Multi-spectral Imaging Using LED Illuminations

We present a multi-spectral imaging method, using five types of LED(Light Emitting Diode) light compensated with a tungsten light as the active illuminants, adapting a color camera to sample the spectral image. The imaging model of the multi-spectral imaging system is discussed, and the reflectance is reconstructed using the imaging system matrix derived from the imaging model. The imaging method is simple, low cost and requires no special equipment. The imaging accuracy and stability of the spectral reflectance reconstruction algorithm are discussed through three cases of multi-spectral imaging the Macbeth color checker, a color picture and a leaf infected with powdery mildew disease. It shows that the multi-spectral imaging system can be applied in a variety fields.