Optical filters are important components for machine vision applications. They’re used to maximize contrast, improve color, enhance subject recognition and control the light that’s reflected from the object being inspected. Midwest Optical Systems (MidOpt) sets the industry standard for filter performance, and uses a cutting-edge Robotic Assembly & Inspection System, which ensures quality and repeatability in their manufacturing and inspection process.

Consistent Quality Inspection: The MidOpt Robotic Inspection Station guarantees consistency and uniformity when inspecting scratches, digs and other cosmetic defects. A greater variety of inspection lighting is utilized, increased magnification and additional inspection steps are employed, and the variability of individual perception is removed from the inspection equation. This results in pristine optical surfaces and superior image quality.

Torque Controlled Mounting: When assembling optically flat, precision polished filters into tightly screwed down filter mounts, interferometric measurements reveal drastic deformations caused by the stress of assembly. The resulting optical distortion can significantly impact image quality. The MidOpt Robotic Assembly Station allows each filter to be gently and securely held in the filter mount by the retaining ring. After ideal torque is applied, controlled amounts of thread-locking compound are dispensed to prevent the retaining ring from shifting.

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Palatine, IL. (May 28, 2020) – Each camera features a Midwest Optical Systems LP780 IR longpass filter that blocks most light under 780 nm wavelengths, to make sure light is captured primarily from the IR LEDs, versus capturing ambient light. Blocking visible daylight also eliminates shadow effects in the driver’s immediate area that may interfere with the accuracy of face recognition algorithms.

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About Midwest Optical Systems (MidOpt)
Midwest Optical Systems (MidOpt) has more than 30 years of experience and innovation in the fields of optical design, fabrication and inspection. MidOpt is a worldwide leader in machine vision filters and optical solutions. They are represented in over 30 countries and offer more than 3,000 cutting-edge products.

Triple Bandpass Filters are tools that allow us to go above and beyond traditional Normalized Difference Vegetation Index (NDVI) indicators to reinvent the way we monitor crop health and collect more information than ever before.

Traditionally, NDVI was used to determine plant health, which incorporates a camera with a red and near-infrared (NIR) filter—and the equation NDVI = (NIR – Red)/(NIR + Red). While this is a great tool, scientific advances have found that modifying this calculation can provide even more details about crop and field health. Similarly to red light, healthy plants also absorb visible blue light. And in addition to NIR light, healthy plants also reflect some visible green light. These facts enable us to assess crop health quickly, inexpensively and in realtime using converted consumer cameras and unmanned aerial vehicles.

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