How To Eliminate Reflection In Machine Vision Inspection?

Hello, in the field of machine vision, doesn't the reflection problem really drive you crazy? Especially when detecting metal products, reflection is almost a "regular visitor", seriously affecting the final imaging effect. Don't worry. Today will share with you several practical methods to eliminate reflection. Learning these methods might make you shine at work.

Lighting - The Key of Keys

Lighting is of utmost importance in machine vision. It's no exaggeration to say that "a well - lit scene means half the success of a project". To eliminate reflection, lighting is the most direct and effective means.

Low - Angle Lighting: Simple and Practical

In terms of lighting methods, low - angle lighting is a great option. When the illuminating light is parallel to the detection surface, most of the reflected light won't enter the camera, which can significantly reduce the impact of reflection on imaging.

Choose the Right Light Source, and Detection Will Be Worry - Free

Among numerous light sources, the coaxial light is a "powerful assistant" for eliminating reflection. It can make the reflected light on the object surface and the camera be on the same axis. Not only can it clearly highlight the unevenness of the object surface, but it can also effectively overcome the interference of reflection.

Take the character detection on the product surface as an example. By comparing the detection effects of ring lights, dome lights, and coaxial lights, it can be clearly seen that after using the coaxial light, the reflection on the part surface is significantly reduced, the characters are clearly visible, and the detection work becomes much easier.

Optical Accessories to the Rescue

In addition to lighting and choosing the right light source, adding appropriate optical accessories can also eliminate reflection. This amazing accessory is the polarizer. The polarizing lens can change the direction of the polarized light entering the lens, thereby reducing or even eliminating reflection.

Usually, we use the polarizer and the polarizing filter together. By rotating the polarizing filter to find the appropriate polarization angle, the background that was originally bright due to reflection will gradually darken, forming a sharp contrast with the white characters, which greatly facilitates subsequent algorithm judgment.

The above are several common methods to eliminate reflection. You're welcome to share with us via email or WhatsApp if you have other tips.