CN102853998A - Variable pitch dynamic goal simulating system and using method thereof - Google Patents

Abstract

The invention discloses a variable pitch dynamic goal simulating system and using method of the variable pitch dynamic goal simulating system, belonging to the field of the optical imaging resolution ratio detection. The system comprises a light source, a resolution ratio rotary drum, a parallel light pipe, a linear displacement device, a grating ruler and a rotary drum rotating shaft; the light emitted by the light source is irradiated on the resolution ratio rotary drum, the rotary drum rotating shaft drives the resolution ratio rotary drum to rotate and generate a dynamic goal; by using the linear displacement device, the position of the resolution ratio rotary drum relative to a focal plane of the parallel light pipe is adjusted, the position movement amount is accurately measured by the grating ruler; the shooting distance of simulating the dynamic goal is calculated; and a ground dynamic goal of an aerial camera is simulated under a certain flying height. By using the linear displacement device, the dynamic goal of the simple linear movement and the parallel light pipe are combined to form a set of simulating systems capable of generating the dynamic goals with different shooting distances; and the imaging ability index of the dynamic goals at different movement speeds can be detected under the condition of different shooting distances of the aerial camera.

Description

Variable distance dynamic target simulation system and its application method

technical field

The invention belongs to the field of optical imaging resolution detection, and relates to a variable-distance dynamic target simulation system and a method for using the same. its detection method.

Background technique

For the detection of the dynamic resolution of the aerial camera, in the past, the method of field aviation calibration flight was usually adopted, and the dynamic resolution of the aerial camera was tested by taking images of ground targets with the aerial camera on the plane. This method is costly and takes a long time. Therefore, it has become a trend to perform laboratory dynamic resolution testing on aerial cameras indoors.

According to the working characteristics of aerial cameras, the imaging indicators and imaging conditions that need to be detected include moving targets, targets at different camera distances, and imaging working indicators under different temperature and air pressure conditions. Currently, there are two types of dynamic target equipment that can generate moving targets, one is Zhou Xingyi's patent "Dynamic Target Generator" (ZL200820071670.2) and He Xu's article "CCD Camera Dynamic Transfer Function Core Test Equipment The design of the drum-type dynamic target generator used in "(Optical Technology, 2010Vol.36, No.3); one is used in the patent "Aerial Camera Dynamic Resolution Detection System" (Application No. 200810050576.3) by An Zhiyong et al. resolution ruler dynamic target generator. Zhou Xingyi and He Xu used the rotating drum dynamic target generator to engrave the national standard resolution plate pattern on the cylindrical surface of the cylindrical drum, and use the rotating motion of the drum to generate dynamic targets; the resolution scale used by An Zhiyong et al. Type dynamic target generator, engrave the national standard resolution plate pattern on the plane of the resolution scale, and use the linear motion of the resolution scale to generate dynamic targets. When these two dynamic target generators are used, the resolution plate pattern of the dynamic target generator is calibrated on the focal plane of the collimator, and the resolution plate pattern moves along the direction perpendicular to the optical axis of the collimator, thereby Simulate a dynamic target at infinity.

However, these two current dynamic target simulation devices can only simulate a dynamic target with an infinite distance. If you want to simulate a dynamic target with a variable distance, you need to move a collimator or a dynamic target simulator. Disadvantages, first, it is inconvenient to operate, second, the registration relationship between the two needs to be readjusted after moving, and third, the distance between the adjusted collimator and the pattern of the target resolution plate cannot be accurately measured, so the actual position of the dynamic target cannot be given. distance.

Contents of the invention

In order to solve the problem that the existing technology can only simulate an infinitely far dynamic target and cannot give the actual distance of the dynamic target, the present invention provides a dynamic target simulation system with variable distance and its use method, which can provide optical dynamic The target is used to detect the dynamic resolution of the aerial camera, and the distance can be given accurately.

The technical solution adopted by the present invention to solve the technical problems is as follows:

One solution is a system solution using a rotary drum type dynamic target generator: the variable pitch dynamic target simulation system includes a light source assembly, a resolution rotary drum, a collimator, a linear displacement device, a grating ruler and a rotary shaft system of a rotary drum; The center of the drum is located on the extension line of the optical axis of the collimator, and the optical axis of the collimator is perpendicular to the tangential direction of the resolution drum. The focal plane coincides; the light emitted by the light source component is irradiated on the resolution drum, and the rotating shaft of the drum drives the rotation of the resolution drum to generate a dynamic target; the resolution drum and the rotating shaft of the drum are installed on the table of the linear displacement device It can move linearly with the linear displacement device along the optical axis of the collimator. The displacement distance of the linear movement is measured by the grating ruler, and the camera distance of the simulated dynamic target is calculated according to the displacement value measured by the grating ruler.

