MATLAB: Undefined function or variable

Question

that is the whole code which should get face detection with distance

 load('callast.mat');
 double faceDetector();
 vid = videoinput('macvideo', 1, 'YCbCr422_1280x960');%left
 vid2 = videoinput('macvideo', 3, 'YCbCr422_1280x960');%right
 triggerconfig([vid vid2],'manual');
 vid2.FramesPerTrigger = 10;
 vid.FramesPerTrigger = 10;
start([vid vid2]);
pause(1)
 trigger([vid vid2]);
 I1 = getsnapshot(vid);
 I2 = getsnapshot(vid2);
 % I1 = undistortImage(T1,stereoParams.CameraParameters1);
%I2 = undistortImage(T2,stereoParams.CameraParameters2);
 faceDetector = vision.CascadeObjectDetector;
 face1 = faceDetector(I1);
 face2 = faceDetector(I2);
 center1 = face1(1:2) + face1(3:4)/2;
 center2 = face2(1:2) + face2(3:4)/2;
 point3d = triangulate(center1, center2, stereoParams);
 distanceInMeters = norm(point3d)/1000;
 distanceAsString = sprintf('%0.2f meters', distanceInMeters);
 I1 = insertObjectAnnotation(I1,'rectangle',face1,distanceAsString,'FontSize',18);
 I2 = insertObjectAnnotation(I2,'rectangle',face2, distanceAsString,'FontSize',18);
 I1 = insertShape(I1,'FilledRectangle',face1);
 I2 = insertShape(I2,'FilledRectangle',face2);
 imshowpair(I1, I2, 'montage');

the error

 Undefined function or variable 'stereoParams'.
 point3d = triangulate(center1, center2, stereoParams);

Answer 1

You did not call estimateCameraParameters to generate the stereo parameters.