CN110446035B - Testing system for dynamic shooting ambiguity of camera - Google Patents
Testing system for dynamic shooting ambiguity of camera Download PDFInfo
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- CN110446035B CN110446035B CN201910882224.2A CN201910882224A CN110446035B CN 110446035 B CN110446035 B CN 110446035B CN 201910882224 A CN201910882224 A CN 201910882224A CN 110446035 B CN110446035 B CN 110446035B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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Abstract
The embodiment of the invention discloses a system for testing the dynamic shooting ambiguity of a camera. The test system includes: the code disc is provided with a plurality of reference icons; the motor is used for driving the code disc to rotate; a driving circuit for providing a driving voltage for the rotation of the motor; the microprocessor is connected to the driving circuit and the code disc and used for providing motor control signals for the driving circuit, the driving circuit is used for driving the motor to rotate the code disc at a preset speed according to the motor control signals so that a camera to be detected can shoot a reference icon on the code disc rotating at the preset speed to obtain a dynamic icon image, and the dynamic icon image is used for analyzing the dynamic shooting ambiguity of the camera to be detected. The embodiment of the invention realizes high-efficiency test of the dynamic shooting ambiguity of the camera.
Description
Technical Field
The embodiment of the invention relates to a camera testing technology, in particular to a testing system for dynamic shooting ambiguity of a camera.
Background
In the application fields of aerial photography, surveying and mapping, when a camera is carried on a dynamic platform (such as an unmanned plane with fixed wings, rotary wings and the like) to carry out photographing operation, the quality control requirement of a final image is met, the ambiguity of a photo obtained by dynamic photographing is required to be specific, and only if the ambiguity is controlled within a certain range, the quality of a finally generated image data result can be ensured to meet the application requirement and acceptance criteria. Therefore, at the beginning of the design of the aerial survey system, tools are needed for the model selection of the camera and the determination of the parameters of the camera to assist in realizing the simulation test of the dynamic shooting of the camera so as to test the motion blur degree of the shooting of the camera.
The current general method for testing is to mount the camera to be tested on a flight test platform, such as a fixed wing unmanned aerial vehicle, to carry out actual flying, then analyze the photographed picture to determine whether the motion blur meets the application requirement, so as to determine whether the camera to be tested can be applied to a specific project or integrated into a specific product. The camera shooting motion blur to be tested is evaluated through the processing mode, the test result can be obtained, but the flight platform (such as a fixed wing unmanned aerial vehicle), the flight field, the climate and the staff put into test are required correspondingly, and the workload required to be put into practice is large.
Disclosure of Invention
The embodiment of the invention provides a system for testing camera dynamic shooting ambiguity, which is used for testing the camera dynamic shooting ambiguity with high efficiency.
To achieve the object, an embodiment of the present invention provides a system for testing camera dynamic shooting ambiguity, the system comprising:
The code disc is provided with a plurality of reference icons; the motor is used for driving the code disc to rotate; a driving circuit for providing a driving voltage for the rotation of the motor; the microprocessor is connected to the driving circuit and the code disc and used for providing motor control signals for the driving circuit, the driving circuit is used for driving the motor to rotate the code disc at a preset speed according to the motor control signals so that a camera to be detected can shoot a reference icon on the code disc rotating at the preset speed to obtain a dynamic icon image, and the dynamic icon image is used for analyzing the dynamic shooting ambiguity of the camera to be detected.
Further, the test system further comprises: and the power supply is used for providing working voltages for the motor and the microprocessor respectively.
Further, the code wheel is circular in shape, and the plurality of reference icons are arranged in the radial direction.
Further, the test system further comprises: the circular magnet is coaxially arranged with the motor and is used for rotating at the same speed with the code disc; and the magnetic angle sensor is electrically connected with the microprocessor and is used for acquiring the angular velocity of the round magnet when the round magnet rotates, and the microprocessor is also used for confirming the linear velocities of the reference icons arranged along the radial direction under different radiuses according to the angular velocity so as to provide a plurality of linear velocities corresponding to the dynamic icon images for analysis.
