Undefined function or variable 'detectORBFeatures'

2021 3 29
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更新时间：2021 3 29
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While running the example program from https://www.mathworks.com/help/vision/ref/detectorbfeatures.html
I=imread('ncp.png');
%I = im2gray(I);
points = detectORBFeatures(I);
figure
imshow(I)
hold on
plot(points,'ShowScale',false)
hold off
error coming as,
Undefined function or variable 'detectORBFeatures'.
Error in orb_test (line 8)
points = detectORBFeatures(I);

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