CN111122126A - Optical system definition testing method and device - Google Patents
Optical system definition testing method and device Download PDFInfo
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- CN111122126A CN111122126A CN201911412789.0A CN201911412789A CN111122126A CN 111122126 A CN111122126 A CN 111122126A CN 201911412789 A CN201911412789 A CN 201911412789A CN 111122126 A CN111122126 A CN 111122126A
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Abstract
The invention discloses a device for testing the definition of an optical system, which comprises an optical power controller, a light splitting structure, an energy detector, a controller, an acquisition system and a processor, wherein the optical power controller is used for outputting a light beam input by the optical system to the light splitting structure and controlling the light intensity of the light beam output to the light splitting structure; a light splitting structure for splitting an input light beam into a first light beam and a second light beam; an energy detector for detecting the light intensity of the first light beam; the controller is used for controlling the light intensity of the light beam output by the light power controller according to the light intensity of the first light beam detected by the energy detector; an acquisition system for converting the second beam into an electronic image; and a processor for determining the sharpness of the optical system based on the sharpness evaluation function and the electronic image. The invention has better application range and higher accuracy and reliability of the test result.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a method and a device for testing the definition of an optical system.
Background
Among evaluation indexes of imaging quality of the optical imaging device, optical clarity of an imaging result is one of important indexes, and therefore, testing of the optical clarity is an indispensable step for evaluating the optical device.
In the prior art, the definition of imaging of the optical equipment can be evaluated by adopting a definition evaluation function, the imaging result of the optical system is calculated by various definition evaluation functions, and the corresponding definition value is calculated. The method has the main advantages of simple system and small operand.
For the method for testing the definition of the optical system by various definition evaluation functions, the core image processing algorithm is greatly influenced by the brightness of the collected image, namely, the definition test result is very sensitive to the light intensity passing through the optical system to be tested, so that even if the same image source is adopted for the same optical system, the difference of the test result is large due to the different brightness of the collected image. This difference does not accurately reflect the degree of clarity of the system under test, and is inconsistent with objective conditions.
Disclosure of Invention
The embodiment of the invention provides a method and a device for testing the definition of an optical system. The method aims to solve the problem of inaccurate optical definition test in the prior art. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of embodiments of the present invention, there is provided an optical system sharpness testing apparatus, comprising an optical power controller, a light splitting structure, an energy detector, a controller, an acquisition system and a processor, wherein,
the optical power controller is used for outputting the light beam input by the optical system to the light splitting structure and controlling the light intensity of the light beam output to the light splitting structure;
the light splitting structure is used for splitting an input light beam into a first light beam and a second light beam, the first light beam is output to the energy detector, the second light beam is output to the acquisition system, and a preset ratio is formed between the light intensity of the first light beam and the light intensity of the second light beam;
an energy detector for detecting the light intensity of the first light beam;
the controller is used for controlling the light intensity of the light beam output by the light power controller according to the light intensity of the first light beam detected by the energy detector;
an acquisition system for converting the second beam into an electronic image;
and a processor for determining the sharpness of the optical system based on the sharpness evaluation function and the electronic image.
Optionally, the optical power controller comprises crossed polarizers or attenuators.
Optionally, the controller is further configured to control the light intensity of the light beam output by the optical power controller within a preset light intensity range according to the light intensity of the first light beam detected by the energy detector.
Optionally, the acquisition system comprises a lens and a camera, wherein,
the lens is used for imaging the second light beam to the camera;
the camera is used for converting the image formed by the second light beam into an electronic image.
Optionally, the processor is configured to determine the sharpness of the optical system according to the sharpness evaluation function, the electronic image, and the light intensity of the first light beam detected by the energy detector.
According to a second aspect of the embodiments of the present invention, there is provided an optical system sharpness testing method, including:
receiving a light beam output by an optical system;
splitting a light beam output by the optical system into a first light beam and a second light beam, wherein a preset ratio is formed between the light intensity of the first light beam and the light intensity of the second light beam;
acquiring the light intensity of the first light beam;
controlling the light intensity of the light beam output by the optical system according to the light intensity of the first light beam;
converting the second light beam into an electronic image;
and determining the definition of the optical system according to the definition evaluation function and the electronic image.
Optionally, controlling the light intensity of the light beam output by the optical power controller according to the light intensity of the first light beam includes:
and controlling the light intensity of the light beam output by the light power controller within a preset light intensity range according to the light intensity of the first light beam.
Optionally, the sharpness of the optical system is determined from the sharpness evaluation function and the electronic image, including,
and determining the definition of the optical system according to the definition evaluation function, the electronic image and the light intensity of the first light beam.
According to the technical scheme disclosed by the embodiment of the invention, the brightness range of the optical system which can be tested is wider, the application range is better, the test result has higher accuracy and reliability, the definition of different optical systems can be evaluated by the same definition testing device under the condition of not changing parameter configuration, the definition result can be transversely compared, and the practical significance is good.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of an optical system sharpness testing apparatus according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a method for testing the sharpness of an optical system according to an embodiment of the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the structures, products and the like disclosed by the embodiments, the description is relatively simple because the structures, the products and the like correspond to the parts disclosed by the embodiments, and the relevant parts can be just described by referring to the method part.
