Special-purpose computer HORN-5 for a real-time electroholography

Abstract

In electroholography, a real-time reconstruction is one of the grand challenges. To realize it, we developed a parallelized high performance computing board for computer-generated hologram, named HORN-5 board, where four large-scale field programmable gate array chips were mounted. The number of circuits for hologram calculation implemented to the board was 1,408. The board calculated a hologram at higher speed by 360 times than a personal computer with Pentium4 processor. A personal computer connected with four HORN-5 boards calculated a hologram of 1,408 x 1,050 made from a three-dimensional object consisting of 10,000 points at 0.0023 s. In other words, beyond at video rate (30 frames / s), it realized a real-time reconstruction.

Interactive color electroholography using the FPGA technology and time division switching method

“…In order to solve the enormous computational time for a CGH, for instance, some software approaches perform fast computation of a full-parallax CGH by translating the expression of CGH into recurrence formulas [4,5,6]. These approaches can compute CGHs at high speed; however, even for a general computer on which these approaches are implemented it is difficult for CGHs to compute in real time.…”

“…Fortunately, CGH calculation is suitable for implementation into hardware. We have proposed a hardware approach using the FPGA technology for rapid CGH calculation [3,6]. Figure 1 shows the photograph of the electroholographic display unit and the outline of the SPC, respectively.…”

“…The SPC automatically starts the computation of a CGH after receiving the datum. The SPC implemented by pipeline architecture, can perform CGH computation using our recurrence formulas algorithm [3,6] faster than a personal computer. After finishing the computation, the SPC sends the CGH data to the LCD controller.…”

Special-purpose computer with highly parallel pipelines for solution X-ray scattering analysis of macromolecules XSAM-2

“…We developed XSAM-2 using a large-scale FPGA board made by our study group [8]. On this board, four FPGA chips were mounted.…”

Using Commodity Graphics Hardware for Real-Time Digital Hologram View-Reconstruction

“…Ito et al [18] have built several generations of a special purpose hardware platform for point-based CGH. Masuda et al [19] and Ahrenberg et al [20] have presented strategies for accelerated CGH generation on graphics hardware.…”