Hi all! Got a serious problem with distortion here. I have a 2.35 footage (=> pixel aspect ratio of 2.0), and I need to undistort the images for a matchmoving process on SynthEyes. I therefore use NukeX and its LensDistortion plugin. The issue is, whatever the undistort method we use (Image analysis, Grid analysis, Line analysis or even STmaps), there remains some sort of distortion on the lateral edges of the image. Curved lines of the original footage are indeed corrected, they're now horizontal or vertical, but the more you reach the left or right side of the image, the more this image is stretched horizontally. You can clearly see this if you put a 2D tracker on a feature and stabilize the image around it: when for example the tracker moves to the left, the image appears to stretch horizontally till it reaches the extreme left border of the image.
I then tried something else: I activated the distortion autocalculation in SynthEyes. Thanks to this, the whole shot was solved perfectly. SynthEyes found an extra distortion value and corrected it. My question is: how is it possible that SynthEyes finds this extra distortion value and NukeX not? I'd like to find a way to calculate the distortion in Nuke itself, because we later need to re-distort the 3D images to match the live footage, and we therefore need to re-use the same value that allowed us to undistort; as a result, I don't want to use both softwares to manage distortion issues. Does this come from the aspect ratio of the image? (this is the first time I work on such an image format). Or am I doing something wrong? As I mentionned it, whatever the method I use in the LensDistortion plugin, it gives me the same wrong result... Thanks!
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