Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 initialism Random sample consensus, an iterative method to estimate parameters of a mathematical model from a set of observed data which contains outliers.
Etymologies
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Examples

RANSAC is actually an abbreviation for "RANdom SAmple Consensus".

The full explanation of RANSAC is way beyond the scope of this article, but more information about a

So the quality of the final result may vary wildly if RANSAC parameters are not chosen wisely.

The RANSAC algorithm has found many applications in

For the problem of homography estimation, RANSAC works by trying to fit several models using some of the points pairs and then checking if the models were able to relate most of the points.

This happens because RANSAC did find an Homography matrix relating most of the points and discarded the incorrect matches as outliers.

RANSAC object with the parameters for fitting an homography matrix.

RANSAC does not require such an initial estimate does not take into account all the available data lacks precision

RansacHomographyEstimator class for estimating homography matrices using RANSAC.

After the execution of RANSAC, we can see only correct matches were left in our images.
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