追踪

跟踪运动

The Track Motion menu is used to perform tracking of selected tracks (i.e. following the selected feature from frame to frame).

此操作符取决于“跟踪设置”面板中的设置。如果在序列跟踪过程中，算法无法跟踪某些标记，则将禁用这些标记，并继续跟踪其余标记。如果逐帧跟踪时算法失败，则不会禁用标记，并使用特征点在下一帧上最可能的位置。

参考

模式

跟踪

菜单

Track ‣ Track Motion ‣ Backwards

快捷键

Shift-Ctrl-T

Tracks the motion backward along the sequence.

帧逆序

参考

模式

跟踪

菜单

Track ‣ Track Motion ‣ Frame Backwards

快捷键

Alt-Left

Tracks the motion backward by one frame.

前进

参考

模式

跟踪

菜单

Track ‣ Track Motion ‣ Forwards

快捷键

Ctrl-T

Tracks the motion forward along the whole sequence.

帧正序

参考

模式

跟踪

菜单

Track ‣ Track Motion ‣ Frame Forwards

快捷键

Alt-Right

Tracks the motion forward one frame.

清空

参考

模式

跟踪

菜单

Track ‣ Clear ‣ Before

快捷键

Shift-T

删除所选轨道的当前帧所有的跟踪和关键帧标记。

清除活动项

将清除操作仅限于活动跟踪点I(与所有选定的相反)。

后显帧数

参考

模式

跟踪

菜单

Track ‣ Clear ‣ After

快捷键

Alt-T

此项将删除当前帧之前的所有轨迹中的所有被追踪的、设置了关键帧的标记点。

清除活动项

将清除操作仅限于活动跟踪点I(与所有选定的相反)。

轨迹路径

参考

模式

跟踪

菜单

Track ‣ Clear ‣ Track Path

快捷键

Shift-Alt-T

此项将清除所有选中的轨迹中除当前帧之外的所有标记点。

将清除操作仅限于活动跟踪点I(与所有选定的相反)。

清空解算

待补充。

改善

此操作将为所有选定的标记运行从上一个关键帧到当前帧的跟踪器。当前标记位置正在考虑初始位置猜测，其可以由跟踪器更新以获得更好的匹配。

在功能从帧中消失然后再次出现的情况下很有用。在这种情况下的用法如下：

当特征点重新出现在帧上时，手动在其上放置标记。
Use Refine Markers operation to allow tracker to find a better match.

Depending on direction of tracking use either Forwards or Backwards refining. Accordingly if tracking happens forwards, use Refine Forwards, otherwise use Refine Backwards.

参考

模式

跟踪

菜单

Track ‣ Refine ‣ Backwards

Refine the track backwards.

前进

参考

模式

跟踪

菜单

Track ‣ Refine ‣ Forwards

Refine the track forwards.

添加标记

参考

模式

跟踪

菜单

Track ‣ Add Marker

Places a new marker at the position of the mouse (which is under the button in this case, not ideal but it is just how things work) and then it can be moved to the needed location. When it is moved to the desired position, LMB can be used to finish placing the new marker. Also, Return and Spacebar can be used to finish placing the marker. But it is faster to use Ctrl-LMB to place markers directly on the footage. This shortcut will place the marker in the place you have clicked.

In addition to this until you have released the mouse button, you can adjust the marker position by moving the mouse and using the track preview widget to control how accurately the marker is placed.

参考

模式

跟踪

菜单

Track ‣ Detect Features

Detects all possible features on the current frame and places markers at these features. This operator does not take other frames into account, so it might place markers on features which belong to moving objects. If the camera is turning away from this shot, no markers could be present within the frames after the camera moved away.

这个操作有几个属性：

放置

在整帧范围内投放标记

整帧

在整帧范围内投放标记

标注区域内部

Places markers inside the area outlined with the Annotation Tools. This can be used to outline some areas with interesting features and place markers only inside the outlined area.

标注区域外部

Places markers outside the area outlined with the . This can be used to outline areas of no interest (like trees, humans, etc.) and place markers outside of these areas.

