Du Sik Park

Fast hologram pattern generation by radial symmetric interpolation

In this paper, we present a fast hologram pattern generation method by radial symmetric interpolation. In spatial domain, concentric redundancy of each point hologram is removed by substituting the calculation of wave propagation with interpolation and duplication. Also the background mask which represents stationary point in temporal domain is used to remove temporal redundancy in hologram video. Frames are grouped in predefined time interval and each group shares the background information, and hologram pattern of each time is updated only for the foreground part. The effectiveness of proposed algorithm is proved by simulation and experiment.

Fast hologram pattern generation by wave field translation

In this paper, we present a fast hologram pattern generation method to overcome accumulation problem of point source based method. Proposed method consists of two steps. In the first step, 2D projection of wave field for 3D object is calculated by radial symmetric interpolation (RSI) method to the multiple reference depth planes. Then in the second step, each 2D wave field is translated toward SLM plane by FFT based algorithm. Final hologram pattern is obtained by adding them. The effectiveness of method is proved by computer simulation and optical experiment. Experimental results show that proposed method is 3878 times faster than analytic method, and 226 times faster than RSI method.

2D/3D mode switchable backlight design

In this paper we review the 2D/3D mode switching technologies and suggest a new design for the 2D/3D switchable backlight unit (BLU) with the prism-shaped light extracting pattern structured on the light guide plate (LGP).

GPU implementation of wave field translation method for fast hologram generation

In this paper, we proposed parallel processing method of 2 step wave field projection method using GPU. In the first step, 2D projection of wave field for 3D object is calculated by radial symmetric interpolation (RSI) method to the reference depth, and then in step 2 it is translated toward depth direction using Fresnel transformation. In each step, the object points are divided into small groups and processed in each CUDA cores in parallel. Experimental results show that proposed method is 5901 times faster than Rayleigh-Sommerfeld method for 1 million object points and full HD SLM resolution.

Complexity analysis in holographic 3D video generation

Realizing the very natural video by using holography technology is thought as the ultimate goal of 3D display, and it is still remained as the Holy Grail to be explored. Difficulties lie on two challenging issues: development of the Giga-pixel holographic video display which is feasible and meaningful for commercialization and fast calculation algorithms for the real-time holographic video generation. This presentation reviews the current status in holographic video generation methods in the aspect of the latter issue. The recent algorithms can be categorized into two main concepts of the point source hologram and the Fourier transform hologram. By analyzing the complexity of the algorithms, we realized that there is a common limitation regardless of the type of algorithms. I will address this issue and discuss the research directions to move one step forward for the commercial holographic video displays.