<div dir="ltr">On Tue, Aug 13, 2013 at 12:36 AM, Sergey Sharybin <span dir="ltr"><<a href="mailto:sergey.vfx@gmail.com" target="_blank" onclick="window.open('https://mail.google.com/mail/?view=cm&tf=1&to=sergey.vfx@gmail.com&cc=&bcc=&su=&body=','_blank');return false;">sergey.vfx@gmail.com</a>></span> wrote:<br>
<div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">
<div>I do not happy with calling it "corner pin" because it's not corner pin at all. You could (and probably even should) use more than 4 point tracks to make plane estimation much more accurate. Also, point tracks have no relation with corners at all: you could track points which are not corners of your plane (we showed this in our video).</div>
</div></blockquote><div><br></div><div>The feature you are calling "plane track" appears *exactly* like corner pinning in Mocha and After Effects. The "corners" referred to in the name "corner track" or "corner perspective pin" are the corners of your "plane" not the trackers themselves.</div>
<div><br></div><div><div><a href="http://www.youtube.com/watch?v=xRpHgVFPqqk&feature=player_detailpage&t=465">http://www.youtube.com/watch?v=xRpHgVFPqqk&feature=player_detailpage&t=465</a></div><div><a href="http://www.youtube.com/watch?v=fY4wwZFD5-c">http://www.youtube.com/watch?v=fY4wwZFD5-c</a><br>
</div></div><div><br></div><div>The reason it's not called planar-tracking is that it's not 3d, it's a 2d affine image transformation.</div><div><br></div><div>Why do you call it a "plane"? As far as I can see, it's not a 3d-plane, but a 2d-affine compositing surface distorted in camera-space.</div>
<div> <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div>Another usage of plane track might be constraining point tracks to belong to this plane while tracking them. Which means we might support other-way-around usecase: you create point tracks, you create plane out of them, and then starts tracking this point tracks taking plane constraint into account.<br>
</div></div></blockquote><div><br></div><div>At that point, the track would be for a 3d-plane, and it would be appropriate to call it a planar-track.</div><div><br></div></div>
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