Preferably, the distance between the magnetic angle sensor and the circular magnet is less than 2 mm.
Further, the microprocessor further comprises a camera interface used for being connected with the camera to be tested, and the camera to be tested is used for sending the photographed dynamic icon image to the microprocessor through the camera interface.
Further, the focal plane of the camera to be tested is in the same plane with the code disc.
Optionally, the test system further comprises a display screen and a display screen driving circuit, and the microprocessor is further used for controlling the display screen driving circuit to drive the display screen to display.
Further, the display screen is a touch screen, the display screen is used for displaying a test control interface, and the touch screen generates a touch instruction according to the operation of a user on the test control interface and sends the touch instruction to the microprocessor.
Optionally, the test system further includes an upper computer connected to the microprocessor, where the microprocessor is further configured to control the upper computer to display, and the upper computer is configured to send a control instruction to the microprocessor.
The embodiment of the invention provides a code disc provided with a plurality of reference icons; the motor is used for driving the code wheel to rotate; a driving circuit for supplying a driving voltage for motor rotation; the microprocessor is connected to the driving circuit and the code disc and used for providing motor control signals for the driving circuit, the driving circuit is used for driving the motor to rotate the code disc at a preset speed according to the motor control signals so that a camera to be detected can shoot a reference icon on the code disc rotating at the preset speed to obtain a dynamic icon image, and the dynamic icon image is used for analyzing the dynamic shooting ambiguity of the camera to be detected. The problem that the existing test camera takes time and labor for dynamic shooting of the ambiguity is solved, and the effect of high-efficiency test camera dynamic shooting ambiguity is achieved.
Drawings
Fig. 1 is a schematic block diagram of a camera dynamic shooting ambiguity test system according to an embodiment of the present invention;
Fig. 2 is a schematic block diagram of a camera dynamic shooting ambiguity test system according to a second embodiment of the present invention;
Fig. 3 is a schematic diagram of a dynamic icon image captured by a camera dynamic capturing ambiguity test system according to a first embodiment and a second embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are for purposes of illustration and not of limitation. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Furthermore, the terms "first," "second," and the like, may be used herein to describe various directions, acts, steps, or elements, etc., but these directions, acts, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. For example, a first speed difference may be referred to as a second speed difference, and similarly, a second speed difference may be referred to as a first speed difference, without departing from the scope of the application. Both the first speed difference and the second speed difference are speed differences, but they are not the same speed difference. The terms "first," "second," and the like, are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Example 1
As shown in fig. 1 and 3, a first embodiment of the present invention provides a system for testing dynamic photographing ambiguity of a camera, which includes a code wheel 100, a motor 200, a driving circuit 210 and a microprocessor 400.
The code wheel 100 is provided with a plurality of reference icons 120. Preferably, the code wheel 100 is circular in shape, and the plurality of reference icons 120 are arranged in a radial direction. The motor 200 is used for driving the code wheel 100 to rotate. The driving circuit 210 is used for providing a driving voltage for the rotation of the motor 200. Microprocessor 400 is connected to the drive circuit 210 and the code wheel 100. The microprocessor 400 is used to provide motor 200 control signals to the drive circuit 210. The driving circuit 210 is configured to drive the motor 200 to rotate the code wheel 100 at a preset speed according to the control signal of the motor 200, so that the camera to be tested photographs the reference icon 120 on the code wheel 100 rotating at the preset speed to obtain the dynamic icon image 110. The dynamic icon image 110 is used for analyzing the dynamic shooting ambiguity of the camera to be tested.
