Digital Holographic Information Transmission over Noisy Channel

• Main Authors: Hua-Shuan Liao, 廖華炫
• Other Authors: Li-Chien Lin
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/23258080905067645912

碩士 === 逢甲大學 === 通訊工程所 === 94 === Phase-shifting digital holography is a technique that encodes the complex object wave by using the interference patterns. Whereas these patterns are captured by the charge-couple device (CCD) in digital form and thus the object wave can be digitally reconstructed by using computer. The essential advantage of the digital holography is that it can be stored and transmitted as the digital data. Recently researches provide some compression techniques to reduce the data rate before storing or transmitting the digital holography. In this paper, we study the statistical model for the transmission errors of the digital holography and a detection-correction approach is provided to reduce the transmission error. There are three kinds of the error models which include Impulse noise, bit error rate(BER) and additive white Gaussian noise（AWGN）. In the detection, we apply the redundant data in the four-step phase-shifting interference patterns to identify the noisy point. Then the adaptive reconstruction algorithm is used to correct the transmission loss of the interference patterns. The experimental results illustrate the performance of the proposed reconstruction algorithm to reduce the transmission error of the digital holography.