas of the target measurement area can be simultaneously and completely imaged onto the same image sensor of the same camera by adjusting the angles θ1 and θ2 between the two optical reflectors and the color combining prism 20 respectively; a cover 100 is provided on the outer side of the housing; the housing and the lens of the camera are connected and matched by threads;

[0029] A structure for fixing the color combining prism is provided in the middle of the inner side of the shell, and structures for installing two optical adjustment frames are provided on both sides of the inner side of the shell; an optical path window 1001 and 1002 are respectively provided on the left and right sides of the front side of the shell, and the two optical path windows are symmetrically distributed;

[0030] The middle part of the shell is provided with a structure for fixing the color combining prism, which is two symmetrically distributed bosses (not shown in the figure), and the size of a single boss is 10×3×10 mm.

[0031] There are two symmetrically distributed mounting holes (not shown in the figure) on both sides of the inner side of the housing for mounting two optical adjustment frames, which are mounted by M4 or M6 screws.

[0032] The optical reflector reflects the light source in the target measurement area onto the color combining prism;

[0033] The optical adjustment frame is used to install and adjust the optical reflector, and its position and angle can be fine-tuned without moving the plane mirror, so as to achieve the purpose of adjusting the size of the measurement field of view;

[0034] The color combining prism 20 filters the reflected light of the optical reflector, allowing light of a specified wavelength to enter the lens of the camera and form an image on the image sensor of the camera, and each image occupies all the pixels of a single image sensor.

[0035] Embodiment 1:

[0036] As attached Figure 2As shown, the fields of view (sub-field of view 1 and sub-field of view 2) of the cameras (401 and 402) correspond to the target measurement area, that is, the motion range of the object to be measured; sub-field of view 1 and sub-field of view 2 are two continuous fields of view, and the edges of the fields of view partially overlap, and the overlapping portion does not exceed 5% of the sub-fields of view; sub-field of view 1 covers light sources with a wavelength range of 622 to 760 nm, and sub-field of view 2 covers light sources with a wavelength range of 435 to 450 nm.

[0037] The light emitted from the surface of the object moving in the sub-field of view 1 enters two optical reflectors 101 and 103;

[0038] (1) It is reflected by the optical reflector 101 to the color combining prism 201, then enters the lens 301, and forms an image on the image sensor 401, and the image occupies all the pixels of the image sensor 401;

[0039] (2) The light is reflected by the optical reflector 103 onto the color combining prism 202 , then enters the lens 302 , and forms an image on the image sensor 402 , and the image occupies all the pixels of the image sensor 402 .

[0040] The light emitted from the surface of the object moving in the sub-field of view 2 enters the two optical reflectors 102 and 104;

[0041] (1) The light is reflected by the optical reflector 102 onto the color combining prism 201, then enters the lens 301, and forms an image on the image sensor 401, and the image occupies all pixels of the image sensor 401;

[0042] (2) The light is reflected by the optical reflector 104 onto the color combining prism 202 , then enters the lens 302 , and forms an image on the image sensor 402 , and the image occupies all pixels of the image sensor 402 .

[0043] The pseudo-overlapping imaging of sub-field of view 1 and sub-field of view 2 on image sensors 401 and 402, respectively, can be separated by using stroboscopic illumination of a wavelength-independent light source. In this embodiment, when the object to be measured moves in sub-field of view 1, the wavelength range of the light emitted by the flash lamp is set to 622-760 nm, and the image of the object to be measured moving in sub-field of view 1 is collected by the camera; when the object to be measured moves into sub-field of view 2, the wavelength range of the light emitted by the flash lamp is set to 435-450 nm, and the image of the object to be measured moving in sub-field of view 2 is collected by the camera.

[0044] Embodiment 2:

[0045] As attached Figure 3As shown, the difference between this embodiment and embodiment 1 is that: in this embodiment, S (S≥2) portable complex field of view measurement devices are combined with the lens array 30, and the S sub-fields of view can be imaged onto the image sensors 401 and 402 at the same time. At this time, the actual reconstructed pixels of the target measurement area are approximately equal to M×N×S pixels; the measurement principle of this embodiment is that by covering the S sub-fields of view with visible light of different wavelength ranges, when the measured object moves in different sub-fields of view, due to the different wavelength ranges of the light emitted from its surface, when it is reflected to the color combining prism through the optical reflector, it will still be separated and imaged onto the same image sensor of the same camera at the same time under the action of the color combining prism, and this pseudo-overlapping imaging can be separated by adopting stroboscopic illumination of a non-wavelength light source.