In this embodiment, the plurality of reference icons 120 on the circular code wheel 100 are a plurality of stripe patterns with high contrast. After the camera photographs the stripe pattern, since the stripe pattern has a high contrast and is radially arranged on the circular code wheel 100, the human eyes or the machine can easily recognize the ambiguity of the photographed dynamic icon image 110. The motor 200 is a direct current motor. The microprocessor 400 adopts a 32-bit singlechip, the model is STM32F103R8T6, the working voltage is 3.3V, and the main frequency of the system is set to 72MHz. The motor control signal sent by the microprocessor 400 is a pulse width modulation signal, and the driving circuit 210 drives the motor 200 to rotate at different speeds according to the magnitude of the pulse width duty ratio, wherein the higher the duty ratio of the pulse width modulation signal, the higher the rotating speed of the motor 200. Specifically, the driving circuit 210 includes a MOS transistor and a pulse width signal chip for controlling the MOS transistor, where the pulse width signal chip provides pulse width adjustment signals with different duty ratios to control the on duration and the off duration of the MOS transistor, corresponding to the same motor rotation speed, the ratio of the on duration to the off duration of the MOS transistor is fixed, corresponding to different motor rotation speeds, and the ratio of the on duration to the off duration of the MOS transistor is different, so as to realize rapid switching of the MOS transistor, and generate corresponding current to drive the motor 200 to rotate.
Further, the test system further includes a power supply 300, a circular magnet 600, and a magnetic angle sensor 500. The power supply 300 is used to supply operating voltages to the motor 200 and the microprocessor 400, respectively. The circular magnet 600 is coaxially disposed with the motor 200 and rotates at the same speed as the code wheel 100. A magnetic angle sensor 500 is electrically connected to the microprocessor 400 for acquiring an angular velocity of the circular magnet 600 when it rotates. The microprocessor 400 is further configured to confirm the linear velocities of the reference icons 120 arranged along the radial direction at different radii according to the angular velocity, so as to provide a plurality of linear velocities corresponding to the dynamic icon image 110 for analysis. Preferably, the distance between the magnetic angle sensor 500 and the circular magnet 600 is less than 2 mm.
In this embodiment, the power supply 300 includes two paths of regulated power supplies, the first path of regulated power supply 320 outputs the second voltage of 5v and 5a to the motor 200, the second path of regulated power supply 310 outputs the first voltage of 3.3v and 3a to the microprocessor 400, and the two paths of regulated power supplies 300 are implemented by using switching power supply chips and matching with peripheral components such as capacitors, inductors, freewheeling diodes, etc. The power supply 300 can stabilize the 7V-20V wide voltage input by the external power supply into the required first voltage and second voltage, and the output voltage is low in noise and ripple, the alternating current ripple of the first path of voltage-stabilized power supply 310 is less than or equal to 10mV, and the alternating current ripple of the second path of voltage-stabilized power supply 320 is less than or equal to 20mV.
In addition, the magnetic angle sensor 500 is a hall angle sensor, the model is MA730, the MA730 chip has a 14-bit result data output, the angle measurement resolution is 0.02 degrees, the supported operating temperature range is-40 degrees celsius to 125 degrees celsius, and the supported rotational speed measurement range is 0 revolutions per minute to 60,000 revolutions per minute. The magnetic angle sensor 500 interacts with the microprocessor 400 via SPI (SERIAL PERIPHERAL INTERFACE ). The circular magnet 600 is a radial chargeable circular magnet 600, and the magnetic angle sensor 500 can measure the real-time angle of the circular magnet 600 coaxially and fixedly connected with the motor 200 through a magnetic line angle sensing mode, and according to the change of the angle, the rotation speed of the circular magnet 600, that is, the rotation angular speed of the motor 200 is measured. The distance between the magnetic angle sensor 500 and the circular magnet 600 is less than 2mm to ensure the angle measurement accuracy.
Further, the microprocessor 400 further includes a camera interface 700 for connecting with the camera to be tested, and the camera to be tested is used for sending the photographed dynamic icon image 110 to the microprocessor 400 through the camera interface 700. The focal plane of the camera to be measured is in the same plane as the code wheel 100.
