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本文论述一种实时图像相减的原理和方法。有两种全息照相方法可以实现图像相减。一种是根据盖伯(Gabor)在1965年提出的实验方法;而另一种是使用未显影的重铬酸明胶做为记录介质,实现图像的实时相减。本文将重点介绍后一种方法。研究结果表明,实时全息底片的衍射效率可通过控制记录时的相对温度达到最大值。此项研究工作得到加拿大自然科学与工程研究学会的支持。资助项目编号为A—0360。
This article discusses a principle and method of real-time image subtraction. There are two holographic methods to achieve image subtraction. One is based on the experimental method proposed by Gabor in 1965; the other is the use of undeveloped dichromated gelatin as a recording medium for real-time image subtraction. This article will focus on the latter method. The results show that the diffraction efficiency of a real-time holographic negative can be maximized by controlling the relative temperature at recording. This work is supported by the Canadian Society of Natural Science and Engineering Research. The grant number is A-0360.