Multispectral and hyperspectral imaging are two related techniques used in remote imaging and sensing. Both methods involve capturing images across a range of wavelengths, but they differ in the quantity and narrowness of the spectral bands used.

Several different spectral bands, usually three to ten, are used in multispectral imaging to capture images. Contrarily, hyperspectral imaging takes pictures in hundreds or even thousands of narrow, contiguous spectral bands.

Multispectral Imaging Applications

Multispectral imaging captures a wide range of light wavelengths, identifies objects and materials of interest, detects environmental changes, and produces detailed scene images.

In agriculture, multispectral imaging is used to monitor crop health, spot diseases, and pin down areas that need more irrigation or fertilization. It makes it possible for researchers to keep tabs on environmental changes, including shifts in land use, deforestation, and the effects of climate change, as well as natural resources like water quality and vegetation cover.

Multispectral analysis can also be used in defence and security applications, such as identifying camouflage or finding hidden objects, as well as to track weather patterns, diagnosing diseases such as skin cancer by analysing different layers of skin tissue.

Hyperspectral Imaging Applications

Hundreds of contiguous spectral bands can be used in the hyperspectral imaging technique to capture and analyse images, giving a high level of spectral resolution.

Hyperspectral imaging can detect pollutants or changes in vegetation, soil, and water bodies in addition to identifying changes in land use for ecological monitoring. In precision agriculture, hyperspectral imaging can be used for weed detection, crop health assessment, disease and nutrient deficiency detection and soil composition analysis. In medical diagnostics, hyperspectral imaging can detect skin cancer and monitor wound healing.

Computar's Hyper/Multispectral Lens Series

A proper lens is essential for regulating the field of view, resolution, and other aspects of imaging. Computar's acclaimed ViSWIR Hyper/Multispectral Lens Series, designed for the newest Visible + SWIR imaging sensors, minimizes focus shift within a few microns in the 400 to 1700 nanometre visible and shortwave infrared range. Additionally, a broadband anti-reflection coating is applied to all lens elements to reduces the negative effects of lighting. This makes the ViSWIR Series the wise choice because it enables spectral imaging with a single-sensor camera by simply synchronizing the lighting.

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(This "Corporate  News" Published in April 2023 Edition)