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采用方向性滤波与极低频滤波相结合的方法,可以从较复杂的图象中提取所需用的信号.为了在相干象增强系统中提高象的对比度,突出所需用的信号,采用了偏振滤波器.只要改变照明光的振动面与滤波器振动面之间的夹角,就能在一个较宽的光强度范围内,连续调节低频成份的衰减量,从而很方便地得到最佳象的对比度.利用上述方法进行了从具有高、低频背景图象中提取地震波信号的实验.实验结果表明,我们对这种综合的空间滤波技术的尝试是成功的.
Using a combination of directional filtering and very low frequency filtering, the desired signal can be extracted from the more complex image To emphasize the contrast of the image in a coherent image enhancement system, highlighting the desired signal, polarization Filter.As long as the angle between the vibrating surface of the illuminating light and the vibrating surface of the filter is changed, the attenuation of the low frequency component can be continuously adjusted within a wide range of light intensity so that the best image Contrast The experiment of extracting seismic wave signals from high and low frequency background images is carried out by the above method.The experimental results show that our attempt to this kind of synthetic spatial filtering technique is successful.