CN110826248B - Method and system for simulating infrared camera dark angle based on light source database - Google Patents
Method and system for simulating infrared camera dark angle based on light source database Download PDFInfo
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Abstract
The application discloses a method and a system for simulating an infrared camera dark angle based on a light source database, wherein the method comprises the following steps: obtaining a light source model consistent with the emission angle of the infrared light source to be simulated in a light source database; setting the radiation power and wavelength of the light source model; establishing an object plane according to a lens field angle corresponding to the infrared light source to be simulated, and obtaining the diameter of the object plane; adding the built light source model into a structural member for simulation; and comparing irradiance distribution, light intensity distribution or space brightness obtained by simulation, and obtaining a dark angle risk result. Compared with the prior art, the method establishes the infrared light source model to simulate the light path and irradiance, and inputs the power parameters and the wavelength range of the infrared light source, which can be the same as the actual infrared light source emission effect.
Description
Technical Field
The application relates to the field of optical simulation, in particular to a dark angle light path simulation method and system of an infrared camera under the night vision condition.
Background
The traditional simulation method is a straight line simulation method, and when the structure is designed, two straight lines consistent with the emission angle are drawn on the infrared light source according to the emission angle of the infrared light source to replace marginal rays, and whether a dark angle exists is judged by whether the straight lines are blocked by a structural member or not. However, the conventional simulation method cannot simulate the irradiance distribution after being blocked, cannot visually represent the severity of the blocking, and needs to be actually confirmed through a sample. In addition, the traditional simulation method cannot simulate the relative brightness of the center and the edge, the irradiance of the infrared light center is too high, the irradiance of the edge is too low, and dark corners can appear even if light is blocked in a non-structure mode.
Disclosure of Invention
According to one aspect of the application, there is provided a method for simulating an infrared camera vignetting based on a light source database, comprising: obtaining a light source model consistent with the emission angle of the infrared light source to be simulated in a light source database; setting the radiation power and wavelength of the light source model; establishing an object plane according to a lens field angle corresponding to the infrared light source to be simulated, and obtaining the diameter of the object plane; adding the built light source model into a structural member for simulation; and comparing irradiance distribution, light intensity distribution or space brightness obtained by simulation, and obtaining a dark angle risk result.
Optionally, the light source database is a light tools light source database.
Optionally, the radiation power is 160mw and the wavelength is 850nm.
Optionally, the object plane diameter D is calculated according to d=2 Ltan (θ/2), where L is a shooting distance and θ is a lens field angle.
Optionally, when the vignetting risk result is derived from the irradiance distribution, there is a vignetting risk when the irradiance is 0 in the object plane, or the center irradiance is above the first threshold relative to the edge irradiance.
According to another aspect of the present application, there is provided a system for simulating an infrared camera vignetting based on a light source database, comprising: the infrared light source model building module is used for obtaining a light source model consistent with the emission angle of the infrared light source to be simulated in the light source database; the parameter setting module is used for setting the radiation power and the wavelength of the light source model; the calculation module is used for establishing an object plane according to the lens field angle corresponding to the infrared light source to be simulated and obtaining the diameter of the object plane; the simulation module is used for adding the built light source model into a structural member for simulation; and the result obtaining module is used for comparing irradiance distribution, light intensity distribution or space brightness obtained by simulation and obtaining a dark angle risk result.
Optionally, when the vignetting risk result is derived from the irradiance distribution, the result obtaining module obtains the vignetting risk result when the irradiance is 0 in the object plane or the center irradiance is higher than the first threshold with respect to the edge irradiance.
According to another aspect of the application, a computer device is also disclosed, comprising a memory, a processor and a computer program stored in the memory and executable by the processor, the processor implementing the method of any of the above when executing the computer program.
According to another aspect of the present application, a computer readable storage medium, a non-volatile readable storage medium, having stored therein a computer program which, when executed by a processor, implements the method of any of the above.
According to another aspect of the application, a computer program product is also disclosed, comprising computer readable code which, when executed by a computer device, causes the computer device to perform the method of any of the preceding claims.
Compared with the prior art, the application has the following advantages:
and establishing an infrared light source model to simulate the light path and irradiance, and inputting the power parameters and the wavelength range of the infrared light source, wherein the power parameters and the wavelength range can be the same as the actual infrared light source emission effect.