The method for using the above variable distance dynamic target simulation system includes the following steps:

1) Make the optical axis of the aerial camera coincide with the collimator, adjust the center of the resolution drum on the extension line of the common optical axis of the aerial camera and the collimator, adjust the linear displacement device, and adjust the resolution of the resolution drum to The pattern marking surface is adjusted on the focal plane of the collimator, and the value of the line displacement digital display box is set to zero to simulate an infinite target;

2) The control system drives the rotating shaft of the drum to drive the rotation of the resolution drum to generate dynamic targets, control the aerial camera to image the target, and perform resolution detection on the infinite dynamic target;

3) Adjust the linear displacement device to move the resolution drum to the side of the parallel light tube for a distance l. According to the formula H=f ² _{light tube} /l, calculate the simulated target distance H at this time, where the f _{light tube} is parallel light the focal length of the tube;

4) Control the aerial camera to image the target, and perform dynamic resolution detection on the dynamic target with a distance of H;

5) Repeat step 3) and step 4), adjust multiple sets of distance l values to obtain different photographing distances H, and obtain the images formed by the aerial camera on the dynamic resolution board target at different photographing distances, judged by the inspector The detection results of the dynamic target resolution of the camera under different camera distance conditions.

Another scheme is a system scheme using a resolution scale dynamic target generator: the variable distance dynamic target simulation system includes a light source assembly, a resolution scale, a collimator, a linear displacement device, a grating scale, and a translation mechanism for a resolution scale; The marking plane of the scale ruler is perpendicular to the optical axis of the collimator, and the stripe marking surface of the resolution scale coincides with the focal plane of the collimator; the light emitted by the light source component shines on the resolution scale, and the translation mechanism of the resolution scale drives the resolution The scale moves linearly along the direction perpendicular to the optical axis of the collimator to generate a dynamic target; the resolution scale and the translation mechanism of the resolution scale are installed on the table of the linear displacement device, and can follow the linear displacement device along the light direction of the collimator. The linear motion is carried out in the axial direction, and the displacement distance of the linear motion is measured by the grating ruler, and the camera distance of the simulated dynamic target is calculated according to the displacement value measured by the grating ruler.

The method for using the above variable distance dynamic target simulation system includes the following steps:

1) Make the aerial camera coincide with the optical axis of the collimator, make the stripe marking surface of the resolution ruler perpendicular to the optical axis of the collimator, adjust the linear displacement device, and adjust the stripe marking surface of the resolution ruler to the parallel light On the focal plane of the tube, set the value of the linear displacement digital display box to zero to simulate an infinite target;

2) The control system drives the translation mechanism of the resolution ruler to drive the resolution ruler to move linearly along the direction perpendicular to the optical axis of the collimator to generate a dynamic target, control the aerial camera to image the target, and perform resolution detection on the infinite dynamic target;

3) Adjust the linear displacement device so that the resolution scale moves to the side of the collimator for a distance l. According to the formula H=f ² _{light pipe} /l, calculate the simulated target distance H at this time, where the f _{light pipe} is the collimator the focal length;

4) Control the aerial camera to image the target, and perform dynamic resolution detection on the dynamic target with a distance of H;

5) Repeat step 3) and step 4), adjust multiple sets of distance l values to obtain different photographing distances H, and obtain the images formed by the aerial camera on the dynamic resolution board target at different photographing distances, judged by the inspector The detection results of the dynamic target resolution of the camera under different camera distance conditions.

The beneficial effects of the present invention are: the linear displacement device is used to combine a simple linear moving dynamic target with a collimator to form a set of simulation systems that can produce dynamic targets with different photographing distances, which can be used for different photographing heights of aerial cameras. The imaging ability index of the dynamic target of the moving speed is detected. When the linear displacement device is calibrated at the zero position, it can simulate an infinite dynamic target. Adjusting the linear displacement device can change the photographing distance of the dynamic target. The photographing distance is determined by the grating ruler. It is calculated after measuring the movement amount of the linear displacement device.

Description of drawings

Fig. 1 is a schematic diagram of the structure of a dynamic target simulation system with variable distance provided by a resolution drum;

Fig. 2 is a schematic diagram of the structure of a dynamic target simulation system with variable distance provided by a resolution scale.

Figure 3 is a schematic diagram of the instrument layout for detecting the dynamic resolution of an aerial camera using a variable-distance dynamic target simulation system using a resolution drum;

FIG. 4 is a top view of FIG. 3 .

