Multi-spectrum imagery

Macbeth color chart (Fig. 1)

In conventional color imagery, 3 different images are acquired corresponding to red, green and blue. In multi-spectral imagery, far more images are obtained each image corresponding to a very narrow band of the spectrum.

In this way, definition of the light reflected by a surface is far more accurate and gives access to characterictics that are not visible to the naked eye.

Spectral bands can be chosen as a function of the wavelength characterizing materials or products to be analyzed.

Examples of data taken from multi-spectral imagery : each pixel of the image (figure 1) contains spectral information (graph below)