Based On The Surface Of The Digital Holographic Detection

Digital holography is a mix of optical holography, photoelectrical imaging technology and computer technology. It utilizes charge coupled device(CCD) to record holograms instead of silver print which is used for the recording medium in optical holography and use computer programming to reconstructed the original object numerically. The digital holography pick up the reconstruction time by full numberical recording, storing and reconstructing process, and we can use mature digital image processing technology to dispose the reconstructed image to make it lcear.The preliminary study of digital holography technology carries out through theoretical analysis, experiments and couputer simulation. The main work is as follows:Firstly, basic principles and interrelated theoretics of optical holography and digital holography are introduced. Besides, the theories such as recording digital hologram, numerical reconstruction and the related digital image processing methods are analyzed.Secondly, simulation of computer-generated holography is completed. Image pre-processing is investigated and discussed. Interference image sinal after processing is strengthened.At last, by starting with optical holography experiment, primary detection and analysis of exterior of the metal sphere and holography reconstruction are carried out.