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, the variable-distance dynamic target simulation system of the present invention includes a light source assembly 1, a resolution drum 2, a collimator 3, a linear displacement device 4, a grating ruler 5, and a drum rotation shaft system 6; the light source assembly 1 The resolution drum 2 can be evenly illuminated. The national standard resolution board is engraved on the resolution drum 2. According to the different usage conditions, you can choose the resolution board stripe pattern A1~A7 with different board numbers of the national standard; The center of the drum 2 is located on the extension line of the optical axis of the collimator 3. The optical axis of the collimator 3 is perpendicular to the tangential direction of the resolution drum 2. In the direction of the optical axis, the striped surface of the resolution drum 2 It coincides with the focal plane of the collimator 3; the light emitted by the light source assembly 1 is irradiated on the resolution drum 2, and the rotating shaft system 6 of the drum drives the resolution drum 2 to rotate to generate a dynamic target; the resolution drum 2 and the rotating shaft The drum rotation shaft system 6 is installed on the table of the linear displacement device 4. The linear displacement device 4 is used to adjust the position of the resolution drum 2 relative to the focal plane of the collimator 3, and the position displacement is accurately measured by the grating ruler 5. Calculate the camera distance of the dynamic target simulation, and simulate the ground dynamic target of the aerial camera at a certain flying height.

As shown in Figure 2, the variable distance dynamic target simulation system of the present invention comprises a light source assembly 1, a resolution ruler 7, a collimator 3, a linear displacement device 4, a grating ruler 5 and a resolution ruler translation mechanism 8; the light source assembly 1 uses The resolution ruler 7 can get uniform illumination, and the national standard resolution board is engraved on the resolution ruler 7. According to different usage conditions, you can choose the stripe pattern of the resolution board with different national standard board numbers, and you can also engrave a variety of board numbers. Resolution fringe pattern; the marking plane of the resolution ruler 7 is perpendicular to the optical axis of the collimator 3, and the stripe marking surface of the resolution ruler 7 coincides with the focal plane of the collimator 3; On the rate scale 7, the resolution scale translation mechanism 8 drives the resolution scale 7 to move linearly along the direction perpendicular to the optical axis of the collimator 3 to generate a dynamic target, which forms an infinitely distant dynamic target through the collimator 3; The ruler 7 and the resolution ruler translation mechanism 8 are installed on the table of the linear displacement device 4, and the linear displacement device 4 is used to adjust the position of the resolution ruler 7 relative to the focal plane of the collimator 3, and the position movement amount is adjusted by the grating ruler 5 Accurate measurement, calculate the camera distance of dynamic target simulation, and simulate the ground dynamic target of aerial camera at a certain flying height.

As shown in FIGS. 3 and 4 , the optical axis of the collimator 3 coincides with the optical axis of the camera 10 , and the optical axis of the collimator 3 is perpendicular to the tangential direction of the resolution drum 2 . The resolution drum 2 rotates at a set speed with the drum rotation shaft system 6. The resolution drum 2 and the drum rotation shaft system 6 are installed on the table of the linear displacement device 4, and they can move along with the linear displacement device 4 in parallel. The direction of the optical axis of the light pipe 3 moves linearly, and the displacement distance of the linear motion is measured by the grating ruler 5 and displayed by the linear displacement digital display box 9, and the photographing distance of the simulated dynamic target is calculated according to the displacement value measured by the grating ruler 5 . The camera 10 is controlled to take pictures, to image a dynamic target at a specific photographing distance, and to detect the imaging resolution index.

The detection method of the dynamic target imaging resolution index of different photographing distances of aerial cameras using the resolution drum type variable distance dynamic target simulation system of the present invention is as follows:

1) Make the optical axis of the aerial camera 10 coincide with the collimator 3, adjust the center of the resolution drum 2 on the extension line of the common optical axis of the aerial camera 10 and the collimator 3, adjust the linear displacement device 4, and set the resolution The resolution pattern scoring surface of the rate drum 2 is adjusted on the focal plane of the collimator 3, and the value of the line displacement digital display box 9 is set to zero. At this time, the simulated target is an infinite target;

2) The control system drives the rotating shaft system 6 of the drum to drive the rotation of the resolution drum 2 to generate a dynamic target, controls the aerial camera 10 to image the target, and performs resolution detection on the infinitely distant dynamic target;

3) Adjust the linear displacement device 4 so that the target resolution drum 2 moves a distance l to the side of the collimator 3, and calculate the simulated target distance H at this time according to the formula H=f ² _{light tube} /l, where f _{light Tube} is the focal length of collimator 3;

4) Control the aerial camera 10 to image the target, and perform dynamic resolution detection on the dynamic target with a distance of H;

5) By analogy, by adjusting multiple sets of distance l values, different photographing distances H can be obtained, and the images formed by the aerial camera on the dynamic resolution board target at different photographing distances can be obtained. Dynamic target resolution detection results under different camera distance conditions.

In addition, changing the rotation speed of the resolution drum 2 or changing the moving speed of the resolution scale 7, combined with the setting of different photographing distances, can be used to analyze the dynamic targets of different moving speeds of the aerial camera under different photographing distances. The imaging resolution index is tested.

