error in cropping image

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2013 2 14

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更新时间：2021 8 20

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I have two images http://imgur.com/JHsjJkA,0GgHtBn#1

I have detected surf features, when i try to imcrop the surf detected region, the cropped image does not have that surf point.

plz assist where i made wrong

i need the crooped image with surf points

clc
  clear all
  close all
  [p,f]=uigetfile();
  I=imread(strcat(f,p));
  I1=rgb2gray(I);
  points = detectSURFFeatures(I1);
  imshow(I); hold on;
  plot(points.selectStrongest(10))
  S=imcrop((plot(points.selectStrongest(10))));
  figure,imshow(S)