Hi,
I have been looking at ROS calibration recently, and I came across the term "rectification" being used
for single images ( see [ROS image_proc](http://wiki.ros.org/image_proc) and [ROS image_geometry API for single camera](http://docs.ros.org/api/image_geometry/html/c++/classimage__geometry_1_1PinholeCameraModel.html#a3cb983f84f1993287247781a6bda39c2)).
**My question:**
From my understanding, the term rectification is used for stereo cameras/images. What does it mean for single cameras ? Is it the same is **un**-distortion of an image ?
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