EquivDiameter calculates the diameter of a circle . The result diameter is in mm or cm or other. Could you please answer if you know? Thanks all.

Question

Khaing Zin Htwe 2016-4-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/281188-equivdiameter-calculates-the-diameter-of-a-circle-the-result-diameter-is-in-mm-or-cm-or-other-cou

评论： Image Analyst 2016-4-27

Hello my seniors, EquivDiameter in regionprops calculates the diameter of a circle . The result diameter is in mm or cm or other. Could you please answer if you know? Thanks all.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2016-4-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/281188-equivdiameter-calculates-the-diameter-of-a-circle-the-result-diameter-is-in-mm-or-cm-or-other-cou#answer_219568

spatial_calibration_demo.m

It's in pixels. If you want in real world units, you have to determine a calibration scaling factor to convert pixels to real world units, like in my attached demo.

2 个评论
显示无隐藏无

Khaing Zin Htwe 2016-4-27

Is it possible to convert with Matlab functions to be the easier way,sir? If it is, please share me,sir.

Image Analyst 2016-4-27

在 MATLAB Online 中打开

What can possibly be easier than multiplying by a scalar?

distanceInCm = distanceInPixels * cmPerPixel;

That's as easy as it gets. You just have to know or figure out what cmPerPixel is. That's what the demo does - it asks you to click on a know distance in the image and asks you the number of real world units for it.

If you already know from other means what cmPerPixel is, then just simply do that multiplication. Really, take another look, it's actually an easy process.

请先登录，再进行评论。