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i want to detect intrest point from image attached using speed up robust feature (SURF)

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alaa shamasneh
alaa shamasneh on 9 Feb 2018
Edited: alaa shamasneh on 9 Feb 2018
I already using this code to detect interest point but not working can any body help , the image for lymph node I already crop from the ct image and save it as jpg
I = imread('2-imadustcontrast.png'); I = rgb2gray(I)
points = detectSURFFeatures(I); imshow(I); hold on; plot(points.selectStrongest(2));
the code give me this error whats that mean
Operands 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 173) h = plot@vision.internal.FeaturePoints(this, ...
Error in Untitled2 (line 6) plot(points.selectStrongest(2));

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