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Stitch images by Translation

I am currently using OpenCV stitcher class to stitch two images acquired by a camera translated parallel to a wall. The distance between the wall and the camera is around 75 cm with a limited field of view (around 70 degrees). I am using the Stitch() function to stitch such images and it works well for most of the cases. The camera is moved manually thus there may be also some rotations in the process. I know that these are taken into consideration by OpenCV in bundle Adjustment but what about the Translation ? Is the stitching working because the scene is planar therefore no parallax is involved? Has anyone worked with OpenCV Stitcher to stitch images from a translating camera ?