Hello,https://docs.opencv.org/4.5.4/db/d58/group__calib3d__fisheye.html
This is the formula about distorted point coordinates conversion into pixel coordinates:
\begin{align*}
x' &= (\theta_d / r) a ~~~ & ~~~ (1) \\
y' &= (\theta_d / r) b ~~~ & ~~~ (2) \\
u &= f_x (x' + \alpha y') + c_x ~~~ & ~~~ (3) \\
v &= f_y y' + c_y ~~~ & ~~~ (4) \\
\end{align*}
I found the source code in link below:
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And this how the source code programed:
double scale = (r == 0) ? 1.0 : theta_d / r;
u = f[0]*x*scale + c[0];
v = f[1]*y*scale + c[1];
My question is:
Thank you!
several places in the module’s documentation mention “alpha” and describe it as a “skew coefficient”. I suspect that you can set it to zero. that’s the best I can find.
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