返回当前帧并且不向下一帧推进。
实际上它指定了在下一帧被显示之前的帧数。
It actually specifies the number of frames before the next trailer frame is drawn.
当播放一帧视频时，下一帧很有可能是一样的。
When a single frame of video is displayed, there is a high probability the next frame is the same.
其结果是，每帧绘制在下一帧之上，造成涂片效果。
The result is that each frame is drawn over the next, resulting in a smear-looking effect.
利用块匹配的方法估计目标区域在下一帧图像中的位置；
Use block matching methods for estimating the target region in the next fr a me image position;
利用运动估计预测目标在下一帧的感兴趣区域，即跟踪窗。
Firstly the regions of interest which contained the target in the next frame, namely tracking windows, were predicted by motion estimator.
我们必须做的第一件事情是保证应用程序等待，知道下一帧准备好。
The first thing we have to do is to ensure that the application waits until the next frame is ready.
首先利用运动估计预测目标在下一帧的感兴趣区域，也就是跟踪窗。
The regions of interest which contain the target in the next frame, namely tracking windows, are predicted by motion estimator.
下一帧的大小将取决于上一帧的平均X数，而X又是由反应延迟因素决定的。
Every next frame gets altered by a value that is the average of the last X number of frames. X is determined by the RDF.
目标运动估计模块预测运动目标在下一帧中可能出现的位置，确定目标搜索范围。
The module of target motion estimating takes charge of forecasting the possible arisen location so as to confirm the scope of target searching.
每一帧的第一个双字（double word）指向下一帧，这后面紧跟着调用函数的地址。
The first double word of every frame points to the next frame and this is immediately followed by the address of the calling function.
解决这个问题的方法之一是，首先分析胶片的第一帧，然后是下一帧，接着计算这两帧的平均。
One way of doing this is to analyse first one frame of film and then the next, and calculate an average of the two.
为了提高效率，在定位出前一帧的眼睛位置后，我们只在估计的范围内搜索下一帧眼睛的可能位置。
In order to improve efficiency, eye location of the next fame is predicted according to previous ones.
然而，如果跟踪窗口太小，它可以变得很难估计的运动，从这一帧画面到下一个。
However, if the tracking window is too small, it can become difficult to estimate motion from one frame to the next.
然而，如果跟踪窗口太小，它可以变得很难估计的运动，从这一帧画面到下一个。
However, if the tracking window is too small, it can become difficult to estimate motion from one frame to the next.
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