[技术问题] 相机实现对焦的原理？# PhotoGear - 摄影器材
c*l
1 楼
相机，是怎么实现对焦的？
具体点来说，通过镜头投射到CCD上的影像，相机本身的电脑如何知道图像是在焦内，
还是在焦外？是焦距小了，还是焦距大了？
具体点来说，通过镜头投射到CCD上的影像，相机本身的电脑如何知道图像是在焦内，
还是在焦外？是焦距小了，还是焦距大了？
y*d
3 楼
"相机是实现对焦的原理？"我看你还是写英语，但即使是英语这个也很难语法正确诶。
Camera is focusing theory?
Camera is focusing theory?
c*l
4 楼
看到了：
The process of autofocusing generally works as follows:
(1) An autofocus processor (AFP) makes a small change in the focusing
distance.
(2) AFP reads the AF sensor to assess whether and by how much focus has
improved.
(3) Using the information from (2), the AFP sets the lens to a new focusing
distance.
(4) The AFP may iteratively repeat steps 2-3 until satisfactory focus has
been achieved.
Thanks a lot!
【在 l******g 的大作中提到】
: http://www.cambridgeincolour.com/tutorials/camera-autofocus.htm
The process of autofocusing generally works as follows:
(1) An autofocus processor (AFP) makes a small change in the focusing
distance.
(2) AFP reads the AF sensor to assess whether and by how much focus has
improved.
(3) Using the information from (2), the AFP sets the lens to a new focusing
distance.
(4) The AFP may iteratively repeat steps 2-3 until satisfactory focus has
been achieved.
Thanks a lot!
【在 l******g 的大作中提到】
: http://www.cambridgeincolour.com/tutorials/camera-autofocus.htm
l*8
5 楼
学习了。原来原理上这么简单（比我原来想象的简单多了）。
【在 l******g 的大作中提到】
: http://www.cambridgeincolour.com/tutorials/camera-autofocus.htm
【在 l******g 的大作中提到】
: http://www.cambridgeincolour.com/tutorials/camera-autofocus.htm
l*g
6 楼
概念简单，具体情况算法可以很复杂
【在 l*****8 的大作中提到】
: 学习了。原来原理上这么简单（比我原来想象的简单多了）。
【在 l*****8 的大作中提到】
: 学习了。原来原理上这么简单（比我原来想象的简单多了）。
a*e
7 楼
this might be true for contrast AF.
for phase AF, it is bullshit.
focusing
【在 c********l 的大作中提到】
: 看到了：
: The process of autofocusing generally works as follows:
: (1) An autofocus processor (AFP) makes a small change in the focusing
: distance.
: (2) AFP reads the AF sensor to assess whether and by how much focus has
: improved.
: (3) Using the information from (2), the AFP sets the lens to a new focusing
: distance.
: (4) The AFP may iteratively repeat steps 2-3 until satisfactory focus has
: been achieved.
for phase AF, it is bullshit.
focusing
【在 c********l 的大作中提到】
: 看到了：
: The process of autofocusing generally works as follows:
: (1) An autofocus processor (AFP) makes a small change in the focusing
: distance.
: (2) AFP reads the AF sensor to assess whether and by how much focus has
: improved.
: (3) Using the information from (2), the AFP sets the lens to a new focusing
: distance.
: (4) The AFP may iteratively repeat steps 2-3 until satisfactory focus has
: been achieved.
l*8
8 楼
能不能大概解释一下phase AF是什么原理？
【在 a***e 的大作中提到】
: this might be true for contrast AF.
: for phase AF, it is bullshit.
:
: focusing
【在 a***e 的大作中提到】
: this might be true for contrast AF.
: for phase AF, it is bullshit.
:
: focusing
l*g
9 楼
http://en.wikipedia.org/wiki/Autofocus#Phase_detection
【在 l*****8 的大作中提到】
: 能不能大概解释一下phase AF是什么原理？
【在 l*****8 的大作中提到】
: 能不能大概解释一下phase AF是什么原理？
c*l
10 楼
zan
【在 l******g 的大作中提到】
: http://en.wikipedia.org/wiki/Autofocus#Phase_detection
【在 l******g 的大作中提到】
: http://en.wikipedia.org/wiki/Autofocus#Phase_detection
相关阅读
一个新人打算买K5，拉都拉不回来iphone 5非常好啊包子问个滤镜问题这个算是锐吗白瞎了这么好的题材佛爷们谁有2750刀的5D3转手？大包子求救，相机出问题了再来一个，摆出好POSE—雨天屋檐下的街拍动作 from dpnetexpert 封 burst 在 PhotoGear 版 (转载)给iphone5 买了膜 和 硅胶套Re: 闲来无事，奔一下我的音响吧 (转载)帕蒂进5D3 + XXBIS, 神器阿完了神事件。。。。。iPhone 5 demo照片都是1D拍的。 (转载)[FS] Pentax 14mm 2.8 NIB $590这个星期打算把相机买了，rx100，iphone5还是lumia920？大包子求一个HDC的邀请dxo让吴三桂居然跟尼康入门机一个分数