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by doe_eyes
701 days ago
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It should be noted that this article talks about a pretty niche use case without really spelling it out. Camera optics are generally designed not to exhibit this kind of distortion. As other commenters note, wide-angle lenses are ground to provide rectilinear projection where horizontal and vertical lines are straight. Further, if a particular lens does exhibit distortion, the usual solution is to measure the effect and construct a reverse mapping that can be applied in software. There are relatively few situations where you have a distorted image taken with unknown lens, but where you have a regular grid of horizontal and vertical lines for the algorithm to rely on. |
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In visual effects distortion correction is required is required before effective camera tracking can take place. It is also required for a matte to fit the footage. In such situations, it is not unknown to be given 'mystery meat' footage which requires distortion correction. You would be surprised how many directors and DOPs take VFX voodoo for granted and would rather save five minutes on set at the cost of two days in post production.