The embodiment of the invention discloses a device 10 for testing the sharpness of an optical system, which comprises, as shown in fig. 1, an optical power controller 101, a light splitting structure 102, an energy detector 103, a controller 104, an acquisition system 105 and a processor 106, wherein,
an optical power controller 101, configured to output a light beam input by the optical system to the light splitting structure 102, and control a light intensity of the light beam output to the light splitting structure 102;
the light splitting structure 102 is used for splitting an input light beam into a first light beam and a second light beam, the first light beam is output to the energy detector 103, the second light beam is output to the acquisition system 105, and a preset ratio is formed between the light intensity of the first light beam and the light intensity of the second light beam;
an energy detector 103 for detecting the light intensity of the first light beam;
a controller 104 for controlling the light intensity of the light beam output from the optical power controller 101 according to the light intensity of the first light beam detected by the energy detector 103;
an acquisition system 105 for converting the second light beam into an electronic image;
a processor 106 for determining the sharpness of the optical system based on the sharpness evaluation function and the electronic image.
The optical power controller 101 may include various components, and may include crossed polarizers or attenuators, for example. The optical power controller 101 can be used to implement attenuation of the light beam passing through the optical power controller 101, so that when various parameters of the collection system 105 are completely fixed, the adaptability to the intensity of the light beam output by the optical system can be enhanced, that is, when the intensity of the light beam output by the optical system is greatly changed, the light intensity of the light beam passing through the optical power controller 101 and input into the collection system 105 is still maintained at the same or similar intensity level. In addition, the optical power controller 101 should not introduce aberration when attenuating the light beam.
The light splitting structure 102 may be configured to split the light beam passing through the optical power controller 101 into two parts according to a specific preset light intensity ratio, that is, a first light beam and a second light beam, where the first light beam is output to the energy detector 103, and the second light beam is output to the acquisition system 105. Illustratively, the light splitting structure 102 may include a light splitting prism or the like.
The energy detector 103 may receive the first light beam emitted from the light splitting structure 102 and detect the light intensity of the first light beam.
Generally, the collection system 105 has an optimal coupling energy range, and since the light intensity of the first light beam and the light intensity of the second light beam have a fixed ratio, the energy detector 103 also has an optimal receiving energy range, and when the light intensity of the first light beam is not within the optimal receiving energy range, the light power controller 101 can be controlled and modulated by the controller 104, so that the light intensity of the first light beam is within the optimal receiving energy range, that is, the control of the light intensity can be completed.
Furthermore, since the optimal received energy range is a range value, the corresponding definition test result does not completely get rid of the influence caused by energy variation, and therefore after the system calibration, the light intensity of the first light beam detected by the energy detector 103 can be used as a weighting parameter, and the accuracy and reliability of the definition test result are further improved.
The controller 104 may be configured to control the optical power controller 101 by obtaining the light intensity of the first light beam detected by the energy detector 103, so that the light intensity of the light beam output by the optical power controller is within a preset light intensity range, so as to distribute the energy incident to the acquisition system 105 within a calibrated optimal coupling energy range.
Illustratively, the controller 104 may comprise an electronic controller or may comprise a manual controller, which is manually controlled by a user of the testing device 10 by the optical power controller 101 in response to the intensity of the first light beam detected by the energy detector 103.
The combined action of the energy detector 103, the controller 104 and the optical power controller 101 enables the intensity of the coupled light to be strictly controlled, and under the condition of using the same image source, the definition test results of different optical systems can be used for transverse comparison, and the comparison result represents the quality of the definitions of different optical systems.
The capture system 105 may include a lens and a camera, and in particular, the lens may be used to image the second light beam to the camera, and the camera may be used to convert the image of the second light beam into an electronic image.
In general, the acquisition system 105 may convert the optical image into an electronic image and output to the processor 106. Before starting the test, the optimal parameter values of the acquisition system 105, including the optimal coupling energy range, etc., can be determined, and all parameters are kept unchanged during the test process, thereby reducing the uncertainty of the definition test result caused by adjusting the system parameters and improving the accuracy and reliability of the definition test result.
The processor 106, after receiving the electronic image collected by the collection system 105, may determine the sharpness of the optical system according to the sharpness evaluation function.
Illustratively, the sharpness evaluation function may include a gradient function, an absolute variance function, an edge detection function, a gradient vector module function, an autocorrelation function, an entropy function, a full-band integration function, an adjacent gray difference operator absolute value function, a median filter-discrete cosine function, an image energy function, and the like.
Further, as before, the intensity of the first light beam detected by the energy detector 103 may be used as a weighting parameter, and thus the processor 106 may be configured to determine the sharpness of the optical system based on the sharpness evaluation function, the electronic image and the intensity of the first light beam detected by the energy detector 106.
