How does a hyperspectral sensor work?
Hyperspectral imaging (HSI) is a technique that analyzes a wide spectrum of light instead of just assigning primary colors (red, green, blue) to each pixel. The light striking each pixel is broken down into many different spectral bands in order to provide more information on what is imaged.
Where is hyperspectral imaging used?
Food: Hyperspectral imaging is widely used in the food sector. It is used in different discipline of food industry, bruise detection in apples, freshness of the fish, citrus fruit inspection, distribution of sugar in melons, and sorting of potatoes.
What is spectral sensing?
Chip-scale spectral sensing systems enable many existing and emerging applications, such as color picking, authentication and spectral analysis of substances, materials, foods and fluids. These systems are being adopted in the consumer, industrial and medical sectors.
What is a limitation of hyperspectral images?
The primary disadvantages are cost and complexity. Fast computers, sensitive detectors, and large data storage capacities are needed for analyzing hyperspectral data.
How many bands are there in hyperspectral?
Hyperspectral data sets are generally composed of about 100 to 200 spectral bands of relatively narrow bandwidths (5-10 nm), whereas, multispectral data sets are usually composed of about 5 to 10 bands of relatively large bandwidths (70-400 nm).
How many bands are there in hyperspectral imaging?
Hyperspectral images can contain as many as 200 (or more) contiguous spectral bands. The numerous narrow bands of hyperspectral sensors provide a continuous spectral measurement across the entire electromagnetic spectrum and therefore are more sensitive to subtle variations in reflected energy.
What makes the sensor a hyperspectral sensor?
Hyperspectral deals with imaging narrow spectral bands over a continuous spectral range, producing the spectra of all pixels in the scene. A sensor with only 20 bands can also be hyperspectral when it covers the range from 500 to 700 nm with 20 bands each 10 nm wide.
What is a color sensor?
A color sensor is a type of “photoelectric sensor” which emits light from a transmitter, and then detects the light reflected back from the detection object with a receiver.