Major axis and minor axis

28 次查看（过去 30 天）

显示更早的评论

Pamela 2012-8-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/46761-major-axis-and-minor-axis

采纳的回答： Walter Roberson

How can I plot the major axis and minor axis for an object in an image?

2 个评论
显示无隐藏无

Pamela 2012-9-1

I need your held please !!

Image Analyst 2012-11-10

I've just added a section on "How do I create an ellipse" to the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_an_ellipse.3F so that might help you.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Walter Roberson 2012-8-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/46761-major-axis-and-minor-axis#answer_57183

regionprops() to get the centroid and orientation (angle). After that it becomes straight trig. The axes length is R, compute R*cos(theta), R*sin(theta), and center those displacements on the centroid.

17 个评论
显示 15更早的评论隐藏 15更早的评论

Pamela 2012-9-9

编辑：Pamela 2012-9-9

Hi! To study the similarity between 2 images we should use these steps???

-Calculate the mean of the input images

-Subtract the mean from the input images to obtain the mean-shifted images

-Calculate the eigenvectors and eigenvalues of the mean-shifted images

-Order the eigenvectors by their corresponding eigenvalues, in decreasing order

-Retain only the eigenvectors with the largest eigenvalues (the principal components)

-Project the mean-shifted images into the eigenspace using the retained eigenvectors

-Calculate the Euclidean distance

It's the same solution to study the asymmetry of the region?? Can this help me??

Thanks

Image Analyst 2012-9-9

Pamela, I haven't heard of that method to determine similarity. Much more common is SSIM ( http://en.wikipedia.org/wiki/SSIM) and friends, or even PSNR. Or you can use image moments: http://en.wikipedia.org/wiki/Image_moment

请先登录，再进行评论。