In the prior art, when the light intensity of the light beam output by the optical system changes greatly, which results in that the definition cannot be measured accurately, the methods of controlling the exposure time, controlling the gain coefficient, controlling the f-number, etc. can be generally adopted, but these methods still have the problem of insufficient accuracy, more seriously, the parameter value of the testing device is changed in the testing process, the consistency of the testing device can be damaged, and the reliability of the transverse contrast between different optical systems to be tested is reduced.
The optical system definition testing device disclosed by the embodiment of the invention is characterized in that an optical image is output by an optical system to be tested, the optical image enters a light splitting structure after passing through a light power controller, a light beam is split into two parts, one part enters an energy detector, a detection result is used as calibration data and is input into the controller to control the light power controller to control the light intensity entering the optical system definition testing device, the detection result can also be input into a processor as compensation data to participate in definition result calculation, the other part enters an acquisition system, the acquisition system outputs an electronic image to the processor, and the processor determines the definition of the optical system according to a definition evaluation function.
Compared with the prior art, the technical scheme disclosed by the embodiment of the invention has the advantages that the luminance range of the optical system which can be tested is wider, the application range is better, the test result has higher accuracy and reliability, the definition of different optical systems can be evaluated by the same definition testing device under the condition of not changing parameter configuration, the definition result can be transversely compared, and the practical significance is good.
Based on the optical system definition testing apparatus 10, the embodiment of the present invention further discloses an optical system definition testing method, as shown in fig. 2, including:
s201, receiving a light beam output by an optical system;
s202, splitting a light beam output by the optical system into a first light beam and a second light beam, wherein a preset ratio is formed between the light intensity of the first light beam and the light intensity of the second light beam;
s203, acquiring the light intensity of the first light beam;
s204, controlling the light intensity of the light beam output by the optical system according to the light intensity of the first light beam;
s205, converting the second light beam into an electronic image;
and S206, determining the definition of the optical system according to the definition evaluation function and the electronic image.
Optionally, S204 further includes:
s2041, controlling the light intensity of the light beam output by the light power controller within a preset light intensity range according to the light intensity of the first light beam.
Optionally, S206 may further include:
s2061, determining the definition of the optical system according to the definition evaluation function, the electronic image and the light intensity of the first light beam.
The method for testing the optical system definition disclosed in the embodiment of the present invention may be executed by the apparatus for testing the optical system definition shown in fig. 1, and those skilled in the art may refer to the foregoing description in the specific implementation process, which is not described herein again.
It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. An optical system definition testing device comprises an optical power controller, a light splitting structure, an energy detector, a controller, an acquisition system and a processor, wherein,
the optical power controller is used for outputting the light beam input by the optical system to the light splitting structure and controlling the light intensity of the light beam output to the light splitting structure;
the light splitting structure is used for splitting an input light beam into a first light beam and a second light beam, the first light beam is output to the energy detector, the second light beam is output to the acquisition system, and a preset ratio is formed between the light intensity of the first light beam and the light intensity of the second light beam;
the energy detector is used for detecting the light intensity of the first light beam;
the controller is used for controlling the light intensity of the light beam output by the light power controller according to the light intensity of the first light beam detected by the energy detector;
the acquisition system is used for converting the second light beam into an electronic image;
the processor is used for determining the definition of the optical system according to the definition evaluation function and the electronic image.
2. The test device of claim 1, wherein the optical power controller comprises crossed polarizers or attenuators.
3. The test apparatus of claim 1,
the controller is further used for controlling the light intensity of the light beam output by the light power controller to be within a preset light intensity range according to the light intensity of the first light beam detected by the energy detector.
4. The test device of claim 1, wherein the acquisition system comprises a lens and a camera, wherein,
the lens is used for imaging the second light beam to the camera;
the camera is used for converting an image formed by the second light beam into an electronic image.
5. The test apparatus of claim 1,
the processor is used for determining the definition of the optical system according to the definition evaluation function, the electronic image and the light intensity of the first light beam detected by the energy detector.
6. A method of optical system sharpness testing, comprising:
receiving the light beam output by the optical system;
splitting the light beam output by the optical system into a first light beam and a second light beam, wherein a preset ratio is formed between the light intensity of the first light beam and the light intensity of the second light beam;
acquiring the light intensity of the first light beam;
controlling the light intensity of the light beam output by the optical system according to the light intensity of the first light beam;
converting the second light beam into an electronic image;
determining the sharpness of the optical system based on the sharpness evaluation function and the electronic image.
7. The method of claim 6, wherein controlling the intensity of the light beam output by the optical power controller based on the intensity of the first light beam comprises:
and controlling the light intensity of the light beam output by the light power controller within a preset light intensity range according to the light intensity of the first light beam.
8. The test method of claim 6, wherein determining the sharpness of the optical system from the sharpness evaluation function and the electronic image comprises,
and determining the definition of the optical system according to the definition evaluation function, the electronic image and the light intensity of the first light beam.
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