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Tuesday 30 October 2012

Visual Effects - Matchmoving #01


For this Visual Effects Assignment, I plan to do all of my 3D Camera/Object Tracking in Boujou 5.0
Above are a few reference screen shots to aid my explanations, as well as to jog my memory for future endeavors   
The 'Boujou Toolbox' (fig.1) is located on the left hand side of the Boujou interface when first opening the program, this contains a lot of the tools necessary to complete a tracking task. New buttons can be added to the toolbox simply by clicking the right mouse button and selecting the feature you want from the menu that appears.
One of the first steps to undertake when tracking is to assess the lens distortion of your footage (fig.2). This removes possible anomalies from your track and makes for a much easier time when adding scene geometry later in  process. it can also provide better results than tracking a distorted piece of footage.
In (fig.3) it is necessary to turn on 'Radial' in the 'Overlays' tab so that the corrected footage is seen in the view-port.
After the distortion is corrected, you are then ready to track the features of the image sequence (fig.4). initially you may want to adjust the amount of points you track to reduce the tracking time, the more detail you put into the points, the longer the tracking process will take.
In (fig.5) you can see the result of tracking the features on a 2D plane. the automatic tracker generally does a good job of tracking the key features of high contrast. However it can miss some points which you may want to include. if this is the case then you can track them manually using 'Locators' and 'Target Tracks'. (Coming up in 3D Tracking #02)
If there are sections that you do not want to be tracked, such as moving shadows, or objects/people moving through your scene you may also want to mask out that section using the 'Add Poly Mask' tool.

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