Not only can the hidden angle risk caused by light blocking of the structural member be simulated, but also the hidden angle risk caused by the larger difference of the relative irradiance between the center and the edge can be simulated.
The infrared light is usually measured by an irradiance meter, and the infrared light is the same as the unit of application theoretical simulation, is convenient to calibrate with the actual, and can improve the theoretical simulation precision.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this specification. The drawings and their description are illustrative of the application and are not to be construed as unduly limiting the application. In the drawings:
FIG. 1 is a flow chart of a method for simulating an infrared camera vignetting based on a light source database according to one embodiment of the application;
FIG. 2 is a graph of irradiance distribution according to one embodiment of the application;
FIG. 3 is a schematic diagram of a computer device according to one embodiment of the application; and
FIG. 4 is a schematic diagram of a computer-readable storage medium according to one embodiment of the application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
Referring to figure 1 of the drawings in which, the embodiment of the application provides a method for simulating the dark angle of an infrared camera based on a light source database, which comprises the following steps:
s2: obtaining a light source model consistent with the emission angle of the infrared light source to be simulated in a light source database;
s4: setting the radiation power and wavelength of the light source model;
s6: establishing an object plane according to a lens field angle corresponding to the infrared light source to be simulated, and obtaining the diameter of the object plane;
s8: adding the built light source model into a structural member for simulation; a kind of electronic device with high-pressure air-conditioning system
S10: and comparing irradiance distribution, light intensity distribution or space brightness obtained by simulation, and obtaining a dark angle risk result.
In the present embodiment, the light source models with consistent emission angles are found in the light tools light source database, but not limited to this, and those skilled in the art can use the light source models in other databases, such as zemax, code V, com sol, etc., according to actual requirements, which are all within the scope of the present application. The light tools light source database is described below as an example. In this embodiment, an infrared light source model with an emission angle of 120 ° is selected. In this embodiment, the radiation power is set to 160mw and the center wavelength is set to 850nm. But is not limited thereto. Then, an object plane is established according to the lens angle of view, and the object plane diameter is calculated. The built light source model is then simulated, for example, the open angles of the structural members are 90 degrees and 120 degrees respectively. And finally, obtaining a distribution diagram, and obtaining whether the dark angle risk exists or not according to the distribution diagram.
In an embodiment of the present application, the method for calculating the diameter of the object plane is as follows: the diameter D of the object plane is calculated according to the formula d=2 Ltan (θ/2). For example, the lens angle θ is 120 °, the shooting distance L is 80cm, and the diameter calculated according to the above formula is 2771mm.
The profile may be an irradiance profile, a light intensity profile, or a spatial luminance profile, in one embodiment of the application the profile is an irradiance profile. Referring to fig. 2, when the distribution map is an irradiance distribution, if the irradiance is 0 in the object plane, or the center irradiance is higher than the edge irradiance (i.e., higher than a threshold), i.e., the irradiance distribution curve slope is too large, then there is a dark angle risk. For example, irradiance at 1110mm of the object plane of the 90-degree light source is 0, a dark angle exists, irradiance of 120 degrees is larger than 0 in the whole object plane, irradiance curves are consistent with those of the 120-degree light source, center relative irradiance is not too high, and therefore dark angle risk is judged. But is not limited thereto.
The application also provides a system for simulating the dark angle of the infrared camera based on the light source database, which comprises:
the infrared light source model building module is used for obtaining a light source model consistent with the emission angle of the infrared light source to be simulated in the light source database;
the parameter setting module is used for setting the radiation power and the wavelength of the light source model;
the calculation module is used for establishing an object plane according to the lens field angle corresponding to the infrared light source to be simulated and obtaining the diameter of the object plane;
the simulation module is used for adding the built light source model into a structural member for simulation; a kind of electronic device with high-pressure air-conditioning system
And the result obtaining module is used for comparing irradiance distribution, light intensity distribution or space brightness obtained by simulation and obtaining a dark angle risk result.
In an embodiment of the present application, when the vignetting risk result is obtained by irradiance distribution, the result obtaining module obtains the vignetting risk result when irradiance is 0 in the object plane or the center irradiance is higher than the first threshold value with respect to the edge irradiance.
