| Digital hologram is a kind of optical information processing technology with digital. It is a combination of traditional holography and modern electronic technology. By the way of recording and processing the holographic image by digital method, it is not adopt the traditional holographic photographic way of chemical processing, so that the processing is simplified. It is also convenient to improve the quality of the image and to extract the needed information by digital image processing.In this paper, CCD has been applied to holographic interferometry combined with EALCD, which adds new content and method to the development and application of holography. On the basis of theory analysis, a new method that combined image plane hologram with double-exposure interferometry, and combined CCD with EALCD is used in displacement measurement. This method has been improved feasible by both optical experiment and digital experiment. Furthermore, it has been applied in Fresnel holographic experiment and we got outline information of reconstruction image. At last, we try to process the holograms and reconstruction image with digital image processing technique. The result of the experiment is satisfying.
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