How to limit ORB features?

Hi there, I'm using the new ORB feature detector function (https://www.mathworks.com/help/vision/ref/detectorbfeatures.html) and was wondering if there is a way to limit the number of detected features?

[Qu Cao]

You can probably use selectStrongest to select a fixed number of ORBPoints:

https://www.mathworks.com/help/vision/ref/kazepoints.selectstrongest.html

[Helia Sh]

Thanks Qu Cao. It says that selectStrongest returns N number of points that have the strongest metrics. What are those metrics? How does it decide if the feature is stronger than a latter? Are there reading material on this feature?

Answer 1

[Qu Cao]

Hi Helia, the selectStrongest function picks the points based on the Metric values:

https://www.mathworks.com/help/vision/ref/orbpoints.html#mw_1b2cda3a-8ca4-46be-80be-eb35d874e337

For more information, you can take a look at the reference to see how the Matric is defined:

https://www.mathworks.com/help/vision/ref/orbpoints.html#References