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A new feature called Upright examines the horizontal and vertical lines of a photo to correct for lens distortion.
A final remark concerns lens distortion.
Eq. (12) considers the radial lens distortion.
Therefore, Eq. (19) considers both the tangential lens distortion and the radial lens distortion like the LUT method.
In conclusion, the lens distortion models typically improved the accuracy.
The figure shows that the height model of the third-order function can resolve the tangential lens distortion as well as the radial lens distortion.
Fig. 3 Modeling errors by LSM without considering lens distortion Fig. 4 Modeling errors by LSM with considering radial lens distortion.
If lens distortion is ignored, H is constant, regardless of the camera coordinates as shown in Eq. (3), but it may change if lens distortion is considered.
Usually, the lens distortion consists of radial symmetric distortion, decentering distortion, affinity distortion, and nonorthogonally deformations.
However, Figure 21 present an image before and after our lens distortion correction.
In addition, future research should introduce lens distortion parameters to a simplified camera model.
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