IMAGE INFORMATION PROCESSOR USING SPATIAL OPTICAL MODULATION ELEMENT

摘要

PURPOSE:To provide an image information processor capable of finely controlling a filter characteristic. CONSTITUTION:The spatial optical modulation element SLMr is provided on a common focal plane of both lenses of a Fourier transform lens and an inverse Fourier transform lens in a dual Fourier transform optical system, and a light beam intensity-modulated by an input image is inputted to the SLMr. An optical image of prescribed spatial filter information displayed by a time sequential signal is imparted to the spatial optical modulation element SLMr. A driving voltage value is set switchably to a state where the optical image dealing with the spatial filter information is outputted as a positive image and the state where the information is outputted as a negative image from a driving power source 6 selected to a driving frequency so that a difference between the light quantity of output beams outputted from the spatial optical modulation element SLMr dealing with a black level and a white level in the optical image of the spatial filter information becomes maximum. The operation area of the spatial optical modulation element SLMr is revised so that a spatial filter shows a filter characteristic so that whose transmission region and an attenuation region become the exact opposite by switching the driving voltage value.