What exactly is hyperspectral imaging?
Hyperspectral imaging, or imaging spectroscopy, is probably one of the most promising and beneficial method among all the spectral imaging technologies. Generally speaking, it collects and processes information from across the electromagnetic spectrum in order to received the spectrum for each pixel in the image of a scene. Therefore, every pixel in the image contains a continuous spectrum in radiance or reflectance. This can be used for further processing to characterize the objects in the scene with extreme precision and particularity. Hyperspectral imaging brings us truly fantastic opportunities in many fields where can be UAV applications useful. The latest hyperspectral frame sensors open new application areas for light weight UAV imaging.
Advantages of hyperspectral imaging
The colour spectrum, visible with human eye (red, green and blue bands) is devided into even more spectral bands. Hyperspectral imaging thus extend the obtained imagery beyond the visible spectre, with recording and covering a wide range of wavelengths. That is the basic reason why hyperspectral cameras are able to provide much more detailed informations about the scene than standard colour imaging, operating only in limited three spectral channels corresponding to the visual primary colours. Generally speaking, with hyperspectral imaging you will be able to vastly improve your ability of classifying the objects in the scene based on their spectral abilities. The scene is being captured with the camera line by line using a so-called “pushbroom” scanning mode. In this method is one narrow spatial line in the scene imaged at a time and then is split into its spectral components before it reaches the sensor array.
Applications of Hyperspectral imaging
Hyperspectral imaging offers a wide range of applications and though its possibilities and potential still have not been fully discovered yet. Hyperspectral cameras can be configured for imaging out to 2500nm, which is including a huge portion of the infrared spectrum.
Verily, this abilities can bring essential benefit in many applications. Hyperspectral imaging recently took the step from slow and unreliable research prototypes to realiable and accurate analytical instruments for application from industrial monitoring to laboratory measurement, medical diagnostic, or UAV and satellite based remote sensing tools. In combination with the UAS technology could open hyperspectral imaging truly new and unforseen horizons. Although it was originaly developed for geology and minig, it is nowadays spreading into many fields of industry, science, or commercial use, such as ecology and surveillance, historical manuscript research, precision agriculture, or even eye care. In food processing can hyperspectral imaging help to indentify and remove defects or foreign materials, which are invisible to standard cameras. Another applications are possible in surveillance, especially for military purposes. Apparently, it is no surprise that hyperspectral imaging is playing its important part in physics, chemistry and astronomy as well.
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