As there are many noise influences such as speckle noise in the reconstructed object light field, how to obtain a high quality wrapped phase image is one of the most important part in holographic interferometry. The principle of holographic interferometry is introduced and a new algorithm for holographic interferometry is put forward. And it is also verified by experiments. The experiment result shows that the new algorithm is not only simpler than the traditional algorithm but also can obtain a higher quality wrapped phase image with less noise. It is convenient for the subsequent phase-unwrapping work.
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