12/18/2023 0 Comments Multispec camera![]() Often these ranges are characteristic enough for the full spectrum and can be used to differentiate between soil and vegetation. Instead of measuring all bands in the visible range, multispectral cameras take certain areas and measure the spectral information in these ranges. Reflectance properties of healthy and unhealthy vegetation compared to soil. An easy example for a two-band index is the Normalized Digital Vegetation Index (NDVI) that compares the red reflection with the red or green reflection to differentiate vegetation from non-vegetation such as soil. Hence, you compare only the spectral regions that typically have different absorption rates depending on the plant status. To overcome that issue, spectral indices can be computed, which is a ratio of one or more wavelengths that is used to normalize the data. In addition to that, the spectral reflectance of plants strongly varies with the imaging conditions, such as leaf angles or distances from the sensor. Yet, working with hyperspectral cameras remains a computationally challenging- and a financially intense endeavor. Hyperspectral sensors gained rising attention in plant phenotyping as they deliver a great insight into the spectral absorbance of plants. Based on the displacement of the laser line in the image the height of each point along the line can be calculated. ![]() The image of the camera can be seen on the right. A camera (blue) captures the reflection of the laser line under a certain angle. A laser line (red) is project vertically on the plant. Measurement concept of 3D light section scanners. Although, 3D sensors such as PlantEye can be the workhorse for every phenotyping platform, it still lacks the ability to measure changes in color or other spectral information that are an important indicator for the plants physiological status. 3D assessment of plants became a commonly used technology in plant phenotyping to measure morphological and architectural features of plants.
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