光刻胶傅里叶全息图的记录条件对重构图像信噪比的影响

用光刻胶对具有不同空间频率的黑白二值条纹图像按各种不同条件记录了一系列傅里叶变换全息图 ,并用常规CCD摄像系统检测了重构图像的信息噪比 ,给出了信噪比与离焦量、参 -物光比和曝光量的关系曲线。实验结果表明 ,对给定的实验系统及记录介质存在一定的最佳离焦量和曝光量 ,对于不同空间频率的黑白二值条纹图像需要采用不同参 -物光比以获得最佳的信噪比。选择适当的记录条件可以对含有多种空间频率条纹的二值图像获得较好的重构效果。

The influence of recording conditions on the signal-to-noise ratio of retrieved images for photoresist Fourier transform holograms

A series of Fourier transform holograms were recorded on photoresist plates with various recording conditions for black-white digital images with different space frequencies.The SNR of images retrieved from the holograms was measured by a common CCD camera system.The SNR versus defocus distance,reference-to-object beam ratio and exposure is presented.The experiment results show that there are optimal defocus distance and exposure for the given system and recording material,and to obtain the best SNR different reference-to-object beam ratios are also needed for black-white digital images of different space frequencies.Retrieved image with good visual effect can be obtained for the digital image containing several space frequencies under proper recording conditions.