Zhou Jin, Gao Wenqi. Encoding of pseudocolor equidensities using combined Ronchi gratings[J]. Chinese Journal of Lasers, 1986, 13(10): 643
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According to the halftone principle, a screen is introduced which is composed of Ronchi gratings by means of theta modulation. The screen can be used to encode a picture with continuous gray tones. The encoded picture can be demodulated by a spatial filtering system with a polychromatic source. A picture with pseudocolor of equidensity can be gained.The screen can be made easily and developed into multi-density slices.