The typical UAV camera uses a rolling shutter to record the image scan line by scan line. This can cause distortion of the image. (Be sure to watch the video at the end for a detailed explanation.)
Dr. Munjy, who I recently met at the TRB AFB80 summer meeting and his grad student Jacob Lopez have written an important paper on the rolling shutter effect inherent in all CMOS cameras. These are the cameras found on most UAVs. The rolling shutter effect becomes significant when flying the UAV fast and/or when flying at low altitudes.
The researchers studied the use of software to correct for the rolling shutter effect on a test site that had extensive ground control installed. They tested three different commercial software products, two of which claimed to remove the rolling shutter effect from the imagery. They used a number of control layouts varying from using 15 ground control points to just five.
To read the full article click here.
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In the following explanation by Destin at SmarterEveryDay he does an impressive job of visually explaining a difficult topic. Maybe that is why this video has nearly 2,500,000 views – Incredible! This is a person you might want to follow.