Distortion Correction#

Distortion Correction 功能会自动校正图像中的光学失真。

失真是光学像差的一种形式，它会导致几何成像误差，即图像中的直线看起来不直。

该功能的使用#

运作原理#

所有 Basler blaze 相机均在 Basler 工厂进行校准。校准包括 DistortionCorrection 参数。启用后，此特征会自动消除任何失真效果。此特征使用 Brown-Conrady 模型的失真系数，可以校正径向和切向失真。

通常，应该始终启用校正。如果禁用，则不会执行自动失真校正，并且深度图和强度图像具有失真误差，会对测量精度产生负面影响。

Depending on the camera model, different mapping functions are used for the correction.

The blaze-101 and blaze-102 use the distortion coefficients of the Brown-Conrady model. The radial distortions are corrected using the following two coefficients:

x_d = (1 + k₁r² + k₂r⁴) * x_u

where r is the distance to the principal point

For the blaze-112, the general camera model for wide-angle and fisheye lenses is used. Four coefficients are used here. These are sufficient to map the projection curves with acceptable accuracy.

r(θ) = θ + k₁θ³ + k₂θ⁵ + k₃θ⁷ + k₄θ⁹

The distortion coefficients are specific to each camera and can be read out via the Scan3dDistortionCoefficientSelector and Scan3dDistortionCoefficientValue parameters if distortion correction is disabled.

禁用 Distortion Correction#

如果您更喜欢自己校正失真效果，请禁用 DistortionCorrection 参数。

pylon blaze 补充软件包随附的 Distortion Correction 示例解释了此过程并告诉您如何计算已更正的点云。