A camera system comprises a camera for photographing an object and acquiring image data of the object, a computer having a connector which allows the camera to be connected to the computer, a mode setting device provided to the camera and for setting an operation mode of the camera, a display which functions together with the computer, and a controller provided to the computer. In one embodiment a method includes emitting light from a plurality of sources at a plurality of wavelengths and transmitting the light from the plurality of sources to a first device. The decision problem includes information about a plurality of outcome vectors that represent all possible outcomes and the uncertainties associated with the decision problem.