边距

控制从所创建的标记的图像边界的距离。如果标记放置过于靠近图像边界，它们将无法真正快速跟踪和他们应该被手动删除。降低人工清理的量，可使用该参数。

阈值

限制放置标记的最小阈值。这个值来自特征检测算法，基本上它意味着：低值意味着很可能这个特征很快就不能跟踪，高值意味着它没有太多这样的跟踪。用这个值可以控制要添加的标记的数量。

距离

定义放置的标记之间的最小距离。需要防止标记彼此靠得太近（这样的位置会使相机解算器混淆）。

创建平面追踪

参考

模式

跟踪

菜单

Track ‣ Create Plane Track

The Create Plane Track operator creates a new plane track. Planar tracking takes advantage of the fact that there are often planar surfaces in footage, by attaching markers to points on these flat planes. It can be used to replace things like billboards and screens on the footage with another image or video. It also might be used for masking.

This button will create a plane object which is deforming in the same way as plane defined by all selected point tracks. At least four feature points tracked across the footage which belongs to the plane you want to replace are needed. More tracks will give better estimation of plane motion.

Feature points used to estimate plane motion could be used from any place on the plane, meaning it’s not necessarily need to be corners. Corners are not always easy to be tracked, they might be occluded. In this case you can position tracked features that lay on the same plane far away from the actual plane which should be replaced.

This provides more information about the possible deformation of the marker in following frames, and such markers can be tracked even if partially occluded (appear and disappear during the time). It is only required that two neighbor frames have at least four common tracks.

An image can be projected onto the plane with the compositing node.

Solve Solution

参考

模式

跟踪

菜单

Track ‣ Solve Solution

There should be at least eight common tracks on the both of the selected keyframes.
There should be noticeable parallax effects between these two keyframes.

If everything goes smoothly during the solve, the average reprojection error is reported to the information space and to the Clip editor header. Reprojection error means the average distance between reconstructed 3D position of tracks projected back to footage and original position of tracks. Basically, reprojection error below 0.3 means accurate reprojection, (0.3 - 3.0) means quite nice solving which still can be used. Values above 3 means some tracks should be tracked more accurately, or that values for focal length or distortion coefficients were set incorrectly.

合并轨迹

参考

模式

跟踪

菜单

Track ‣ Join Tracks

快捷键

Ctrl-J

此操作将所有选定的跟踪路径合并为一个。选定的合并跟踪路径不应在同一帧上具有公共的跟踪标记或关键帧标记。

平均轨迹

参考

模式

跟踪

菜单

Track ‣ Average Tracks

The Average Tracks operator creates a new tracking marker by averaging the data from the selected tracks. This can be used to improve stability of tracking on blurry or non-very-sharp feature shapes. The operator takes into account all however, disabled markers do not affect the averaging.

Gaps in the original tracks will be linearly interpolated, to reduce result track jump. Note that this only applies to gaps “in between”. This means that if a track does not have markers in the beginning or end of it, there is nothing to interpolate with and the resulting track will jump.

保留原件

When enabled, the selected tracks are not deleted.

待补充。

粘贴轨道

待补充。

动画

待补充。

显示/隐藏

待补充。

清理

清理轨迹

参考

模式

跟踪

菜单

Track ‣ Clean Up ‣ Clean Tracks

Identifies all tracks which matches settings from above and performs desired action on them.

被追踪帧

Tracks or tracked segments shorter than this number of frames will be removed.

二次投射误差

Tracks which has reprojection error higher than this value will be removed.

动作

Several actions can be performed for bad tracks.

选择

They can simply be selected.

删除轨道

The whole track can be deleted.

删除片段

Bad segments of tracked sequence can be removed.

过滤追踪轨

参考

模式

跟踪

菜单

Track ‣ Clean Up ‣ Filter Tracks

This operator deletes obviously bad tracks (for example, the ones which are too short). Additionally, it identifies tracks which has suspicious spikes in their motion and selects them.

参考

模式

跟踪

菜单

Track ‣ Delete Track

快捷键

删除选择的所有跟踪点

删除标记

参考

模式

跟踪

菜单

Track ‣ Delete Marker

快捷键

待补充。