電腦全像投影顯示系統研究

Abstract

本論文探討以空間光調制器顯示電腦全像片之遠場繞射投影成像顯示技術，並結合紅外光人體感測系統之互動式影像研究。 我們採用對稱式遞迴傅立葉轉換演算法設計純相位電腦全像片，並經由遠場繞射之傅立葉轉成像。我們以電腦模擬其光學重建影像，以重建影像之訊雜比及誤碼率為參數分析影像重建品質，並設計光學投影系統驗證之。我們評估此電腦全像投影系統對於空間光調制器之調制能力需求限制。最後，結合光學實驗及人體感測儀器，我們以互動式投影系統演示數字計算。

In this thesis, we discuss the holographic projection display by the use of computer generated hologram (CGH) displayed by spatial light modulator (SLM). With the connection of near-infrared ray human motion sensor, an human-interactive projection system is proposed. A phase-only CGH, as known as Kinoform, generated by applying symmetric iterative Fourier transform algorithm (SIFTA) which enhances projected image quality is employed for its better diffraction efficiency. We have simulated the reconstruction image by Matlab program. The parameters of signal noise ratio (SNR) and bit error rate (BER) for quantifying the image quality are analyzed. We design an optical setup to verify the simulation results above and the projection image can be found after the distance of Fraunhofer approximation. Further, We have assessed the impact of LCoS modulation capabilities on diffractive imaging, and concluded the physical restrict of this projection method. Finally, we design an interactive projection system to demonstrate a projection keyboard.