CN111432203A - Dynamic transfer function dynamic image generation device and method - Google Patents
Dynamic transfer function dynamic image generation device and method Download PDFInfo
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- CN111432203A CN111432203A CN201910018913.9A CN201910018913A CN111432203A CN 111432203 A CN111432203 A CN 111432203A CN 201910018913 A CN201910018913 A CN 201910018913A CN 111432203 A CN111432203 A CN 111432203A
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Abstract
The invention discloses a dynamic transfer function dynamic image generation device and a generation method, wherein the generation device comprises: the control acquisition system is used for receiving the required image moving speed v input by a user, acquiring the imaging focal length f of the imaging assembly and obtaining the imaging focal length f according to a formula
Calculating to obtain the angular velocity w required by the rotation of the reflector; the rotary table is provided with a rotatable reflector and used for receiving the angular velocity w and driving the reflector to rotate according to the angular velocity w, so that parallel light beams reflected by the rotating reflector form dynamic projection images to meet the test requirement of the dynamic transfer function of the TDI image sensor to be tested. The invention obtains the angular velocity required by the reflector through the calculation of the moving speed and the imaging focal length of the image input by the user, drives the reflector to rotate at the angular velocity through the turntable, leads the reflected light path to be projected to the target surface position of the image sensor through the imaging component, and generates the dynamic image required by the userAnd (4) imaging to complete the dynamic transfer function test of the image sensor.
Description
Technical Field
The invention relates to the technical field of optical detection, in particular to a dynamic transfer function dynamic image generation device and a dynamic transfer function dynamic image generation method.
Background
In the process of testing the TDI image sensor by the drum method, the angular speed of the drum is related to the pixel transfer frequency and the pixel size of the image sensor, the higher the pixel transfer frequency is, the larger the pixel size is, the larger the corresponding drum angular speed is, and as the optical system adopts the reducing system, the moving speed of the target on the image sensor is further reduced, and the rotating speed of the drum needs to be further improved. For large-pixel high-transfer-frequency image sensors, a high-rotation-speed drum is required, and when the rotation speed is required to be higher than the rated value of the drum, the drum cannot provide a corresponding dynamic target.
Disclosure of Invention
The invention aims to solve the technical problem of providing a dynamic transfer function dynamic image generation device and a dynamic transfer function dynamic image generation method, and aims to solve the problems that a high-rotation-speed rotary drum is required for a large-pixel high-transfer-frequency image sensor in the prior art, and when the rotation speed is required to be higher than the rated value of the rotary drum, the rotary drum cannot provide a corresponding dynamic target.
In order to solve the above problem, the present invention provides a dynamic transfer function dynamic image generating apparatus including:
the control acquisition system is used for receiving the required image moving speed v input by a user, acquiring the imaging focal length f of the imaging assembly and calculating the angular speed w required by the rotation of the reflector according to the formula (1);
the rotary table is provided with a rotatable reflector and used for receiving the angular velocity w and driving the reflector to rotate according to the angular velocity w, so that parallel light beams reflected by the rotating reflector form dynamic projection images to meet the test requirement of the dynamic transfer function of the TDI image sensor to be tested.
As a further improvement of the present invention, the dynamic transfer function dynamic image generating apparatus further includes:
the parallel light source is used for emitting parallel light beams, is incident on the reflector and is reflected by the reflector;
the imaging component is arranged on a reflection light path of the reflector, and parallel light beams reflected by the reflector are focused on a target surface of the TDI image sensor to be detected through the imaging component to form a dynamic projection image;
the TDI image sensor to be tested is connected with the control acquisition system, senses the dynamic projection image and generates a sensing signal, the control acquisition system obtains a gray value of the dynamic projection image according to the sensing signal, and a dynamic transfer function value of the TDI image sensor to be tested is obtained through calculation according to the gray value.
In order to solve the above problem, the present invention further provides a dynamic transfer function dynamic image generating method, which includes the following steps:
the control acquisition system receives the required image moving speed v input by a user, acquires the imaging focal length f of the imaging assembly, and calculates the angular speed w required by the rotation of the reflector according to the formula (1);
the turntable receives the angular velocity w and drives the reflector to rotate according to the angular velocity w, so that the parallel light beams reflected by the rotating reflector form dynamic projection images to meet the test requirement of the dynamic transfer function of the TDI image sensor to be tested.
