多聚焦图像融合的算法较多，主要由基于空间域和基于频率域的图像融合法组成。
There are many multi-focus image fusion algorithms, mainly consisted of the spatial area based and the frequency area based algorithms.
分数傅里叶变换同时包含了空间域和空间频率域信息，分数相关也可以用于光学图样识别。
The fractional Fourier transform contains the spatial information and the spatial-frequency information simultaneously. The fractional correlation can be used to optical pattern recognition too.
本文利用一个适应于表达和处理彩色医学内窥镜图像的颜色空间，分别从空间域和频率域两个方面讨论了该类图像的增强处理方法。
Characteristics of medical endoscopic image were analysed, and a new color space suit to express and process this kind of image were derived from RGB color system.
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