Fit Ellipse to structure in image

5 次查看（过去 30 天）
Vivek
Vivek 2025-3-27
回答： Image Analyst 2025-3-28
I have an image and a reference with many structures similar to below and I want to fit an ellipse on each strcuture such as the one below (in a single image). Once I have a ellipese on all of them , I want to use the ellipse on the difference image (image - reference) and do some computations. How can this segmentation be done in matlab.
Below is a sample image taken from
https://blogs.mathworks.com/steve/2006/06/02/cell-segmentation/

请先登录，再回答此问题。

回答（2 个）

Matt J
Matt J 2025-3-27
编辑：Matt J 2025-3-28
Ran in:
I recommend downloading this,
https://www.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-tools-to-fit-plot-conics-and-quadrics
IM=im2gray(imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1830257/image.png'));
BW=imbinarize(IM);
B=bwboundaries(BW,CoordinateOrder="xy");
fitobj=ellipticalFit(B{1}')
fitobj =
ellipticalFit with properties: center: [143.6913 104.6159] a: 58.7019 b: 49.6830 angle: 65.6680
imshow(IM);hold on
plot(fitobj); hold off
●
  1 个评论
Matt J
Matt J 2025-3-28
编辑：Matt J 2025-3-28
Ran in:
If you want to exclude the small protrusions from the main lobe from the fit, you can also download,
https://www.mathworks.com/matlabcentral/fileexchange/90762-further-tools-for-analyzing-objects-in-n-dimensional-images
IM=im2gray(imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1830257/image.png'));
BW=~bwlalphaclose(~imbinarize(IM),15);
B=bwboundaries(BW,CoordinateOrder="xy");
fitobj=ellipticalFit(B{1}')
fitobj =
ellipticalFit with properties: center: [146.5065 106.9114] a: 55.9204 b: 46.0753 angle: -85.1879
imshow(IM);hold on
plot(fitobj); hold off
●

请先登录，再进行评论。

Image Analyst
Image Analyst 2025-3-28
See the FAQ:
https://matlab.fandom.com/wiki/FAQ#How_can_I_fit_an_ellipse_or_other_shape_to_a_set_of_XY_data?
or see the attached function. You can get the (x,y) coordinates, once you have segmented the gray scale image into a binary image like this:
boundaries = bwboundaries(mask, CoordinateOrder="xy");
%visboundaries(boundaries); % Optional, if you'd like to see them overlaid on the image.
xy = boundaries{1};

类别

在 Help Center 和 File Exchange 中查找有关 Image Category Classification 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by