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任何一幅图像,在用付立叶全息图方法制作匹配空间滤波器(MSF)和进行相关处理时都可以分成两部份来考虑:其一是图像透明片的直透部份,即孔径函数;其二是其衍射部份,即信息部份。当输入像在输入平面内移动时,前一部份的相关峰不发生移动,而后者的则作相应的移动。我们以前者作为基准使相关时的输入像与存贮在MSF中的参考像对准。此方法可以达到亚像对准精度。本文叙述其基本原理、实验装置、实验结果。
Any one image can be divided into two parts when making a Matched Spatial Filter (MSF) with the Fourier Hologram method and related processing: one is the penetration part of the image transparent film, namely, the aperture function ; The other is its diffraction part, that is, the information part. When the input image moves in the input plane, the first part of the correlation peak does not move, while the latter moves accordingly. We use the former as a reference to align the input image at the time of the correlation with the reference image stored in the MSF. This method can achieve sub-image alignment accuracy. This article describes its basic principles, experimental equipment, experimental results.