Optimized double-coefficient error diffusion method for suppressing speckle noise in holographic display

Abstract

In this paper, we propose an optimized double-coefficient error diffusion method to suppress the speckle noise in computer-generated holography. The information of the object is recorded as a complex amplitude hologram (CAH). Then, the CAH is converted into a phase-only hologram (POH). In this process, the even and odd row pixels of the CAH are scanned bidirectionally and further processed. The phase error is compensated to two adjacent pixels that have not been visited before. Meanwhile, the optimal diffusion direction and coefficient are selected. The POH is loaded on the spatial light modulator during optical reconstruction. Compared to the traditional double-coefficient error diffusion method, the proposed method is optimized for the pixel scanning direction, error diffusion direction and diffusion coefficient. Finally, the experimental results demonstrate improved reconstruction quality with the proposed method.