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1 June 2016 Random phase-free computer holography and its applications
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Random phase is required in computer-generated hologram (CGH) to widely diffuse object light and to avoid its concentration on the CGH; however, the random phase causes considerable speckle noise in the reconstructed image and degrades the image quality. We introduce a simple and computationally inexpensive method that improves the image quality and reduces the speckle noise by multiplying the object light with the designed convergence light. We furthermore propose the improved method of the designed convergence light with iterative method to reduce ringing artifacts. Subsequently, as the application, a lensless zoomable holographic projection is introduced.
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Tomoyoshi Shimobaba, Takashi Kakue, and Tomoyoshi Ito "Random phase-free computer holography and its applications", Proc. SPIE 9867, Three-Dimensional Imaging, Visualization, and Display 2016, 98670M (1 June 2016);

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