Mitigating Perspective Distortion-induced Shape Ambiguity in Image Crops
Aditya Prakash Arjun Gupta Saurabh Gupta
Objects undergo varying amounts of perspective distortion as they move across
a camera's field of view. Models for predicting 3D from a single image often
work with crops around the object of interest and ignore the location of the
object in the camera's field of view. We note that ignoring this location
information further exaggerates the inherent ambiguity in making 3D inferences
from 2D images and can prevent models from even fitting to the training data.
To mitigate this ambiguity, we propose Intrinsics-Aware Positional Encoding
(KPE), which incorporates information about the location of crops in the image
and camera intrinsics. Experiments on three popular 3D-from-a-single-image
benchmarks: depth prediction on NYU, 3D object detection on KITTI & nuScenes,
and predicting 3D shapes of articulated objects on ARCTIC, show the benefits of
KPE.