Find Xmin and Ymin to Imcrop an image in Matlab

Question

Manpreet 2015-4-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/214396-find-xmin-and-ymin-to-imcrop-an-image-in-matlab

评论： Harold Getenga 2017-12-12

I want to crop my image. Cropping of the image using coding is as follow I = imcrop(I,[xmin ymin width height]). I know the width and height of image, but I donot know how to find xmin and ymin cordinates of an image from the different pixels values of an image. sum() or any() or find() function can be used, but I donot know how to apply these functions I donot the basic concept, how xmin and ymin value are chosen from thousands of values image have.

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Guillaume 2015-4-30

What do you call xmin and ymin of an image?

Manpreet 2015-5-1

Thomas sir, I got your point. Thanks a lot.

To know these cordinates after imcrop command type data = clipboard('pastespecial'); you will get all the four values

Giving an example

S = imcrop(I); %Crop an image You can crop the image which will appear in the figure window,here afetr selecting the area to be cropped, right click the mouse and click to copy position and then type the following code. data = clipboard('pastespecial');% Four values will be stored here

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Answer 1

Thomas Koelen 2015-4-30

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https://ww2.mathworks.cn/matlabcentral/answers/214396-find-xmin-and-ymin-to-imcrop-an-image-in-matlab#answer_177260

xmin is the x coordinate of the lower left corner of the cut you want to make in the image,

ymin is the y coordinate of the lower left corner of the cut you want to make in the image,

width is the width of the cut you want to make,

height is the height of the cut you want to make.

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Harold Getenga 2017-12-12

I am more of a newbie in Matlab,but I would think since the spatial co-ordinates in Matlab are given from top-to-bottom for the y-axis, then that would make the ymin to be (at least visually) the y-co-ordinate of the top left corner of the cut you want to make.

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