Abstract
A novel approach for the measurement of information content of light field on the object surface illuminated by various coherent states source based on the statistical optics theory and Shannon’s information theory has been proposed. Firstly, we propose that the information content of light field on the object surface can be regarded as the product of the spacial freedom degrees of the object surface itself and that of the illuminating light field arriving at the object surface. Then, calculate the distribution of complex degree of coherence on the object surface under various coherent states illumination and then obtain the number of uncorrelated areas of light field on the object surface which can be used to determine the number of freedom degree of the light field. At the same time, taking into account the structure of the object itself, the freedom degree of the light field on the object surface in completely coherent, partially coherent and incoherent illumination are derived respectively.The specific algorithms for the information content of the light field illuminated by a 1D linear incoherent light source and uniform quasi monochromatic incoherent surface light source with arbitrary shape are also presented.
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