- The advantages, disadvantages, and application scenarios of white light, blue light, and laser light
projector respectively are? - Some objects absorb light based on their color? How should this be understood?
- Does the color of the light have an impact on the quality of the point cloud?
Answer 1
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DLP Projector with White Light:
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Main features: High-intensity energy, suitable for long-distance and high-speed scenarios, usually used in combination with a color monocular camera, no need for an additional color camera configuration.
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Suitable scenarios: Works of any color can reflect corresponding band light.
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DLP Projector with Blue Light:
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Main features: Shorter wavelength, stronger scattering ability, blue light is more sensitive to surface microstructures. For example, it is suitable for inspecting areas with less obvious contrast, such as observing metal surfaces.
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Suitable scenarios: Under blue light, white, purple, and blue surfaces appear brighter and effectively reflect blue light. The contrast in the camera’s structured light capture will be higher.
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Laser Projector:
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Main features: Compared to regular light sources, lasers have better monochromaticity and directionality, with higher brightness.
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Suitable scenarios: Perform well in environments with strong ambient light.
Answer 2
- When we see an object as a certain color, it’s because the object absorbs all other colors of light and only reflects the light of the color we perceive.
- In other words, an object appears blue because it absorbs all other colors of light (e.g., green and red) and only reflects blue light.
- Similarly, a white object appears white because it reflects all colors of light, and a black object appears black because it absorbs all colors of light. That’s why some objects absorb light based on their color.
Answer 3
- The color of the light source may have a slight impact on the quality of the 3D camera’s point cloud, but it is usually not very significant.
- Firstly, it’s important to clarify that the color of the light source refers to the color of the light emitted by the source.
- When using a 3D camera for scanning, the quality and direction of the light source may have minor effects on the results. Specifically, if there are significant differences in the color of the light source, it may lead to similar surface parts reconstruction due to the reflection or absorption of different colors of light by certain materials or surfaces. Similarly, if the direction of the light is unstable, it may result in noise and other deviations in the point cloud.
- In summary, while the color of the light source may have a slight impact on the quality of the 3D camera’s point cloud, its effects are generally not very pronounced.