Method of multispectral imaging and an apparatus thereof

A multispectral imaging system comprising:

• a microcontroller which generates an on-off control signal indicating an on-off combination of light sources illuminating a scene in a frame and generates an operation control signal in synchronization with the on-off control signal;
• a plurality of light sources that turn on according to the on-off combination indicated by the on-off control signal to illuminate the scene, wherein the light sources comprise at least one light-emitting diode cluster;
• a RGB camera which captures an image of the scene on the basis of the operation control signal;
• and a multispectral image generator which determines a plurality of spectral basis functions and weights of the spectral basis functions, and acquires a continuous spectral reflectance by summing values obtained by multiplying the spectral basis functions and respective weights,
• wherein the on-off combination of the light sources to be illuminated to the scene is determined by a weight matrix minimizing offset of a spectral reflectance of a predetermined representative material to the spectral basis functions, camera channel, spectra of the light sources, and number of frames (N).

A multispectral imaging method comprising:

• determining an on-off combination of a plurality of light sources illuminating a scene;
• illuminating the scene with the light sources according to the on-off combination selected on the basis of a first control signal generated by a microcontroller;
• capturing an image of the scene by operating a camera on the basis of a second control signal synchronized with the first control signal;
• determining a plurality of spectral basis functions and weights of the spectral basis functions;
• and acquiring a continuous spectral reflectance by summing values obtained by multiplying the spectral basis functions and respective weights, wherein the on-off combination of the light sources to be illuminated to the scene is determined by a weight matrix minimizing offset of a spectral reflectance of a predetermined representative material to the spectral basis functions, camera channel, spectra of the light sources, and number of frames (N).