| 摘要 |
PURPOSE:To obtain a simple-structure conversion filter which can restore image information, by converting optically image information to information which cannot be discriminated and usig converted image information in the opposite direction. CONSTITUTION:A forcusing system E using a filter optical system is provided with a filter 3 consisting of plural minute constituting parts. In figure, light convergent fibers or light convergent rod lenses 1' are shown with black circles, and parallel plane columns 2' are shown with white circles. Consequently, since images passing through light convergent fibers or light convergent rod lenses 1' are inverted and images passing through parallel plane columns 2' are not inverted, a copy object indicated in figure by (a) is converted to an image (b) by the conversion filter 3, and the original object cannot be discriminated. |
