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In this tutorial, you will use the new BCC Motion Key filter to successfully remove a moving foreground object from a clip. In this particular case, the moving object that you want to remove is the silver car.
Click the following links to download the media necessary for
this tutorial.
(Clips provided courtesy of Artbeats.)
• remove_auto_before.mov
• remove_auto_after.mov
1. Import the clip DSF110.mov into a bin. Splice DSF110.mov into the Avid timeline.
2. Play the clip. It is a locked down shot with a silver car passing through an intersection. You will remove the silver car from this clip.
3. Choose Effect Palette from the Tools menu.
4. Click to select the BCC Keys & Matte effect category on the left. Drag the icon for the BCC Motion Key effect onto the DSF110.mov clip.
5. Enter Effects mode.
6. The Mode menu defaults to Setup Region, which allows you to define a region or shape that contains the moving object to remove. In this case you want to remove the silver car so the car should always remain within the region box. To achieve this, you have to keyframe the position of the region box.
7. Press the Area Selection menu and choose Rectangle.
8. Adjust the Area Scale and the Area Aspect controls to position the rectangle at the start of the clip so that it encompasses the car that you want to remove.
9. Add a new keyframe by clicking the Add Keyframe icon in the timeline.
10. Move a few frames forward, add a new keyframe and reposition the rectangle so that it surrounds the car.
11. Continue to follow this method of moving forward a few frames, adding a keyframe and repositioning the rectangle until you have completed the entire clip.
12. Set the Area Selection menu to Show Mask. The colors that display in the mask region let you determine the filter's confidence of removing the object. A clear area means that the filter cannot remove the object. Red areas will be successfully removed. Blue areas indicate a good chance of removing most pixels (but not as good as red areas). Increasing Replacement Range can sometimes provide a better result depending on the speed of the moving object and the number of frames in the clip.
13. To view the final result, set the Area Selection menu to remove foreground. The filter needs to process the clip, which can be fairly render intensive. No onscreen controls indicate that this is happening.
14. When the filter finishes processing the image, scrub the timeline
to ensure that the foreground object has been removed to your satisfaction.
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