英语翻译If anything is in motion within the field of view,it is

英语翻译
If anything is in motion within the field of view,it is necessary to take both images at once,either through use of a specialized two-lens camera,or by using two identical cameras,operated as close as possible to the same moment.
A single digital camera can also be used if the subject remains perfectly still (such as an object in a museum display).Two exposures are required.The camera can be moved on a sliding bar for offset,or with practice,the photographer can simply shift the camera while holding it straight and level.This method of taking stereo photos is sometimes referred to as the "Cha-Cha" or "Rock and Roll" method.
A good rule of thumb is to shift sideways 1/30th of the distance to the closest subject for 'side by side' display,or just 1/60th if the image is to be also used for color anaglyph or anachrome image display.For example,if you are taking a photo of a person in front of a house,and the person is thirty feet away,then you should move the camera 1 foot between shots
The stereo effect is not significantly diminished by slight pan or rotation between images.In fact slight rotation inwards (also called 'toe in') can be beneficial.Bear in mind that both images should show the same objects in the scene (just from different angles) - if a tree is on the edge of one image but out of view in the other image,then it will appear in a ghostly,semi-transparent way to the viewer,which is distracting and uncomfortable.Therefore,you can either crop the images so they completely overlap,or you can 'toe-in' the cameras so that the images completely overlap without having to discard any of the images.However,be a little cautious - too much 'toe-in' can cause eye strain for reasons best described here.

如果一样物体在视野内移动,则需要同时拍下两张图像.可以通过专门的双镜头照相机或是两台一模一样的相机,但必须尽量在同一时刻拍摄.
如果物体保持完全静止（比如在博物馆展览中的物体）,单独的数码相机也可以派上用场.这时需要两次曝光.照相机可以在一个滑杆上移动,如果摄像师操作熟练的话也可以仅仅手持摄像机水平笔直地移动.这种拍摄立体照片的方法有时被称为“cha-cha”或者“rock and roll”.
一个“并列显示（side by side display）”的使用规则是向侧面移动距离的1/30,或者只移动1/60如果照片是用于色彩分析或是三维图像展示.例如,当你拍摄一个站在房子前的人而且那个人在三十英尺远,那么你就应该在两次闪光之间移动照相机一英尺.
立体效果并不会因为轻微的镜头摇动或是图像旋转而大大减弱.事实上,图像向中心旋转一点会更好.记住两张图像拍的都是同一场景下的同一物体（只不过角度不同）.如果一棵树是在一幅图像的边缘但是在另一张图像中超出边界了,这棵树就会以一种可怕的、半透明的样子呈现给观者,这样会分散观众的注意力并且让人很不舒服.因此,你可以裁剪图像使它们完全重叠或者如上所述的向中心旋转照相机,然后图像就可以完全重叠同时又不会浪费其他的图像.然而,要注意,如果旋转太多就会让眼睛疲劳.
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