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本实验是激光散斑在图象处理中的应用。利用激光散斑实现图象相减,实际上就是把激光斑纹图样用作信息的无规载体,来调制要处理的信号,这种调制产生的载有信息的噪声中所含空间频率的高频成分在透镜后焦面上形成一个扩散开了的衍射图样,然后再对此衍射图样进行空间滤波处理,将含有两图象相同部分的空间频率滤去,最后得出它们相差别的部分,即得出相减结果。实验过程:①先制备待处理的两图象的干片Q,本实验中是两张太阳黑子照片和两张气象卫星所摄地球云图照片,每组分别是在不同时刻,同一位置上拍
This experiment is the application of laser speckle in image processing. The use of laser speckle image subtraction, in fact, is to use the laser speckle pattern as a random vector of information to modulate the signal to be processed, the modulated information-generated noise contained in the spatial frequency of high-frequency The composition forms a diffused diffracting pattern on the back focal plane of the lens and then spatially filters the diffracted pattern to filter out the spatial frequencies containing the same part of the two images and finally finds the difference between them Obtain subtraction results. Experimental process: ① Preparation of two images to be processed dry Q, in this experiment is two photos of sunspots and photos taken by two meteorological satellite images of the Earth, each at different times, the same position on the beat