![]() ![]() The Spectrum: Light in Different Wavelengths and Their Utilization in Imaging ApplicationsĪs a form of electromagnetic wave, all types of light, including those invisible to the human eye, also come in different wavelengths and frequencies many real-world applications rely on visual systems that are designed for capturing particular spectral ranges.Ĭameras equipped with the appropriate image sensor and optical filter can utilize a big portion of the electromagnetic spectrum to create imaging solutions for many industries and scientific fields.īelow is a list of typical wavelengths and their respective applications. ![]() However, when it comes to industrial, medical, or other imaging applications (embedded or not), where camera systems are built for inspection purposes, where only certain bands of the spectrum are required, where light beams need to be segmented before they can reach the image sensor, things become more complex, and that’s why we need optical filters. Camera modules in many consumer products, like camcorders, action cameras, webcams, and cellphones, usually have an infrared-blocking filter in front of the image sensor to deal with sensitivity issues, this is one of the most common types of optical filters used in modern-day digital cameras. ![]() If you try to tear a camera module down to see what it’s made with, you will likely find that, together with an image sensor, a lens, and a PCB board, there’s also an optical filter in it. What Optical Filters Are, How They Work, and Why You Need ThemĪn optical filter controls how a camera module captures light at the spectral level. ![]()
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