As a further improvement of the present invention, the step of receiving the test rotation speed by the rotating reflection assembly and driving the rotating table of the rotating reflection assembly to rotate according to the test rotation speed further comprises:
the parallel light source emits parallel light beams, and the parallel light beams are incident on the reflector and reflected out by the reflector;
the parallel light beams reflected by the reflector are focused on the target surface of the TDI image sensor to be detected through the imaging component to form a dynamic projection image;
the TDI image sensor to be tested induces the dynamic projection image, generates an induction signal, controls the acquisition system to obtain a gray value of the dynamic projection image according to the induction signal, and calculates a dynamic transfer function value of the TDI image sensor to be tested according to the gray value.
Compared with the prior art, the method and the device have the advantages that the required image moving speed input by a user is obtained, the angular speed required by the reflector is calculated according to the image moving speed and the imaging focal length of the imaging assembly, the reflector is driven to rotate at the angular speed through the turntable, the reflected light path is projected to the target surface position of the image sensor through the imaging optical system, the dynamic image of the moving speed required by the user is generated, the dynamic transfer function test of the image sensor is completed, the moving speed of the target image is related to the rotating speed of the high-precision turntable and the focal length of the imaging system, and the higher the rotating speed and the longer the focal length are, the faster the moving speed of the target image is. Usually, the focal length of the imaging system is larger than 20mm, and the target image can move at high speed only by a certain rotating speed.
Drawings
FIG. 1 is a schematic structural diagram of a dynamic transfer function image generating apparatus according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of an imaging principle of a dynamic transfer function dynamic image generating apparatus according to a first embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a dynamic transfer function image generating apparatus according to a second embodiment of the present invention;
FIG. 4 is a flowchart illustrating a dynamic transfer function dynamic image generating method according to a first embodiment of the present invention;
FIG. 5 is a flowchart illustrating a dynamic transfer function dynamic image generating method according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 and fig. 2 show an embodiment of a dynamic transfer function dynamic image generation apparatus of the present invention, referring to fig. 1, in this embodiment, the dynamic transfer function dynamic image generation apparatus includes a control acquisition system 1 and a turntable 2, where the control acquisition system 1 is configured to receive a required image moving speed v input by a user, acquire an imaging focal length f of an imaging assembly, and calculate an angular speed w required for rotation of a mirror 21 according to formula (1);
the turntable 2 is provided with a rotatable reflector 21, and the turntable 2 is used for receiving an angular velocity w and driving the reflector 21 to rotate according to the angular velocity w, so that parallel light beams reflected by the rotating reflector 21 form a dynamic projection image to meet the test requirement of the dynamic transfer function of the TDI image sensor to be tested.
Referring to fig. 2, specifically, when two parallel lights spaced by a preset time period t are incident to the imaging assembly, and an included angle between the two parallel lights is θ, a moving distance of the target image within the preset time period t is a product of a focal length and a tangent value of the included angle, that is, l ═ f · tan θ, and a moving speed of the image is θ
Since the angle theta of the parallel light sweeping the imaging assembly at the preset time interval t is small during the imaging process, the moving speed of the target image is approximately equal to that of the imaging assembly
And is derived from the formula
Will be provided with
Substitution into
The above formula (1) can be obtained.
The invention obtains the required image moving speed input by a user, calculates the required angular speed of the reflector according to the image moving speed and the imaging focal length of the imaging component, drives the reflector to rotate at the angular speed through the turntable, enables the reflected light path to be projected to the target surface position of the image sensor through the imaging optical system, and generates the dynamic image of the moving speed required by the user so as to complete the dynamic transfer function test of the image sensor, and the moving speed of the target image is related to the rotating speed of the high-precision turntable and the focal length of the imaging system, and the higher the rotating speed and the longer the focal length are, the faster the moving speed of the target image is. Usually, the focal length of the imaging system is larger than 20mm, and the target image can move at high speed only by a certain rotating speed.
