CN111432203A - Dynamic transfer function dynamic image generation device and method - Google Patents

Abstract

The invention discloses a dynamic transfer function dynamic image generating device and generating method, wherein the generating device comprises: controlling an acquisition system, controlling the acquisition system to receive a required image moving speed v input by a user, and obtaining an imaging focal length f of an imaging component , and according to the formula

The angular velocity w required for the rotation of the mirror is calculated; the turntable is provided with a rotatable mirror, and the turntable is used to receive the angular velocity w, and drive the mirror to rotate according to the angular velocity w, so that the parallel beam reflected by the mirror during the rotation forms a dynamic projection The image meets the testing requirements of the dynamic transfer function of the TDI image sensor to be tested. The invention calculates the required angular velocity of the mirror through the moving speed of the image input by the user and the imaging focal length, and drives the mirror to rotate at the angular velocity through the turntable, so that the reflected light path is projected to the target surface position of the image sensor through the imaging component to generate the required angular velocity of the mirror. dynamic image to complete the image sensor dynamic transfer function test.

Description

Dynamic transfer function dynamic image generation device and generation method

technical field

The invention relates to the technical field of optical detection, and in particular, to a dynamic transfer function dynamic image generating device and generating method.

Background technique

At present, in the process of testing TDI image sensors by the drum method, the angular velocity of the drum is related to the pixel transfer frequency and pixel size of the image sensor. The higher the pixel transfer frequency and the larger the pixel size, the higher the corresponding drum angular velocity. Since the optical system adopts a reduction system, the moving speed of the target on the image sensor is further reduced, and the rotation speed of the drum needs to be further increased. For image sensors with large pixels and high transfer frequency, a drum with a higher rotation speed is required. When the rotation speed requirement is higher than the rated value of the drum, the drum cannot provide the corresponding dynamic target.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a dynamic transfer function dynamic image generating device and generating method, so as to solve the problem that the image sensor with large pixel and high transfer frequency in the prior art requires a drum with a higher rotational speed. The problem that the drum does not provide the corresponding dynamic target above the drum rating.

In order to solve the above problems, the present invention provides a dynamic transfer function dynamic image generation device, which includes:

Control the acquisition system, control the acquisition system to receive the required image moving speed v input by the user, obtain the imaging focal length f of the imaging component, and calculate the angular velocity w required for the rotation of the mirror according to formula (1);

The turntable is provided with a rotatable mirror. The turntable is used to receive the angular velocity w and drive the mirror to rotate according to the angular velocity w, so that the parallel beam reflected by the rotating mirror forms a dynamic projection image to meet the dynamic requirements of the TDI image sensor to be tested. Test requirements for transfer functions.

As a further improvement of the present invention, the dynamic transfer function dynamic image generating device also includes:

The parallel light source is used to emit parallel light beams, which are incident on the reflector and reflected by the reflector;

The imaging component is arranged on the reflected light path of the mirror, and the parallel beam reflected by the mirror is focused on the target surface of the TDI image sensor to be measured through the imaging component to form a dynamic projection image;

The TDI image sensor to be tested is connected to the control acquisition system, the TDI image sensor to be tested senses the dynamic projection image, and generates a sensing signal, and the control acquisition system obtains the gray value of the dynamic projected image according to the sensing signal, and calculates it according to the gray value. Dynamic transfer function value of the TDI image sensor under test.

In order to solve the above problems, the present invention also provides a method for generating a dynamic image of a dynamic transfer function, which includes the following steps:

Control the acquisition system to receive the required image movement speed v input by the user, obtain the imaging focal length f of the imaging component, and calculate the angular velocity w required for the rotation of the mirror according to formula (1);

The turntable receives the angular velocity w, and drives the mirror to rotate according to the angular velocity w, so that the parallel beam reflected by the rotating mirror forms a dynamic projection image to meet the test requirements of the dynamic transfer function of the TDI image sensor to be tested.

