Fixing lens distortions

Lens distortions are a major obstacle in making large-format lenticular pictures. These distortions can be fixed by warping the interlaced image according to the lens distortions. The fixing procedure is comprised from two steps:

1. Measurement of the lens distortions,

2. Warping the interlaced image according to the lens distortions.

The lens distortions can be measured in several ways. I use a pattern created from a sequence of uniformly colored images. Here is a photograph of such pattern with distorted lens:

Distortion pattern

In this picture I have used a 25lpi lens of size 100x100cm. The sequence had 5 images, in colors R, G, B, W, and K. All five colors can be seen in the picture, so the lens, as is, is unusable.

The distortion of the lens can be measured from this pattern, and the interlaced image can be warped to compensate for these distortions. Here is the same scenario with the interlaced image warped to compensate for the distortions:

Same pattern with a fixing warp applied

It can be seen that all distortions disappeared. A photograph of final picture with the corrective warping applied is shown below:


The final 1mx1m picture with the corrective warp applied

This procedure allows making large-format lenticular pictures regardless of the lens distortion.

Some earlier research on this subject in the context of electronic lenticular displays is cited in the bibliography below.

Bibliography

Yun-Gu Lee and Jong Beom Ra, "Reduction of the distortion due to non-ideal lens alignment in lenticular 3D displays," SPIE vol. 5664, p. 506 (2005).

Silvio Jurk et al., "Correction of misalignments between optical grid and pixel panel on autostereoscopic displays at future increasing display resolution," Electronic Displays Conference paper (2016).

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