In order to obtain the dynamic transfer function value of the TDI image sensor to be measured, referring to fig. 3 on the basis of the above embodiment, in this embodiment, the dynamic transfer function image generating device further includes a parallel light source 3, an imaging component 4 and the TDI image sensor to be measured 5, where the parallel light source 3 is configured to emit a parallel light beam, and is incident on the reflector 21 and reflected by the reflector 21; the imaging component 4 is arranged on a reflection light path of the reflector 21, and parallel light beams reflected by the reflector 21 are focused on a target surface of the TDI image sensor 5 to be detected through the imaging component 4 to form a dynamic projection image; the TDI image sensor 5 to be tested is connected with the control acquisition system 1, the TDI image sensor 5 to be tested induces the dynamic projection image and generates an induction signal, the control acquisition system 1 obtains a gray value of the dynamic projection image according to the induction signal, and a dynamic transfer function value of the TDI image sensor 5 to be tested is obtained through calculation according to the gray value.
Specifically, after the control acquisition system 1 controls the turntable 2 to rotate at a constant speed, the parallel light source 3 emits parallel light, which passes through the reflector 21 and is incident on the reflector 21 and reflected by the reflector 21; the imaging component 4 is arranged on a reflection light path of the reflector 21, and parallel light beams reflected by the reflector 21 are focused on a target surface of the TDI image sensor 5 to be detected through the imaging component 4 to form a dynamic projection image.
In the embodiment, parallel light is reflected by the rotating reflector 21, so that the reflected parallel light is in a rotating and sweeping motion state, and is swept by the imaging component 4 through the moving parallel light and focused onto the target surface of the TDI image sensor 5 to be detected through the imaging component 4 to form a dynamic projection image; the TDI image sensor 5 to be detected is connected with the control acquisition system 1, the TDI image sensor 5 to be detected induces the dynamic projection image and generates an induction signal, the control acquisition system 1 obtains a gray value of the dynamic projection image according to the induction signal, and obtains a dynamic transfer function value of the TDI image sensor 5 to be detected through calculation according to the gray value.
Fig. 4 shows an embodiment of a dynamic transfer function dynamic image generation method of the present invention, and referring to fig. 4, in this embodiment, the generation method includes the following steps:
step S1, controlling the acquisition system to receive the required image moving speed v input by the user, acquiring the imaging focal length f of the imaging assembly, and calculating the angular speed w required by the rotation of the reflector according to the formula (1);
and step S2, the turntable receives the angular velocity w and drives the reflector to rotate according to the angular velocity w, so that the parallel light beams reflected by the rotating reflector form dynamic projection images to meet the test requirement of the dynamic transfer function of the TDI image sensor to be tested.
In the embodiment, the dynamic target is generated by high-speed folding of the light path in the optical system and projection to the target surface position of the image sensor through the imaging optical system, so that the dynamic transfer function test of the image sensor is realized, the moving speed of the target image is related to the rotating speed of the high-precision turntable and the focal length of the imaging system, and the higher the rotating speed and the longer the focal length are, the faster the moving speed of the target image is. Usually, the focal length of the imaging system is larger than 20mm, and the target image can move at high speed only by a certain rotating speed.
In the base yarn of the above embodiment, referring to fig. 5, in the present embodiment, after step S2, further includes:
step S21, the parallel light source emits parallel light beams, and the parallel light beams are incident on the reflector and reflected by the reflector;
step S22, focusing the parallel light beams reflected by the reflecting mirror onto the target surface of the TDI image sensor to be detected through the imaging component to form a dynamic projection image;
and step S23, the TDI image sensor to be tested induces the dynamic projection image, generates an induction signal, controls the acquisition system to obtain the gray value of the dynamic projection image according to the induction signal, and calculates the dynamic transfer function value of the TDI image sensor to be tested according to the gray value.
In the embodiment, parallel light is reflected by a rotating reflector, so that the reflected parallel light is in a rotating and scanning motion state, and is focused on a target surface of a TDI image sensor to be detected through an imaging component by the moving parallel light scanning imaging component to form a dynamic projection image; the TDI image sensor to be detected is connected with the control acquisition system, the TDI image sensor to be detected induces the dynamic projection image and generates an induction signal, the control acquisition system obtains the gray value of the dynamic projection image according to the induction signal, and the dynamic transfer function value of the TDI image sensor to be detected is obtained through calculation according to the gray value.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the expanded contents of the method embodiment in this specification, since the expanded contents are similar to those of the apparatus embodiment, detailed description is not repeated, and for the relevant points, reference may be made to part of the description of the expanded contents of the apparatus embodiment.