Referring to fig. 3, the present application further provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable by the processor, where the processor implements the method of any one of the above when executing the computer program.
Referring to fig. 4, a computer readable storage medium, a non-volatile readable storage medium, has stored therein a computer program which, when executed by a processor, implements the method of any of the above.
A computer program product comprising computer readable code which, when executed by a computer device, causes the computer device to perform the method of any of the preceding claims.
Compared with the prior art, the application has the following advantages:
and establishing an infrared light source model to simulate the light path and irradiance, and inputting the power parameters and the wavelength range of the infrared light source, wherein the power parameters and the wavelength range can be the same as the actual infrared light source emission effect.
Not only can the hidden angle risk caused by light blocking of the structural member be simulated, but also the hidden angle risk caused by the larger difference of the relative irradiance between the center and the edge can be simulated.
The infrared light is usually measured by an irradiance meter, and the infrared light is the same as the unit of application theoretical simulation, is convenient to calibrate with the actual, and can improve the theoretical simulation precision.
It will be apparent to those skilled in the art that the modules or steps of the application described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, or they may alternatively be implemented in program code executable by computing devices, such that they may be stored in a memory device for execution by the computing devices, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps within them may be fabricated into a single integrated circuit module. Thus, the present application is not limited to any specific combination of hardware and software.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (6)
1. The method for simulating the dark angle of the infrared camera based on the light source database is characterized by comprising the following steps of:
obtaining a light source model consistent with the emission angle of the infrared light source to be simulated in a light source database;
setting the radiation power and wavelength of the light source model;
establishing an object plane according to a lens field angle corresponding to the infrared light source to be simulated, obtaining an object plane diameter, and calculating the object plane diameter D according to D=2Ltan (theta/2), wherein L is a shooting distance, and theta is the lens field angle;
adding the built light source model into a structural member for simulation; a kind of electronic device with high-pressure air-conditioning system
Comparing irradiance distribution obtained by simulation and obtaining a dark angle risk result;
when the vignetting risk result is derived from the irradiance distribution, there is a vignetting risk when the center irradiance versus the edge irradiance is above a first threshold in the object plane.
2. The method for simulating infrared camera vignetting based on a light source database of claim 1, wherein the light source database is a light tools light source database.
3. The method for simulating infrared camera vignetting based on a light source database of claim 1, wherein the radiation power is 160mw and the wavelength is 850nm.
4. A system for simulating an infrared camera vignetting based on a light source database, comprising:
the infrared light source model building module is used for obtaining a light source model consistent with the emission angle of the infrared light source to be simulated in the light source database;
the parameter setting module is used for setting the radiation power and the wavelength of the light source model;
the calculation module is used for establishing an object plane according to a lens field angle corresponding to the infrared light source to be simulated, obtaining an object plane diameter, and calculating the object plane diameter D according to D=2Ltan (theta/2), wherein L is a shooting distance, and theta is the lens field angle;
the simulation module is used for adding the built light source model into a structural member for simulation; a kind of electronic device with high-pressure air-conditioning system
The result obtaining module is used for comparing irradiance distribution obtained by simulation and obtaining a dark angle risk result; when the vignetting risk result is derived from the irradiance distribution, the result obtaining module obtains a vignetting risk result when the center irradiance is above a first threshold relative to the edge irradiance in the object plane.
5. A computer device comprising a memory, a processor and a computer program stored in the memory and executable by the processor, wherein the processor implements the method of any of claims 1-3 when executing the computer program.
6. A computer readable storage medium, in which a computer program is stored which, when executed by a processor, implements the method according to any of claims 1-3.
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| CN111912784B (en) * | 2020-04-15 | 2023-10-20 | 杭州涂鸦信息技术有限公司 | Method and system for detecting infrared reflection stray light |
| CN111586266B (en) * | 2020-04-29 | 2021-09-21 | 杭州涂鸦信息技术有限公司 | Method for selecting infrared light source in infrared camera based on optical simulation software |
| CN111985116A (en) * | 2020-08-31 | 2020-11-24 | 杭州涂鸦信息技术有限公司 | Lens interference detection method and system based on optical simulation software and related equipment |
| CN113532800A (en) * | 2021-05-21 | 2021-10-22 | 杭州涂鸦信息技术有限公司 | Analysis method of light-transmitting area and related equipment and device |
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