save the output figure as binary image

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mohammed alany 2020-2-16

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评论： mohammed alany 2020-2-17

采纳的回答： Subhadeep Koley

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i am plotting rectangle like in the code bellow,

rectangle('Position',[96 539-450 214 161], 'FaceColor',[0 .5 .5])
axis([0 559 0 539])

i want to save the output figure as binary image "in workspace" without border and exact area.

as a result the binary image must be like 559x539

any help?

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mohammed alany 2020-2-16

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Thanks dear,

but if plot without putting the axis like bellow

rectangle('Position',[96 539-450 214 161], 'FaceColor',[0 .5 .5])

How i can find the exact size of saved image

Subhadeep Koley 2020-2-16

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@ mohammed alany

Use this

[rows, cols, channels] = size(img)

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采纳的回答

Subhadeep Koley 2020-2-16

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https://ww2.mathworks.cn/matlabcentral/answers/505798-save-the-output-figure-as-binary-image#answer_415828

编辑：Subhadeep Koley 2020-2-16

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The below code will save the figure as an image in the worksapce.

clc; close all;
rectangle('Position',[0 0 539 539], 'FaceColor',[0 .5 .5],...
    'LineStyle', 'none');
axis tight; axis off;
frm = getframe(gcf);
img = frame2im(frm);
img = imresize(img, [539, 539], 'bicubic');
figure; imshow(img);

But, if you convert the image to binary (as you stated in your question) then all the color information (which you added using FaceColor) will be lost. And the image will become a black blob.