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Filter Types

MidOpt filters are the premier solution for industrial imaging to ensure flawless control, dependable results, unmatched repeatability and exceptional image quality for monochrome and color vision systems. Filters have the ability to block all unwanted ambient light and pass only the necessary light output while increasing contrast and resolution. Whether your vision system is counting items, reading codes or examining specific objects for defects, optical filters can help you achieve a more stable, accurate system.

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Key Features of a Quality Machine Vision Filter

Optical filters are critical 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. A machine vision filter is not just a machine vision filter. Here’s what to look for when choosing a filter for your machine vision system…

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StablEDGE® Filter Design

Short-shifting occurs when conventional filters are placed in front of industrial imaging lenses with focal lengths of 12mm or less. StablEDGE® filters utilize absorptive filter glass to form the leading edge of the filter passband. This assures no shifting in this region, even when the lens field-of-view exceeds 100 degrees.

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Gaussian Transmission Curve

Some filters on the market have a high, flat transmission profile. With this design, an overwhelming amount of ambient light is able to pass through at the weaker tail ends of the LED spectral output curve. To ensure maximum performance, the position, height and width of the passband should emulate the bell-shaped spectral output curve of the LED illumination being used.

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High-Transmission Anti-Reflection Coating

When a ray of light passes through a glass surface, a portion of the light is reflected, resulting in a 4% transmission loss per surface. MidOpt uses anti-reflection coating on all filter designs, reducing surface reflection to less than 1%. This improves the efficiency of the vision system by increasing transmission, enhancing contrast and eliminating ghost images.

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Performance & Repeatability

MidOpt sets the quality standard for machine vision filters. Every filter is examined to ensure near-flawless surface quality and is 100% inspected by state-of-the-art spectrophotometer technology to ensure optimal performance and repeatability. They are also one of the only manufacturers to use controlled torque when securing filters into their mounts, eliminating distortion and guaranteeing optical flatness.

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How to Choose an Optical Filter

In order to select the best filter, you’ll need to pinpoint your objective or the imaging problem you’re currently having. One of the most common filters used for enhancing vision systems is a bandpass filter.

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Applications with MidOpt Filters

Whether your vision system is counting items, reading codes or examining specific objects for defects, optical filters can help you achieve a more stable, accurate system. Many varieties of optical filters are available, depending on your application. Just some of the industries we serve include machine vision/factory automation, security and surveillance, license plate recognition/ITS, medical and life science, agricultural inspection/NDVI, aerial imaging, motion analysis, photography and cinematography.

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History of Optical Filters

For more than 100 years, photographers have used filters to reduce reflections, balance color and enhance the contrast in black-and-white photos. In hopes of achieving similar results, integrators across the world have attempted to use photographic filters in industrial vision systems, but digital cameras used in machine vision systems are unable to function at an advanced level with photographic filters.

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