The embodiments of the present invention have been described in detail, but the present invention is only exemplary and is not limited to the embodiments described above. It will be apparent to those skilled in the art that any equivalent modifications or substitutions can be made within the scope of the present invention, and thus, equivalent changes and modifications, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.
Claims (4)
1. A dynamic transfer function dynamic image generating apparatus, comprising:
the control acquisition system is used for receiving the required image moving speed v input by a user, acquiring the imaging focal length f of the imaging assembly, and calculating the angular speed w required by the rotation of the reflector according to the formula (1);
and the turntable is provided with a rotatable reflector, and the turntable is used for receiving the angular velocity w and driving the reflector to rotate according to the angular velocity w, so that the parallel light beams reflected by the rotating reflector form a dynamic projection image to meet the test requirement of the dynamic transfer function of the TDI image sensor to be tested.
2. The dynamic transfer function dynamic image generating apparatus according to claim 1, characterized by further comprising:
the parallel light source is used for emitting parallel light beams, is incident on the reflector and is reflected by the reflector;
the imaging component is arranged on a reflection light path of the reflector, and parallel light beams reflected by the reflector are focused on a target surface of the TDI image sensor to be detected through the imaging component to form the dynamic projection image;
the TDI image sensor to be detected is connected with the control acquisition system, the TDI image sensor to be detected induces the dynamic projection image and generates an induction signal, the control acquisition system obtains a gray value of the dynamic projection image according to the induction signal, and a dynamic transfer function value of the TDI image sensor to be detected is obtained through calculation according to the gray value.
3. A dynamic transfer function dynamic image generation method is characterized by comprising the following steps:
the control acquisition system receives the required image moving speed v input by a user, acquires the imaging focal length f of the imaging assembly, and calculates the angular speed w required by the rotation of the reflector according to the formula (1);
and the turntable receives the angular velocity w and drives the reflector to rotate according to the angular velocity w, so that the parallel light beams reflected by the rotating reflector form dynamic projection images to meet the test requirement of the dynamic transfer function of the TDI image sensor to be tested.
4. The dynamic transfer function dynamic image generation method as claimed in claim 3, wherein the step of receiving the test rotation speed by the rotating reflection assembly and driving a rotating table of the rotating reflection assembly to rotate according to the test rotation speed further comprises:
the parallel light source emits parallel light beams, and the parallel light beams are incident on the reflector and reflected out by the reflector;
the parallel light beams reflected by the reflector are focused on the target surface of the TDI image sensor to be detected through the imaging component to form the dynamic projection image;
the TDI image sensor to be tested induces the dynamic projection image and generates an induction signal, the control acquisition system obtains a gray value of the dynamic projection image according to the induction signal, and a dynamic transfer function value of the TDI image sensor to be tested is obtained through calculation according to the gray value.
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| CN101354307A (en) * | 2008-09-22 | 2009-01-28 | 哈尔滨工业大学 | Apparatus and method for measuring dynamic target modulation transfer function |
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| CN108243337A (en) * | 2017-12-28 | 2018-07-03 | 长春长光精密仪器集团有限公司 | A kind of imaging sensor dynamic transfer function test phase alignment means |
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Patent Citations (3)
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| CN101354307A (en) * | 2008-09-22 | 2009-01-28 | 哈尔滨工业大学 | Apparatus and method for measuring dynamic target modulation transfer function |
| CN102538823A (en) * | 2011-12-29 | 2012-07-04 | 中国科学院长春光学精密机械与物理研究所 | System for detecting matching error of TDICCD (Time Delay and Integration Charge Coupled Device) focal plane different-speed imaging |
| CN108243337A (en) * | 2017-12-28 | 2018-07-03 | 长春长光精密仪器集团有限公司 | A kind of imaging sensor dynamic transfer function test phase alignment means |
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