isempty

Determine if points object is empty

Syntax

isempty(points)

Description

isempty(points) returns a true value, if the points object is empty.

Examples

Check If Points Object Is Empty

Read an image.

I = imread('cameraman.tif');

Detect KAZE points from the image.

points = detectKAZEFeatures(I);

Check for points.

if isempty(points)
    return;
end

Extract KAZE features from the detected points.

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

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

imshow(I)
hold on
strongestPoints = selectStrongest(validPoints,10);
plot(strongestPoints,'showOrientation',true)
hold off

Input Arguments

points — Points object

point feature object

Points object,specified as one of the point feature objects described in Point Feature Types. The object contains information about the feature points detected in the input image. To obtain points, use the appropriate detect function that pairs with the point feature type.

Version History

Introduced in R2017b