This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English version of the page.

Note: This page has been translated by MathWorks. Click here to see
To view all translated materials including this page, select Country from the country navigator on the bottom of this page.


Number of stored points





length(points) returns the number of stored points in the points object.


collapse all

Read an image.

I = imread('cameraman.tif');

Detect KAZE points from the image.

points = detectKAZEFeatures(I);

Find number of stored points.

numPoints = length(points)
numPoints = 702

Extract KAZE features from the detected points.

[features,validPoints] = extractFeatures(I,points);

Plot the ten strongest valid extracted points and show their orientations.

hold on
strongestPoints = selectStrongest(validPoints,10);
hold off

Input Arguments

collapse all

Points object, specified as a points object. The object contains information about the feature points detected in the input image. To obtain points, use the appropriate detect function.

Introduced in R2017b