Optionally, the test system further includes a display 800 and a display driver circuit 810. The microprocessor 400 is further configured to control the display driving circuit 810 to drive the display 800 to display. Further, the display screen 800 is a touch screen, and the display screen 800 is configured to display a test control interface, and the touch screen generates a touch instruction according to the operation of the user on the test control interface and sends the touch instruction to the microprocessor 400.
Specifically, when a photographing test is required, the camera to be tested is first installed and placed at a position with a preset distance from the test system, and distance data of the position is recorded. Then, the camera to be tested confirms that the code wheel 100 is completely in the range of the view-finding frame of the camera to be tested, confirms that the focal plane of the camera to be tested is parallel to the plane of the code wheel 100, and finally sets and records functional parameters of the camera to be tested, such as a shutter, an aperture, an ISO value, exposure compensation and the like. After recording the data, the user can input the data to the microprocessor 400 through the test control interface in the touch screen to wait for analysis, continuously input the preset speed required for the rotation of the code wheel 100, and start the camera test. When the motor 200 drives the code wheel 100 to reach a preset rotation speed, the camera to be tested is controlled to shoot different reference pictures with high contrast ratio to obtain the dynamic icon image 110, and after shooting is finished, the camera to be tested is connected with the microprocessor 400 through the camera interface 700, so that the microprocessor 400 obtains the shot dynamic icon image 110. At this time, the microprocessor 400 can be controlled by a touch screen to analyze the dynamic shooting ambiguity of the camera to be tested according to the recorded parameters and data.
In an alternative embodiment, microprocessor 400 may transmit recorded parameters and data to a specialized image analysis tool for pixel-level detection contrast and quantitative analysis to determine dynamic capture ambiguity of the camera under test.
In an alternative embodiment, the microprocessor 400 is electrically connected to the camera, and the microprocessor 400 can directly control the camera to take pictures without manual control, and after the rotation speed of the code wheel 100 reaches the preset speed, the microprocessor 400 can control the camera to take pictures according to preset parameters.
Example two
As shown in fig. 2 and 3, the second embodiment of the present invention is further optimized based on the first embodiment of the present invention, and provides a system for testing dynamic photographing ambiguity of a camera, which includes a code wheel 100, a motor 200, a driving circuit 210 and a microprocessor 400.
The code wheel 100 is provided with a plurality of reference icons 120. Preferably, the code wheel 100 is circular in shape, and the plurality of reference icons 120 are arranged in a radial direction. The motor 200 is used for driving the code wheel 100 to rotate. The driving circuit 210 is used for providing a driving voltage for the rotation of the motor 200. Microprocessor 400 is connected to the drive circuit 210 and the code wheel 100. The microprocessor 400 is used to provide motor 200 control signals to the drive circuit 210. The driving circuit 210 is configured to drive the motor 200 to rotate the code wheel 100 at a preset speed according to the control signal of the motor 200, so that the camera to be tested photographs the reference icon 120 on the code wheel 100 rotating at the preset speed to obtain the dynamic icon image 110. The dynamic icon image 110 is used for analyzing the dynamic shooting ambiguity of the camera to be tested.
In this embodiment, the plurality of reference icons 120 on the circular code wheel 100 are a plurality of stripe patterns with high contrast. After the camera photographs the stripe pattern, since the stripe pattern has a high contrast and is radially arranged on the circular code wheel 100, the human eyes or the machine can easily recognize the ambiguity of the photographed dynamic icon image 110. The motor 200 is a direct current motor. The microprocessor 400 adopts a 32-bit singlechip, the model is STM32F103R8T6, the working voltage is 3.3V, and the main frequency of the system is set to 72MHz. The motor control signal sent by the microprocessor 400 is a pulse width modulation signal, and the driving circuit 210 drives the motor 200 to rotate at different speeds according to the magnitude of the pulse width duty ratio, wherein the higher the duty ratio of the pulse width modulation signal, the higher the rotating speed of the motor 200. Specifically, the driving circuit 210 includes a MOS transistor and a pulse width signal chip for controlling the MOS transistor, where the pulse width signal chip provides pulse width adjustment signals with different duty ratios to control the on duration and the off duration of the MOS transistor, corresponding to the same motor rotation speed, the ratio of the on duration to the off duration of the MOS transistor is fixed, corresponding to different motor rotation speeds, and the ratio of the on duration to the off duration of the MOS transistor is different, so as to realize rapid switching of the MOS transistor, and generate corresponding current to drive the motor 200 to rotate.
