How can we fetch the count of the corners detected using detectMinEigenFeatures() function?

I need to plot the graph based on the number corners detected in each frame. Is it possible to fetch the number of corners detected using the function detectMinEigenFeatures()??

points = detectMinEigenFeatures(rgb2gray(videoFrame));

Thanks in advance

Answer 1

[Image Analyst]

I don't have that function, but how about size(points)?

[athithya]

thanks a lot...it worked but I used length(points) since size(points) return the min and max value

[Image Analyst]

length() will produce the max of the sizes, in other words, it gives you the length of whatever dimension is longest. If you have 1 point and points is a 1 by 2 array, it will return 2 (probably not what you want. For more than 2 points, length() will return the same as size(m, 1) for an N by 2 array.

Answer 2

[Breezy Boo]

When you run

points = detectMinEigenFeatures(rgb2gray(videoFrame));

points have three values Location, Metric and Count. So simply execute

points.Count

and it will return number of features detected

[Sam O.]

There will be an error saying that there is no such thing as count function in matlab. I tried this code but i've got an error

[Image Analyst]

Where did you, and others, get this function detectMinEigenFeatures()?

Anyway, count is different than count since MATLAB is case sensitive. Try Count instead of count. Anyway, count would not be a function - it would be either

1. a "property" of a "class",
2. a "method" of a "class", or
3. a "field" of a structure variable.