detectSURFFeatures gives empty object back

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Yassine Zaafouri
Yassine Zaafouri 2016-11-3
if true
Points = detectSURFFeatures(test)
imshow(test);
hold on;
plot(selectStrongest(Points, 100))
end
I used the code bellow to extract Features of my 2-D grayscale image "test" ( double or uint16) but the function detectSURFFeatures gives me an empty object back so when i want to plot i become this error
if true
to the || and && operators must be convertible to logical scalar values.
error in vision.internal.FeaturePoints/plot (line 152)
if k==1 && ~wasHeld
error in SURFPoints/plot (line 172)
h = plot@vision.internal.FeaturePoints(this, ...
end
Any help please ?

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