Binary representation of interference patterns for phase-shifting digital hologram

Abstract

Phase-shifting digital holograms can completely record the complex (amplitude and phase) wavefront information, containing three-dimensional object shape and relative position. In this study, we examine a binary representation for a phase-shifting digital hologram and apply it to three-dimensional object recognition and reconstruction. For this purpose, we derive an optimal threshold and quantized value for the binary representation of the interference patterns. The recognition results indicate that even with only one bit to represent the digital hologram, there is still enough information for us to recognize the three-dimensional objects. By using the proposed algorithms, one can easily implement the overall recognition process in real-time applications.

Keywords:

• digital holography
• phase-shifting
• object recognition

Acknowledgement

The author appreciated the experimental assistance from the Information Optics and Photonics Lab., National Taiwan Normal University.