Draw a circle inside a black image

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Maha Almuaikel
Maha Almuaikel 2022-3-6
评论： Maha Almuaikel 2022-3-6
I want to draw a circle in this 500x500 black matrix, but it deos not appear idk
here is the code
E = zeros(500,500);
E2 = insertShape(E, 'Circle',[250 250 100], ...
'Color','white', 'LineWidth',5);
figure(5),imshow(uint8(E2));

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采纳的回答

Voss
Voss 2022-3-6
Ran in:
E = zeros(500,500);
E2 = insertShape(E, 'Circle',[250 250 100], ...
'Color','white', 'LineWidth',5);
figure(5);
% imshow(uint8(255*E2));
% or:
imshow(E2);
  4 个评论
显示 2更早的评论
Image Analyst
Image Analyst 2022-3-6
Ran in:
Do you need double? You just cast the whole thing to double at the end, so why didn't you like my solution where I just start out with the matrix being double right from the start, thus avoiding the need to cast it to double?
Or you can leave it as double - don't cast to uint8 - and it works fine:
E = zeros(500,500);
E2 = insertShape(E, 'Circle',[250 250 100], ...
'Color','white', 'LineWidth',5);
figure(5),imshow(E2);

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更多回答（1 个）

Image Analyst
Image Analyst 2022-3-6
Ran in:
Try this:
E = zeros(500,500, 'uint8'); % Make image as uint8 right from the beginning.
E2 = insertShape(E, 'Circle', [250 250 100], ...
'Color','white', 'LineWidth',5);
imshow(E2, []); % Display it with [] to expand the contrast.

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