how to use crop using coordinate?

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reza hamzeh
reza hamzeh 2020-1-24
编辑： Walter Roberson 2020-1-24
hi. i want to crop the red square from this pic using coordinate. lets suppose coordinate of the top-left point of the red square is w/2 and h/2
where w and h are width and hight of the pic respectively. and width and hight of the red square are 20 pixel. this is my code but it dosent work. plz help me.
pic=imread('b.jpg');
[w, h, numberOfColorChannels] = size(pic);
I=imcrop(pic,[w*0.5 h*0.5 20 20]);
imshow(I)
black.jpg
  2 个评论
Spencer Chen
Spencer Chen 2020-1-24
Would be great if you describe what did not work.
Rik
Rik 2020-1-24
Also, it is probably a good idea to round your coordinates to integers.

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采纳的回答

Walter Roberson
Walter Roberson 2020-1-24
编辑：Walter Roberson 2020-1-24
You need
[h, w, numberOfColorChannels] = size(pic);
not
[w, h, numberOfColorChannels] = size(pic);

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