Further, the test system further includes a power supply 300, a circular magnet 600, and a magnetic angle sensor 500. The power supply 300 is used to supply operating voltages to the motor 200 and the microprocessor 400, respectively. The circular magnet 600 is coaxially disposed with the motor 200 and rotates at the same speed as the code wheel 100. A magnetic angle sensor 500 is electrically connected to the microprocessor 400 for acquiring an angular velocity of the circular magnet 600 when it rotates. The microprocessor 400 is further configured to confirm the linear velocities of the reference icons 120 arranged along the radial direction at different radii according to the angular velocity, so as to provide a plurality of linear velocities corresponding to the dynamic icon image 110 for analysis. Preferably, the distance between the magnetic angle sensor 500 and the circular magnet 600 is less than 2 mm.
In this embodiment, the power supply 300 includes two paths of regulated power supplies, the first path of regulated power supply 320 outputs the second voltage of 5v and 5a to the motor 200, the second path of regulated power supply 310 outputs the first voltage of 3.3v and 3a to the microprocessor 400, and the two paths of regulated power supplies 300 are implemented by using switching power supply chips and matching with peripheral components such as capacitors, inductors, freewheeling diodes, etc. The power supply 300 can stabilize the 7V-20V wide voltage input by the external power supply into the required first voltage and second voltage, and the output voltage is low in noise and ripple, the alternating current ripple of the first path of voltage-stabilized power supply 310 is less than or equal to 10mV, and the alternating current ripple of the second path of voltage-stabilized power supply 320 is less than or equal to 20mV.
In addition, the magnetic angle sensor 500 is a hall angle sensor, the model is MA730, the MA730 chip has a 14-bit result data output, the angle measurement resolution is 0.02 degrees, the supported operating temperature range is-40 degrees celsius to 125 degrees celsius, and the supported rotational speed measurement range is 0 revolutions per minute to 60,000 revolutions per minute. The magnetic angle sensor 500 interacts with the microprocessor 400 via SPI (SERIAL PERIPHERAL INTERFACE ). The circular magnet 600 is a radial chargeable circular magnet 600, and the magnetic angle sensor 500 can measure the real-time angle of the circular magnet 600 coaxially and fixedly connected with the motor 200 through a magnetic line angle sensing mode, and according to the change of the angle, the rotation speed of the circular magnet 600, that is, the rotation angular speed of the motor 200 is measured. The distance between the magnetic angle sensor 500 and the circular magnet 600 is less than 2mm to ensure the angle measurement accuracy.
Further, the microprocessor 400 further includes a camera interface 700 for connecting with the camera to be tested, and the camera to be tested is used for sending the photographed dynamic icon image 110 to the microprocessor 400 through the camera interface 700. The focal plane of the camera to be measured is in the same plane as the code wheel 100.
Optionally, the test system further includes a host computer 900 connected to the microprocessor 400, where the microprocessor 400 is further configured to control the host computer 900 to display, and the host computer 900 is configured to send a control instruction to the microprocessor 400.
