Computer-Generated Holography Using a Digital Signal Processor

We present an implementation of the One-Step Phase-Retrieval (OSPR) algorithm for computer-generated holography (CGH) using a digital signal processor (DSP). Typically, personal computers with powerful graphics processing units and field programmable gate arrays are used for hologram generation. Such systems, however, are of high-cost and usually not suitable for embedded applications. We use a Texas Instrument TMDXEVM6678LE evaluation module carrying a TMS320C6678 eight-core DSP to evaluate the implementation performance. We implement a fast generation method based on OSPR and demonstrate both binary-phase and multi-level-phase generation results. We evaluate the performance of the DSP implementation and compare it to that of a personal computer. We also project the generated hologram with a lab-based projection system. The results show that, although our DSP board has a performance that is on average slower than a modern six-core central processing unit, an embedded DSP for CGH due to its low-power, low-cost and minimal profile is promising.