How to swap a recurring prop for something else everywhere it appears
Upload the video and the image that replaces the prop. Vizard Agent cuts the replacement out with a clean transparent edge, verifies that transparency against a checkerboard, measures where the original prop sits through the whole clip, checks the tracking second by second, and composites the swap.
What do you type into Vizard Agent?
Say "replaced" rather than "covered". Vizard Agent treats them differently: covering pastes the new asset over the old one and leaves its edges showing, while replacing removes the original and puts the new asset in its place. Supply the replacement image on any background, ideally a plain one, because Vizard Agent cuts it out itself.
Prompt
What does Vizard Agent actually do?
Replacing one object throughout a video is two problems: making a clean cutout of the new thing, and knowing where the old thing is in every frame. A cutout that looks clean on white can carry a pale halo from its old background that only shows on something dark, so the transparency gets checked before compositing. In the session behind this article it:
- Inspected the attached character image, sampled the timing of a two-minute clip, and reviewed the sampled scenes to see where the prop appeared.
- Checked the analysis and cutout capabilities available, then created detailed reference frames and a visual overview of every appearance.
- Created a transparent cutout of the replacement, refined it against its green background and verified the result.
- Checked the transparency on a neutral background, then viewed the cutout on a checkerboard.
- Measured the original prop's position through the footage, reviewed representative frames for tracking accuracy and inspected the detected bounds at one-second intervals.
When does this not work well?
Swapping an object everywhere depends on the original being findable in every frame and on the space behind it being reconstructable. An object passing behind something is lost to tracking, fast movement smears the edge, and two similar objects can confuse the detection. Here the footage, not Vizard Agent, sets the limit.
Common questions
Does the original really disappear? Yes, if you ask for replacement rather than covering. Vizard Agent removes it and rebuilds behind.
Will the replacement move like the original? Yes. Vizard Agent measures the original's position through the clip and follows it.
What if the object is partly hidden? Occlusion is the hard case here. Vizard Agent reports where the tracking loses the object.