Reasons and countermeasures for why black rubber and black resin cannot be measured with 3D sensors.
The reason that black rubber and resin cannot be measured by 3D sensors is that their surfaces absorb most of the light that hits them, resulting in insufficient light returning to the camera. The image becomes dark and can be obscured by noise, leading to missing or rough points. The solutions are to increase the returning light, reduce noise, or choose a method to focus the light into a single point. [Key Points] - The cause is that light is absorbed, resulting in insufficient returning light. - Dark images are obscured by sensor noise. - Methods for gathering light and averaging multiple images can be effective. *For detailed explanations, please refer to the technical notes and downloadable materials in the related links.*
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basic information
【Contents of this Technical Note】 ■ The reason black rubber does not appear in 3D is that light is absorbed. ■ Dark images are overwhelmed by sensor noise. ■ The operator increases light, reduces noise, and chooses the method. ■ Whiteout of black rubber and slanted surfaces. ■ Limitations: very dark surfaces and tiny scratches. ■ Common misconceptions about black objects. ■ How to proceed when verifying with the actual object. 【Consultation】 I will confirm whether it can be measured or captured with the actual object. Please consult me with one photo.
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The technical notes can be read by anyone from the related links. We will discuss the costs of development and testing based on the details you provide.
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Applications/Examples of results
【Frequently Asked Questions】 Q. Can I measure it by spraying white spray on black rubber? A. In many cases, it can be measured. However, the thickness of the film will affect the measurements. It is also difficult to spray all items, so it is not a practical method for inspection. Q. Will increasing the camera sensitivity solve the problem? A. Increasing sensitivity will also amplify noise along with the signal. Effective methods include increasing light, extending exposure time, and averaging multiple images. Q. Are there any black resins that are easy to measure? A. Yes, there are. Surfaces that are finely textured tend to scatter light, making them relatively easier to measure. Conversely, glossy black surfaces can be difficult due to the combination of reflection and darkness.
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We specialize in 2D and 3D inspection and measurement technologies using cameras. We possess a wide range of knowledge in optics, mechanics, electronics, and software, enabling us to provide technical support for both hardware and software. Not only do we have personnel with experience working as researchers at image inspection device manufacturers, major electronic component manufacturers, and universities, but we also have numerous successful implementations of developed products in actual production environments, making our ability to adapt advanced technology to on-site needs a strong point. Additionally, we are skilled not only in developing proprietary algorithms but also in using off-the-shelf products such as image processing controllers from Keyence and Omron, allowing us to excel in selecting and utilizing the most suitable equipment for specific needs. In recent years, while AI technology has garnered attention, there are cases where utilizing 2D and 3D technologies can be implemented more easily than AI, and cases where optical devices and mechanical jigs can improve performance and reduce software load. We offer services related to image systems, including "equipment selection," "implementation support," "performance improvement of existing equipment," "technology development," and "joint development," so please feel free to consult with us first.
