Posted March 13, 2019 at 8:46 am by by56014904

Three essential elements for optical lens selection

The robot vision inspection system is characterized by increased flexibility and automation. In some dangerous working environments that are not suitable for manual work or where artificial vision is difficult to meet the requirements, machine vision is often used instead of manual detection. At the same time, in large-scale industrial production process, manual visual inspection is used to check product quality with low efficiency and low precision. Machine vision inspection methods can greatly improve production efficiency and automation of production. Moreover, machine vision is easy to implement information integration, and is the basic technology to realize computer integrated manufacturing. The product can be measured, guided, detected, and identified on a fast-producing production line, and the production task can be completed with quality and quantity.

In a robotic vision system, it is important to get a high quality, manageable image. The success of the system must first ensure that the image quality is good and the features are obvious. The failure of a machine vision inspection project was mostly due to poor image quality and inconspicuous features. To ensure a good image, you must choose a suitable zero order/multiple order/achromatic optical waveplate.
Basic elements of optical lens selection

Contrast is very important in smart high precision optical waveplate. The illumination task of machine vision applications is to create a large contrast between the features that need to be observed and the image features that need to be ignored, thus facilitating the differentiation of features. Contrast is defined as having a sufficient amount of grayscale difference between the feature and the area around it. Good lighting should be able to ensure that features that need to be detected stand out from other backgrounds.

Another way to test a good light source is to see if the light source is sensitive enough to the position of the part. When the light source is placed in a different area of ​​the camera’s field of view, the resulting image should not change. A highly directional light source increases the likelihood of specular reflections in the highlighted area, which is detrimental to subsequent feature extraction.

When choosing two high-quality laser grade optical waveplate, the better choice is the brighter one. When the light source is not bright enough, there may be three bad conditions.
1. The signal to noise ratio of the camera is not enough;
2, because the brightness of the light source is not enough;
3. The contrast of the image is not enough, and the possibility of noise appearing on the image also increases.

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