creating new images using new x,y coordinates from a subplot

Question

mike 2020-12-8

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/686973-creating-new-images-using-new-x-y-coordinates-from-a-subplot

评论： mike 2020-12-9

Hi all,

I have created 4 subplots. I am able to manually zoom into each image and find the x,y coordinates using the pop up bar at the top of the image

My issue is this, I want to zoom in to a particular point, and then re-create the 4 subplots at that zoomed in position.

My code so far is-

figure;
subplot(2,2,1); imshow(EdgeS),title('Sobel');
subplot(2,2,2); imshow(EdgeP),title('Prewitt');
subplot(2,2,3); imshow(EdgeR),title('Roberts');
subplot(2,2,4); imshow(EdgeC),title('Canny');

When I click on the image, it gives me [X,Y] [123 456] (obviously not the real coordinates).

Do i need to click in all four courners, or just in one place?

so where would i add my coordinates in my code?

I hope that makes sense!!

cheers

mike

2 个评论
显示无隐藏无

Holmbrero 2020-12-8

I think what you are looking for is imcrop:

https://se.mathworks.com/help/images/ref/imcrop.html#d122e120944

Icropped = imcrop(I,rect) crops the image I according to the position and dimensions specified in the crop rectangle rect. The cropped image includes all pixels in the input image that are completely or partially enclosed by the rectangle.

The actual size of the output image does not always correspond exactly with the width and height specified by rect. For example, suppose rect is [20 20 40 30], using the default spatial coordinate system. The upper left corner of the specified rectangle is the center of the pixel with spatial (x,y) coordinates (20,20). The lower right corner of the rectangle is the center of the pixel with spatial (x,y) coordinates (60,50). The resulting output image has size 31-by-41 pixels, not 30-by-40 pixels.

KSSV 2020-12-8

You can adjust the axis by using axis, xlim, ylim.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

mike 2020-12-8

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/686973-creating-new-images-using-new-x-y-coordinates-from-a-subplot#answer_569273

thanks for the repies

so with the xlim which limit would I choose? I have zoomed into the image (all four at the same time as I have linked the axis) but I can pick any point on the image which gives me the xy value. So how would I then decide what the limits are?

many thanks

mike