Xu Li, Mater Mike, Ni Jun
Department of Mechanical Engineering, University of Michigan—Ann Arbor, 1210 HH Dow, 2300 Hayward Street, Ann Arbor, Michigan 48109, USA.
Opt Express. 2011 Aug 1;19(16):14779-93. doi: 10.1364/OE.19.014779.
The majority of focus detection criteria reported is based on amplitude contrast. Due to phase wrapping, phase contrast was previously reported unsuitable for focus finding tasks. By taking the advantage of multi-wavelength digital holography, we propose a new focus detection criterion based on phase contrast. Experimental results are presented to prove the feasibility of the developed criterion. Possible applications of the developed technology include inspecting machined surfaces in the auto industry.
所报道的大多数焦点检测标准都是基于幅度对比度。由于相位包裹，先前有报道称相位对比度不适合用于焦点查找任务。通过利用多波长数字全息术，我们提出了一种基于相位对比度的新焦点检测标准。给出了实验结果以证明所提出标准的可行性。所开发技术的可能应用包括汽车工业中对加工表面的检测。
