W*******o
发帖数: 301 | 1 what is focal point? how to find it from a set of image files?
How to do it in C++?
any suggestion? thanks. | L*****e
发帖数: 169 | 2 focal point就是焦点吧。如果成像是光源的空间fourier变换，该
像所在的位置就是focal plane.
【在 W*******o 的大作中提到】
: what is focal point? how to find it from a set of image files?
: How to do it in C++?
: any suggestion? thanks.
| W*******o
发帖数: 301 | 3 如果我有一系列的图片(index, 0, 1, 2, 3, 4, ...),分别是从不同的距离对object所
拍摄的,这些图片有的清楚,有的模糊,怎样才能从这些图片中估计出焦点呢?注意这些图
片不一定在焦平面上拍摄,所以估计出来的焦点可以是floating point. | L*****e
发帖数: 169 | 4 if you took the course of physics optics, you will see how the
patterns are different from each other. one of them is the fourier transform
of the source.
【在 W*******o 的大作中提到】
: 如果我有一系列的图片(index, 0, 1, 2, 3, 4, ...),分别是从不同的距离对object所
: 拍摄的,这些图片有的清楚,有的模糊,怎样才能从这些图片中估计出焦点呢?注意这些图
: 片不一定在焦平面上拍摄,所以估计出来的焦点可以是floating point.
| W*******o
发帖数: 301 | 5 I have not take that course yet. But this is the problem I need to finish
urgently.
So basically, the Fourier transforms of different pictures at different
distance can be used to predict the focal point, am I right? So I can take
FFT of each image and compare, but what is the target? I mean the fourier
transform of the actual source which I dont know.
Thanks.
transform
【在 L*****e 的大作中提到】
: if you took the course of physics optics, you will see how the
: patterns are different from each other. one of them is the fourier transform
: of the source.
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