How can I create 3D pixels image
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I need to create a sphere in a box of 100 pixels per side
The code to form a circle is the following
imageSizeX = 100;
imageSizeY = 100;
[columnsInImage rowsInImage] = meshgrid(1:imageSizeX, 1:imageSizeY);
% Next create the circle in the image.
centerX = 50;
centerY = 50;
radius = 25;
circlePixels = (rowsInImage - centerY).^2 + (columnsInImage - centerX).^2 <= radius.^2;
% circlePixels is a 2D "logical" array.
% Now, display it.
image(circlePixels) ;
colormap([0 0 0; 1 1 1]);
imwrite(circlePixels,'circle.bmp');
How could the previous code be modified for a sphere?
1 commentaire
Rik
le 26 Oct 2018
Today I formatted your code, next time, use the {}Code button. See here for a GIF showing how to do it.
Réponses (3)
Rik
le 26 Oct 2018
The code generating the binary mask is relatively easy to extend, but you'll have to think about the image format you want to save it in, and the way you want to show the 3D object in a Matlab figure.
imageSizeX = 100;
imageSizeY = 100;
imageSizeZ = 100;
[X,Y,Z] = ndgrid(1:imageSizeX, 1:imageSizeY, 1:imageSizeZ);
% Next create the circle in the image.
centerX = 50;
centerY = 50;
centerZ = 50;
radius = 25;
circlePixels = (Z-centerZ).^2 + (Y-centerY).^2 + (X-centerX).^2 <= radius.^2;
7 commentaires
Rik
le 27 Oct 2018
If you want to superimpose them, why split them up in the first place? You can sum them (or calculate the mean, which save you from scaling the output).
I=mean(circlePixels,3);%converts to double as well
imshow(I)
imwrite(I,'sphere.bmp');
Rik
le 30 Oct 2018
Did this suggestion solve your problem? If so, please consider marking it as accepted answer. It will make it easier for other people with the same question to find an answer. If this didn't solve your question, please comment with what problems you are still having.
tesarj13
le 26 Oct 2018
Modifié(e) : tesarj13
le 26 Oct 2018
imageSizeX = 100;
imageSizeY = 100;
imageSizeZ = 100;
[columnsInImage, rowsInImage,zInImage] =...
meshgrid(1:imageSizeX, 1:imageSizeY,1:imageSizeZ);
% Next create the circle in the image.
centerY = 50;
centerX = 50;
centerZ = 50;
radius = 25;
circlePixels = (rowsInImage - centerY).^2 + (columnsInImage - centerX).^2 +...
(zInImage - centerZ).^2 <= radius.^2;
% circlePixels is a 3D "logical" array. % Now, display it.
isosurface (circlePixels,1/2)
axis equal
0 commentaires
Image Analyst
le 30 Oct 2018
Try this:
[x,y,z] = sphere;
% Plot a sphere centered at the origin.
% Make radius 50
radius = 50;
x = radius * x;
y = radius * y;
z = radius * z;
surf(x,y,z)
grid on;
axis equal
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