Fig. 2From: Improved classification accuracy of powdery mildew infection levels of wine grapes by spatial-spectral analysis of hyperspectral imagesHyperspectral image. Visualization of a hyperspectral image cube with grape bunch, PTFE reference plate, and background materials. The hyperspectral image consists of different layers which directly correspond to the reflection of narrow wavelength bands. The PTFE reference plate is calibrated and used for data normalizationBack to article page