As a further improvement of the present invention, the rotating reflection assembly receives the test rotation speed, and drives the rotation stage of the rotation reflection assembly to rotate according to the test rotation speed, and then further includes:

The parallel light source emits a parallel beam, which is incident on the reflector and reflected by the reflector;

The parallel beam reflected by the mirror is focused on the target surface of the TDI image sensor to be measured by the imaging component to form a dynamic projection image;

The TDI image sensor to be tested senses the dynamic projection image and generates a sensing signal. The control acquisition system obtains the gray value of the dynamic projected image according to the sensing signal, and calculates the dynamic transfer function value of the TDI image sensor to be tested according to the gray value.

Compared with the prior art, the present invention obtains the required image moving speed input by the user, and calculates the required angular speed of the mirror according to the image moving speed and the imaging focal length of the imaging component, and drives the mirror through the turntable at this angular speed. Rotate, so that the reflected light path is projected to the target surface of the image sensor through the imaging optical system, and the dynamic image of the moving speed required by the user is generated to complete the dynamic transfer function test of the image sensor. The focal length of the imaging system is related. The higher the rotational speed and the longer the focal length, the faster the target image moves. Usually, the focal length of the imaging system is greater than 20mm, and the target image can be moved at high speed with only a certain rotation speed.

Description of drawings

FIG. 1 is a schematic structural diagram of the first embodiment of the dynamic transfer function dynamic image generation device of the present invention;

FIG. 2 is a schematic diagram of the imaging principle of the first embodiment of the dynamic transfer function dynamic image generation device of the present invention;

3 is a schematic structural diagram of a second embodiment of the dynamic transfer function dynamic image generating device of the present invention;

4 is a schematic flowchart of the first embodiment of a method for generating a dynamic image of a dynamic transfer function of the present invention;

FIG. 5 is a schematic flowchart of a second embodiment of a method for generating a dynamic image of a dynamic transfer function according to the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

FIG. 1 and FIG. 2 show an embodiment of a dynamic transfer function dynamic image generating device of the present invention, referring to FIG. 1 , in this embodiment, the dynamic transfer function dynamic image generating device includes a control acquisition system 1 and a turntable 2, Wherein, the control acquisition system 1 is used to receive the required image moving speed v input by the user, obtain the imaging focal length f of the imaging component, and calculate the angular velocity w required for the rotation of the mirror 21 according to formula (1);

A rotatable mirror 21 is provided on the turntable 2, and the turntable 2 is used to receive the angular velocity w, and drive the mirror 21 to rotate according to the angular velocity w, so that the parallel beam reflected by the rotating mirror 21 forms a dynamic projection image to satisfy the TDI to be measured. Testing requirements for the dynamic transfer function of image sensors.

由于在成像过程中，间隔预设时间段t的平行光扫过成像组件的夹角θ很小，所以靶标图像的移动速度近似等于

并由该公式得出

将

代入

中即可得到上述的公式(1)。Referring to FIG. 2 , specifically, when two parallel beams of light at an interval of a preset time period t are incident on the imaging assembly, the included angle between the two beams of parallel light is θ, and the moving distance of the target image within the interval preset time period t is The product of the focal length and the tangent of the included angle, that is, l=f·tanθ, the moving speed of the image is

During the imaging process, the included angle θ of the parallel light at intervals of the preset time period t sweeping through the imaging component is very small, so the moving speed of the target image is approximately equal to

and derived from this formula

Will

substitute

The above formula (1) can be obtained.

The invention obtains the required image moving speed input by the user, and calculates the required angular speed of the mirror according to the image moving speed and the imaging focal length of the imaging component, and drives the mirror to rotate at the angular speed through the turntable, so that the reflected light path By projecting the imaging optical system to the target surface of the image sensor, a dynamic image of the moving speed required by the user is generated to complete the dynamic transfer function test of the image sensor, and the moving speed of the target image is related to the rotation speed of the high-precision turntable and the focal length of the imaging system. The higher and the longer the focal length, the faster the target image moves. Usually, the focal length of the imaging system is greater than 20mm, and the target image can be moved at high speed with only a certain rotation speed.