Specifically, when a photographing test is required, the camera to be tested is first installed and placed at a position with a preset distance from the test system, and distance data of the position is recorded. Then, the camera to be tested confirms that the code wheel 100 is completely in the range of the view-finding frame of the camera to be tested, confirms that the focal plane of the camera to be tested is parallel to the plane of the code wheel 100, and finally sets and records functional parameters of the camera to be tested, such as a shutter, an aperture, an ISO value, exposure compensation and the like. After recording the data, the user can input the data to the upper computer 900 to wait for analysis, continue to input the preset speed at which the code wheel 100 is required to rotate, and start the camera test. When the motor 200 drives the code wheel 100 to reach a preset rotation speed, the camera to be tested is controlled to shoot different reference pictures with high contrast ratio to obtain the dynamic icon image 110, and after shooting is finished, the camera to be tested is connected with the microprocessor 400 through the camera interface 700, so that the microprocessor 400 obtains the shot dynamic icon image 110. At this time, the microprocessor 400 can be controlled by the upper computer 900 to transmit the recorded parameters and data to the upper computer 900, and the detection contrast and quantitative analysis of the pixel level can be performed by the professional image analysis software in the upper computer 900 to determine the dynamic shooting ambiguity of the camera to be tested.
In an alternative embodiment, the microprocessor 400 is electrically connected to the camera, and the microprocessor 400 can directly control the camera to take pictures without manual control, and after the rotation speed of the code wheel 100 reaches the preset speed, the microprocessor 400 can control the camera to take pictures according to preset parameters.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the above embodiments, but may include many other equivalent embodiments without departing from the spirit of the invention, the scope of which is determined by the scope of the appended claims.
Claims (6)
1. A test system for testing camera dynamic photographing ambiguity, comprising:
the code disc is provided with a plurality of reference icons;
the motor is used for driving the code disc to rotate;
a driving circuit for providing a driving voltage for the rotation of the motor;
The microprocessor is connected to the driving circuit and the code disc and used for providing a motor control signal for the driving circuit, the driving circuit is used for driving the motor to rotate the code disc at a preset speed according to the motor control signal so that a camera to be detected shoots a reference icon on the code disc rotating at the preset speed to obtain a dynamic icon image, and the dynamic icon image is used for analyzing the dynamic shooting ambiguity of the camera to be detected;
The power supply is used for providing working voltages for the motor and the microprocessor respectively;
The shape of the code disc is circular, and the plurality of reference icons are arranged along the radial direction;
the circular magnet is coaxially arranged with the motor and is used for rotating at the same speed with the code disc;
The magnetic angle sensor is electrically connected with the microprocessor and is used for acquiring the angular velocity of the round magnet when the round magnet rotates, and the microprocessor is also used for confirming the linear velocities of the reference icons arranged along the radial direction under different radiuses according to the angular velocity so as to provide a plurality of linear velocities corresponding to the dynamic icon images for analysis;
The distance between the magnetic angle sensor and the circular magnet is less than 2 mm;
the reference icons are a plurality of stripe patterns with high contrast;
The magnetic angle sensor is a Hall angle sensor;
The power supply comprises two paths of voltage-stabilized power supplies, wherein the first path of voltage-stabilized power supply outputs 5V and 5A second voltage to the motor, and the second path of voltage-stabilized power supply outputs 3.3V and 3A first voltage to the microprocessor.
2. The test system of claim 1, wherein the microprocessor further comprises a camera interface for interfacing with the camera under test, the camera under test for transmitting captured dynamic icon images to the microprocessor via the camera interface.
3. The test system of claim 1, wherein a focal plane of the camera under test is in a same plane as the code wheel.
4. The test system of claim 1, further comprising a display screen and a display screen drive circuit, wherein the microprocessor is further configured to control the display screen drive circuit to drive the display screen to display.
5. The test system of claim 4, wherein the display screen is a touch screen, the display screen is configured to display a test control interface, and the touch screen generates a touch instruction according to an operation of a user on the test control interface and sends the touch instruction to the microprocessor.
6. The test system of claim 1, further comprising a host computer coupled to the microprocessor, the microprocessor further configured to control the host computer to display, the host computer configured to send control instructions to the microprocessor.
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