Claims (4)

1. displacement dynamic object simulation system is characterized in that, this system comprises light source assembly (1), resolution rotary drum (2), parallel light tube (3), linear displacement device (4), grating scale (5) and rotary drum rotation axis system (6); On the extended line that is centered close to parallel light tube (3) optical axis of resolution rotary drum (2), the tangential direction of parallel light tube (3) optical axis vertical resolution rotary drum (2), on optical axis direction, the striped of resolution rotary drum (2) delineation face overlaps with the focal plane of parallel light tube (3); The irradiation that light source assembly (1) sends is on resolution rotary drum (2), and rotary drum rotation axis system (6) drives resolution rotary drum (2) rotation, produces dynamic object; Resolution rotary drum (2) and rotary drum rotation axis system (6) are installed on the table top of linear displacement device (4), and can carry out rectilinear motion along the optical axis direction of parallel light tube (3) with linear displacement device (4), its rectilinear motion shift length is measured by grating scale (5), calculates the photograph distance of the dynamic object of simulating according to the shift value of grating scale (5) measurement.

2. the using method of displacement dynamic object simulation system as claimed in claim 1 is characterized in that the method comprises the steps:

1) with the optical axis coincidence of aerial camera (10) with parallel light tube (3), the center of resolution rotary drum (2) is adjusted on the extended line of aerial camera (10) and the common optical axis of parallel light tube (3), adjust linear displacement device (4), the resolution pattern delineation face of resolution rotary drum (2) is adjusted on the focal plane of parallel light tube (3), numerical value zero setting with displacement of the lines digital display case (9) simulates the infinity target;

2) control system drives rotary drum rotation axis system (6) and drives resolution rotary drum (2) rotation, produces dynamic object, and control aerial camera (10) carries out resolution to the infinity dynamic object and detects target imaging;

3) adjust linear displacement device (4), make resolution rotary drum (2) to parallel light tube (3) one side shiftings apart from l, according to formula H=f ² _{Light pipe}/ l calculates the target range H that simulates this moment, wherein f _{Light pipe}Focal length for parallel light tube (3);

4) control aerial camera (10) is to target imaging, and the dynamic object for H of adjusting the distance carries out dynamic resolution and detects;

5) repeating step 3) and step 4), adjust many groups apart from the l value, obtain different photograph distance H, obtaining aerial camera takes a picture apart from the situation in difference, to the image that dynamic resolution plate target becomes, personnel judge camera dynamic object resolution testing result under difference photograph distance condition after testing.

3. displacement dynamic object simulation system is characterized in that, this system comprises light source assembly (1), resolution chi (7), parallel light tube (3), linear displacement device (4), grating scale (5) and resolution chi translation mechanism (8); The delineation plane of resolution chi (7) is perpendicular to parallel light tube (3) optical axis, and the striped of resolution chi (7) delineation face overlaps with the focal plane of parallel light tube (3); The irradiation that light source assembly (1) sends is on resolution chi (7), and resolution chi translation mechanism (8) drives resolution chi (7) and carries out rectilinear motion along the optical axis direction perpendicular to parallel light tube (3), produces dynamic object; Resolution chi (7) and resolution chi translation mechanism (8) are installed on the table top of linear displacement device (4), and can carry out rectilinear motion along the optical axis direction of parallel light tube (3) with linear displacement device (4), its rectilinear motion shift length is measured by grating scale (5), calculates the photograph distance of the dynamic object of simulating according to the shift value of grating scale (5) measurement.

4. the using method of displacement dynamic object simulation system as claimed in claim 3 is characterized in that the method comprises the steps:

1) with the optical axis coincidence of aerial camera (10) with parallel light tube (3), the striped of resolution chi (7) is delineated face perpendicular to the optical axis of parallel light tube (3), adjust linear displacement device (4), the striped delineation face of resolution chi (7) is adjusted on the focal plane of parallel light tube (3), numerical value zero setting with displacement of the lines digital display case (9) simulates the infinity target;

2) control system driving resolution chi translation mechanism (8) drive resolution chi (7) carries out rectilinear motion along the optical axis direction perpendicular to parallel light tube (3), produce dynamic object, control aerial camera (10) carries out resolution to the infinity dynamic object and detects target imaging;

3) adjust linear displacement device (4), make resolution chi (7) to parallel light tube (3) one side shiftings apart from l, according to formula H=f ² _{Light pipe}/ l calculates the target range H that simulates this moment, wherein f _{Light pipe}Focal length for parallel light tube (3);

4) control aerial camera (10) is to target imaging, and the dynamic object for H of adjusting the distance carries out dynamic resolution and detects;

5) repeating step 3) and step 4), adjust many groups apart from the l value, obtain different photograph distance H, obtaining aerial camera takes a picture apart from the situation in difference, to the image that dynamic resolution plate target becomes, personnel judge camera dynamic object resolution testing result under difference photograph distance condition after testing.

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