N****r
发帖数: 507 | 1 偶在学物理光学时先了解了一个“空间频率”
那是在学透镜的二维傅立叶变换及阿贝成象实验时
讲的。空间频率对应平面光传播方向。
现在图像处理中也有这一概念，好象是不同取向不同密度的条纹，
请问这两个空间频率是否有联系。 | z*r
发帖数: 9 | 2 You can say it's the same term, for a grating with
period a, illuminated by incident coherent beam, then
the diffracted light has the frequency cos(sita)/lambda,
but a*cos(sita)=m*lambda according to grating theorem,so
the frequency could also be represented as m/a, which is
the fouriers series's each order's frequency in
"image processing", so we can see in physical optics and
image science, the two term is actually equivalent.
【在 N****r 的大作中提到】
: 偶在学物理光学时先了解了一个“空间频率”
: 那是在学透镜的二维傅立叶变换及阿贝成象实验时
: 讲的。空间频率对应平面光传播方向。
: 现在图像处理中也有这一概念，好象是不同取向不同密度的条纹，
: 请问这两个空间频率是否有联系。
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