Perspective Corner Pin [Invert] - Tracking

Question

Basically what you can do with Perspective Corner Pin mode in Tracking is, say, you're recording handheld, and you have a TV on your video, you want to replace the screen of the TV with a footage, like this video:

Adobe After Effects Tutorial: Perspective Corner Pin Motion Tracking - YouTube

But what I need is different, I've shot a video of a TV, again, the camera is moving around, I want to change the perspective so that the content of the TV is shown without an angle.

It's hard for me to explain so I'll show you with pictures.

I want to turn this:

Into this:

And I did this easily with Photoshop using Select Tool -> draw a selection around the TV then using Move Tool -> Show Transform Controls -> hold Ctrl key and move around the corner points of the selection to the corners of the image. But how do I do this in After Effects?

Thank you.

Mike_Abbott · Accepted Answer

What you want is 'reverse corner pinning'.

Find and apply the "CC Power Pin" effect.

In the Effects Controls panel click the fx icon to TURN OFF the effect - wierd, I know.

Then drag the 4 effects points onto the related 4 corners your TV.

Tick the 'unstretch' box and click the fx flag to enable the effect.

- so that should do what you want on a still frame. For a moving camera it's likely you will first need to stabilise the object to apply the above technique across the multiple frames of a video clip.

14starsabove · Answer

After some long hours of tracking, I applied the Motion Tracker to a new Solid Layer, which created Corner Pin effect with key-frames and Position key-frames. Then on the video footage I added a CC Power Pin effect and copied all the corresponding Corner Pin properties to the CC Power Pin properties. I also copied the Position property key-frames. BUT the end result was pretty bad.. (I still have no idea why)

So here's what I did, instead of applying the Motion Tracker, I copied the key-frames of a property called "Attach Point" on each Track Point to the corresponding property of the CC Power Pin effect and the result is pretty good

That means Track Point 1 was copied to Top Left because I set the Track Point 1 to track the top left corner of the smartphone screen.

And so on and so forth

I also tried the property "Feature Center" but the result wasn't that great, I'll stick to "Attach Point"

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