[0046] Separation and resolution of pseudo-overlapping images:

[0047] As attached Figure 4 As shown, the measured object 501 moves in the target measurement area 50:

[0048] (1) The two sub-fields of view of the lens 301 have two sub-images in the image sensor 401, and the resolution of each sub-image is the full resolution of the image sensor 401, that is, M×N pixels;

[0049] (2) The two sub-fields of view of the lens 302 have two sub-images in the image sensor 402, and the resolution of each sub-image is the full resolution of the image sensor 402, that is, M×N pixels.

[0050] In this example, the actual target measurement area 50 of each camera is twice that of a single sub-field of view. When the sub-field of view is in a dark field, the image grayscale value is approximately 0, and the resolution of each dark field sub-image is M×N. When the sub-image is a target speckle, the image grayscale value is the speckle grayscale value f, and the resolution of the speckle sub-image is M×N.

[0051] The image of each image sensor (401 or 402) is ultimately the combined effect of the grayscale superposition of the two sub-images, that is, the grayscale value of the final image is derived from the grayscale superposition of images with a resolution of M×N×2, f+0=f; therefore, the actual resolution of the target measurement area is approximately equivalent to M×N×2 pixels.

[0052] The present invention has many specific application paths. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principle of the present invention. These improvements should also be regarded as the protection scope of the present invention.

Claims

1. A portable complex field of view measuring device, which is mounted on the lens of a camera, characterized in that: include: A housing, a color combining prism fixed in the housing, two symmetrically distributed optical reflectors, and two optical adjustment frames; A structure for fixing a color combining prism is provided in the middle of the inner side of the shell, and structures for installing two optical adjustment frames are provided on both sides of the inner side of the shell; an optical path window is provided on each of the left and right sides of the front side of the shell, and the two optical path windows are symmetrically distributed; the shell is fixed on the lens of the camera through an external thread structure; The optical reflector reflects the light source of the target measurement area through the optical path window onto the color combining prism; Optical adjustment frame, used to install and adjust optical reflectors; The color combining prism filters the reflected light from the optical reflector, allowing light of a specified wavelength to enter the camera lens and form an image on the camera's image sensor, with each image occupying all the pixels of a single image sensor.

2. The portable complex field of view measuring device according to claim 1, characterized in that: The complex field of view used by the measuring device corresponds to the target measurement area, which is the object to be measured and its motion range; the target measurement area is divided into two continuous sub-areas, and the two optical reflectors correspond to the two sub-areas in the target measurement area respectively; the size of the large moving object to be measured is less than or equal to the size of any sub-area; the edges of the two continuous sub-areas partially overlap, and the overlapping portion does not exceed 5% of the sub-areas.

3. The portable complex field of view measuring device according to claim 1, characterized in that: The sub-field of view or the sub-area of ​​the target measurement area is set to be imaged as two sub-images in the image sensor; two consecutive sub-areas can be pseudo-superimposedly imaged on the same image sensor of the same camera, and each sub-area occupies all pixels of a single image sensor, that is, M×N pixels; the pseudo-superimposed imaging is to separate the pseudo-superimposed image on the image sensor into two completely independent images by adopting a stroboscopic automatic lighting method, and each image size is M×N pixels; Without considering the overlap between the fields of view, the actually reconstructed pixels of the target measurement area are equal to M×N×2 pixels; considering the overlap between the fields of view, the actually reconstructed pixels of the target measurement area are greater than M×N×2×95% pixels.

4. The portable complex field of view measuring device according to claim 1, characterized in that: By adjusting the angles θ1 and θ2 between the two optical reflectors and the color combining prism, the two sub-areas of the target measurement area can be simultaneously and completely imaged onto the same image sensor of the same camera.

5. The portable complex field of view measuring device according to claim 1, characterized in that: The external thread for assembling the housing and the camera can be adjusted according to the selected camera model.

6. The portable complex field of view measuring device according to claim 1, characterized in that: The middle part of the shell is provided with two symmetrically distributed bosses for fixing the color combining prism, and the size of a single boss is 10×3×10 mm.

7. The portable complex field of view measuring device according to claim 1, characterized in that: Two symmetrically distributed mounting holes are provided on both sides of the inner side of the shell for mounting two optical adjustment frames.

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