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Autopano Video - Tutorials - Stitching two back-to-back cameras

Introduction

In this tutorial, we will explain how to create a full sphere video from two back-to-back fisheye cameras, with very little overlap.



Hardware used for this tutorial

For this tutorial, we simply stuck 2 modified GoPro Hero 3 with a 189° lens together using adhesive tape.



Lens calibation in Autopano

This setup does not offer enough overlap to calibrate the cameras directly from the stitch, so it has to be done separately.
To calibrate the lens you need to take a video in which you perform a rotation around the camera nodal point. Then, extract a few frames from this video and stitch them in Autopano.


Calibration frames

Stitching calibration frames

Save the calibration values (Fov, K1, K2 and K3), we will use them to stitch the videos.



Stitching the video in Autopano Video

In Autopano Video, drag and drop your two videos, synchronize them and hit the "Stitch as GoPro" button. The overlap is too small for the videos to be stitched automatically.

FirstStitchBackToBack.png


Hit the "Edit" button and switch to Autopano. Manually edit the calibration values: Fov, K1, K2 and K3.

CalibInjected2.png


Now, edit the cameras orientations. Here we set both roll to 90° and one yaw at 180° to make the cameras back-to-back. Alternatively, you can let Autopano estimate the cameras orientations by manually adding at least 2 control points and running a "Quick optimization" with Focal, Distortion and Offset set on "Keep current value".
CalibInjectedYawRoll.png DualFEOptimKeep.png


Save the .pano and go back to Autopano Video.

DualInAVP.png











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