I am doing a project on calibrating stereo ZED camera and finding its accuracy and compare with the Manufacturer's accuracy of 1% at 1m depth accuracy. For this purpose , the formula to calculate the depth accuracy is $dz = (z^2 * de) / (f * b)$ but how do we calculate $z$ , $de$ and $f$. Is is taken from matlab stereo-callibration app which gives 'Stereoparameter' ?
$dz$ is the depth error in meters, $z$ is the depth in meters, $de$ is the disparity error in pixels, $f$ is the focal length of the camera in pixels and $b$ is the camera baseline in meters.