In order to obtain the dynamic transfer function value of the TDI image sensor to be tested, on the basis of the above embodiment, referring to FIG. 3 , in this embodiment, the dynamic transfer function dynamic image generating device further includes a parallel light source 3 , an imaging component 4 and a The TDI image sensor 5 is measured, wherein the parallel light source 3 is used to emit parallel light beams, which are incident on the reflector 21 and reflected by the reflector 21; the imaging component 4 is arranged on the reflected light path of the reflector 21, and the reflector 21 reflects The rear parallel beam is focused on the target surface of the TDI image sensor 5 to be tested by the imaging component 4 to form a dynamic projection image; the TDI image sensor 5 to be tested is connected to the control acquisition system 1, and the TDI image sensor 5 to be tested senses the dynamic projection image, The sensing signal is generated, and the acquisition system 1 is controlled to obtain the gray value of the dynamic projection image according to the sensing signal, and calculates the dynamic transfer function value of the TDI image sensor 5 to be tested according to the gray value.

Specifically, when the control acquisition system 1 controls the turntable 2 to rotate at a constant speed, the parallel light source 3 emits parallel light through the reflector 21 , and is incident on the reflector 21 and reflected by the reflector 21 ; the imaging component 4 is arranged on the reflector 21 On the reflected light path, the parallel beam reflected by the mirror 21 is focused on the target surface of the TDI image sensor 5 to be measured through the imaging component 4 to form a dynamic projection image.

In this embodiment, the parallel light is reflected by the rotating mirror 21, so that the reflected parallel light is in the motion state of rotating scanning, and the parallel light in motion scans the imaging component 4, and is focused to the TDI image to be measured by the imaging component 4 On the target surface of the sensor 5, a dynamic projection image is formed; the TDI image sensor 5 to be tested is connected to the control acquisition system 1, the TDI image sensor 5 to be tested senses the dynamic projection image, and generates a sensing signal, and the control acquisition system 1 obtains the dynamic image according to the sensing signal. The gray value of the projected image is calculated, and the dynamic transfer function value of the TDI image sensor 5 to be tested is calculated according to the gray value. Compared with the rotating drum, the mirror 21 only needs a certain rotation speed to achieve high-speed movement of the target image.

FIG. 4 shows an embodiment of a method for generating a dynamic image of a dynamic transfer function of the present invention. Referring to FIG. 4 , in this embodiment, the generating method includes the following steps:

Step S1, control the acquisition system to receive the required image movement speed v input by the user, obtain the imaging focal length f of the imaging component, and calculate the angular velocity w required for the rotation of the mirror according to formula (1);

Step S2, the turntable receives the angular velocity w, and drives the mirror to rotate according to the angular velocity w, so that the parallel beam reflected by the rotating mirror forms a dynamic projection image to meet the test requirements of the dynamic transfer function of the TDI image sensor to be tested.

In this embodiment, the optical path in the optical system is turned at high speed, and the imaging optical system is projected to the target surface position of the image sensor to generate a dynamic target, so as to realize the dynamic transfer function test of the image sensor. The focal length of the imaging system is related. The higher the rotational speed and the longer the focal length, the faster the target image moves. Usually, the focal length of the imaging system is greater than 20mm, and the target image can be moved at high speed with only a certain rotation speed.

On the basis of the above embodiment, referring to FIG. 5 , in this embodiment, after step S2, it further includes:

Step S21, the parallel light source emits a parallel light beam, which is incident on the reflector and reflected by the reflector;

Step S22, the parallel light beam reflected by the mirror is focused on the target surface of the TDI image sensor to be measured through the imaging component to form a dynamic projection image;

Step S23, the TDI image sensor to be tested senses the dynamic projection image, generates a sensing signal, and controls the acquisition system to obtain the gray value of the dynamic projected image according to the sensing signal, and calculates the dynamic transfer function value of the TDI image sensor to be tested according to the gray value. .

