Indoor small-phase-angle dark target visible light scattering characteristic measurement and evaluation method
By setting up a low-reflection mirror extinction device on the background wall, the problem of the gray value lower than the background in the measurement and evaluation of the visible light scattering characteristics of the indoor small phase angle dark target is solved, and quantitative processing and measurement evaluation are realized, which has important application potential.
Patent Information
- Application Number
- CN202411703493.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-03-04
AI Technical Summary
In the evaluation of indoor dark target visible light scattering characteristics, data processing at small phase angles is difficult. The sun simulator illumination causes light spots on the background wall. The gray value of the dark target in the camera is lower than that of the background wall, and quantitative processing cannot be performed.
A low-reflection mirror extinction device is set up on the background wall, and a sun simulator is used to emit visible light to illuminate the dark target. The detection camera is placed in a small phase angle observation area, and the dark target is shot to obtain a grayscale image.
By reducing the proportion of energy reflected back to the camera in the background wall, the gray value of the dark target is higher than that of the background wall, quantitative processing and measurement evaluation of the visible light scattering characteristic data of the dark target are achieved in a small phase angle.
Smart Images
Figure CN119555641A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of dark target testing, and in particular to a method for measuring and evaluating visible light scattering characteristics of indoor small phase angle dark targets. Background Art
[0002] In the current measurement and evaluation of the visible light scattering characteristics of indoor dark targets, the following problems exist in data processing at small phase angles: the solar simulator system will illuminate the background wall behind, causing a light spot to appear on the background wall. Under the field of view with a small phase angle, the target will be in the background light spot, and the grayscale value corresponding to the dark target (the material used usually has a reflectivity of less than 1%) in the camera will be lower than the sunlight on the background wall, resulting in the inability to quantitatively process the image of the dark target and the inability to provide the visible light scattering characteristics data at this angle, which limits the measurement and evaluation of the visible light scattering characteristics of dark targets with small phase angles. Summary of the invention
[0003] The embodiment of the present invention provides a method for measuring and evaluating the visible light scattering characteristics of an indoor dark target with a small phase angle, which can realize the measurement and evaluation of the visible light scattering characteristics of a dark target with a small phase angle.
[0004] The embodiment of the present invention provides a method for measuring and evaluating the visible light scattering characteristics of an indoor small phase angle dark target, which is characterized by comprising:
[0005] Use a solar simulator to emit visible light to illuminate a dark target;
[0006] Set up a light-extinguishing device on the background wall;
[0007] The detection camera is placed in the small phase angle observation area to shoot the dark target and obtain a grayscale image.
[0008] In a possible design, the step of providing a light-extinguishing device on the background wall includes:
[0009] A low-reflection mirror extinction device is arranged on the background wall; wherein the angle between the low-reflection mirror extinction device and the incident light path is not 90°.
[0010] In a possible design, after placing the detection camera in the small phase angle observation area, the following is further included:
[0011] The grayscale image of the dark target under the condition of small phase angle observation is quantitatively processed, and the measurement and evaluation results of the visible light scattering characteristics of the dark target are given.
[0012] Compared with the prior art, the present invention has at least the following beneficial effects:
[0013] The technology disclosed in the present invention can greatly reduce the proportion of energy irradiated on the background wall and returned to the camera field of view under small phase angle observation conditions by adding a coating with low reflectivity in the background wall area, so that the grayscale value corresponding to the target under small phase angle observation conditions is higher than the grayscale value corresponding to the sunlight on the background wall, so that the visible light scattering characteristic data at this angle can be quantitatively processed, and the measurement and evaluation of the visible light scattering characteristics of dark targets with small phase angles can be realized, which has important application potential in the field of measurement and evaluation of visible light scattering characteristics of dark targets indoors. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0015] Figure 1 It is a structural schematic diagram of a system for measuring and evaluating the visible light scattering characteristics of an indoor small phase angle dark target provided by an embodiment of the present invention.
[0016] In the figure:
[0017] 1-background wall; 2-extinction device; 3-turntable; 4-dark target; 5-camera; 6-solar simulator. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0019] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0020] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present invention are described at the angles shown in the drawings and should not be understood as limiting the embodiments of the present invention. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.
[0021] like Figure 1 As shown, an embodiment of the present invention provides a method for measuring and evaluating the visible light scattering characteristics of an indoor small phase angle dark target, which is characterized by comprising:
[0022] Use a solar simulator to emit visible light to illuminate a dark target;
[0023] Set up a light-extinguishing device on the background wall;
[0024] The detection camera is placed in the small phase angle observation area to shoot the dark target and obtain a grayscale image.
[0025] The technology disclosed in the present invention can greatly reduce the proportion of energy irradiated on the background wall and returned to the camera field of view under small phase angle observation conditions by adding a low reflectivity extinction device to the background wall area, so that the gray value corresponding to the target under small phase angle observation conditions is higher than the gray value corresponding to the sunlight on the background wall, so that the visible light scattering characteristic data at this angle can be quantitatively processed, and the measurement and evaluation of the visible light scattering characteristics of dark targets with small phase angles can be realized, which has important application potential in the field of measurement and evaluation of visible light scattering characteristics of dark targets indoors. Specifically, the light source of the dark target is irradiated onto the background wall, and most of the energy is absorbed by the extinction device.
[0026] It should be noted that the dark target is set on a turntable.
[0027] In some embodiments of the present invention, the step of providing a light-extinguishing device on the background wall includes:
[0028] A low-reflection mirror extinction device is arranged on the background wall; wherein the angle between the low-reflection mirror extinction device and the incident light path is not 90°.
[0029] In this embodiment, although the extinction device can absorb visible light, some visible light will still be reflected back to the incident light path, affecting the test results. Therefore, the extinction device is set to a mirror. The material has an absorption function and the mirror has a reflection function. The unabsorbed visible light is reflected through the mirror, so that most of the unabsorbed energy will not return from the original light path.
[0030] Preferably, the matting means is a mirror coating.
[0031] In some embodiments of the present invention, after placing the detection camera in the small phase angle observation area, the method further includes:
[0032] The grayscale image of the dark target under the condition of small phase angle observation is quantitatively processed, and the measurement and evaluation results of the visible light scattering characteristics of the dark target are given.
[0033] In the image captured by the camera, the grayscale value of the dark target area is higher than the background. The resulting calibration curve is used to quantitatively process the visible light scattering characteristics of the dark target, obtain the visible light scattering characteristics data, and give the measurement and evaluation results of the visible light scattering characteristics of the dark target with a small phase angle.
[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for measuring and evaluating the visible light scattering characteristics of indoor small phase angle dark targets, characterized in that: include: Use a solar simulator to emit visible light to illuminate a dark target; Set up a light-extinguishing device on the background wall; The detection camera is placed in the small phase angle observation area to shoot the dark target and obtain a grayscale image.
2. The method according to claim 1, characterized in that The step of arranging a light-extinguishing device on the background wall comprises: A low-reflection mirror extinction device is arranged on the background wall; wherein the angle between the low-reflection mirror extinction device and the incident light path is not 90°.
3. The method according to claim 1, characterized in that After placing the detection camera in the small phase angle observation area, it also includes: The grayscale image of the dark target under the condition of small phase angle observation is quantitatively processed, and the measurement and evaluation results of the visible light scattering characteristics of the dark target are given.