In this embodiment, the parallel light is reflected by the rotating mirror, so that the reflected parallel light is in the motion state of rotating scanning, and the parallel light in motion scans the imaging component, and is focused to the target of the TDI image sensor to be measured through the imaging component On the surface, a dynamic projection image is formed; the TDI image sensor to be tested is connected to the control acquisition system, the TDI image sensor to be tested senses the dynamic projection image, and generates an induction signal, and 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 tested is calculated according to the gray value. Compared with the rotating drum, the mirror only needs a certain rotation speed to achieve high-speed movement of the target image.

It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts among the various embodiments, refer to each other Can. As for the extended content of the method embodiment in this specification, since it is similar to the extended content of the device embodiment, it will not be repeated here, and for related details, please refer to the partial description of the extended content of the device embodiment.

The specific embodiments of the invention have been described in detail above, but they are only used as examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modification or substitution of the invention is also within the scope of the present invention. Therefore, equivalent changes, modifications and improvements made without departing from the spirit and principle scope of the present invention etc., should be included in the scope of the present invention.

Claims (4)

1. a dynamic transfer function dynamic image generation device, is characterized in that, it comprises: Controlling the acquisition system, the control acquisition system is used to receive the required image moving speed v input by the user, obtain the imaging focal length f of the imaging component, and calculate the angular velocity w required for the rotation of the mirror according to formula (1);

A turntable with a rotatable mirror on it, the turntable is used to receive the angular velocity w, and drive the mirror to rotate according to the angular velocity w, so that the parallel beam reflected by the rotating mirror forms a dynamic projection The image meets the testing requirements of the dynamic transfer function of the TDI image sensor to be tested. 2. The dynamic transfer function dynamic image generating device according to claim 1, characterized in that, it further comprises: a parallel light source for emitting parallel light beams, incident on the reflector, and reflected by the reflector; an imaging component, which is arranged on the reflected light path of the mirror, and the parallel beam reflected by the mirror is focused on the target surface of the TDI image sensor to be measured through the imaging component to form the dynamic projection image; The TDI image sensor to be tested is connected to the control acquisition system, the TDI image sensor to be tested senses the dynamic projection image, and generates a sensing signal, and the control acquisition system obtains the dynamic projection image according to the sensing signal The gray value of the projected image is calculated, and the dynamic transfer function value of the TDI image sensor to be tested is obtained by calculating the gray value. 3. a dynamic transfer function dynamic image generation method, is characterized in that, it comprises the steps: Control the acquisition system to receive the required image movement speed v input by the user, obtain the imaging focal length f of the imaging component, and calculate the angular velocity w required for the rotation of the mirror according to formula (1);

The turntable receives the angular velocity w, and drives the mirror to rotate according to the angular velocity w, so that the parallel beam reflected by the rotating mirror forms a dynamic projection image to meet the test requirements of the dynamic transfer function of the TDI image sensor to be tested. 4 . The method for generating a dynamic image of a dynamic transfer function according to claim 3 , wherein the rotating reflection assembly receives the test rotational speed, and drives the rotary table of the rotating reflection assembly to rotate according to the test rotational speed. 5 . , and after that, also include: The parallel light source emits a parallel light beam, which is incident on the reflector and reflected by the reflector; The parallel light beam reflected by the mirror is focused on the target surface of the TDI image sensor to be measured through the imaging component to form the dynamic projection image; The TDI image sensor to be tested senses the dynamic projection image and generates a sensing signal. The control and acquisition system obtains the gray value of the dynamic projected image according to the sensing signal, and calculates the gray value according to the gray value. Describe the dynamic transfer function value of the TDI image sensor to be tested.

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