How to detect the inner and outer diameters of one image in high quality simultaneously (0.98M 2168×2072)?

Hi，everyone.

I have two problems.

Problem 1. To detect the inner and outer diameters in the same image in high quality simultaneously, and the image is 0.98M(2168×2072pixel). After trying by matlab, I just can use "imfindcircles" to detect the daimeter less than 200 pixels.

Problem 2. The circles in image below is not totally circular. As a matter of fact, the two circles are a little oval. Therefore, just thinking the two circles as ovals, I want to detect Major and minor axes of the inner and outer circles in the image.

I just read the other question (https://www.mathworks.com/matlabcentral/answers/455501-detect-and-measure-radius-of-round-object-quality-photos?s_tid=srchtitle), I cannot solve it.

Can you please advise on:

• Any advice on code is welcome, I am just starting with my project, so I will go in required direct.
• Providing some Internet links about taking photos by industrial cameras and image processing by matlab.
• Some cases or Internet links about using matlab as software to do image processing in manufacturing plant.

Thank you, best regrads!

19.03.2020

[Andy Zhao]

I shrink the image for calculating its radius(or diameter), but I just get the inner circle's radius.

tic

rgb = imread('RingSeal_20200314.jpg');

subplot(2,2,1),imshow(rgb);

d = imdistline;

I = rgb2gray(rgb);

subplot(2,2,2),imshow(I)

[c,r] = imfindcircles(rgb,[80,150]);

%when proccessing with an image of higher properties those parameters [x, y] are changed, althou i havent had success

subplot(2,2,3),imshow(rgb);

viscircles(c,r);

subplot(2,2,4),imshow(I);

viscircles(c,r);

[c,r]

toc

After calculating by Matlab, the answer is followed:

ans =

line 1

183.669253750496

line 2

172.680044458067

line 3

92.6226833779506

10.791631 seconds.

shrinked image

Answer 1

[Shubh Sahu]

hey,

I have attached some links to find diameter of concentric cirlces:

https://www.mathworks.com/matlabcentral/answers/371589-i-tried-to-find-inner-and-outer-diameter-of-an-circle-using-this-code-but-it-didn-t-give-me-outputs?s_tid=answers_rc1-3_p3_MLT

https://blogs.mathworks.com/steve/2012/09/04/detecting-circular-objects-in-images/?s_tid=answers_rc2-3_p6_Topic

here are few links which might serve your purpose:

Modeling and Simulating Advanced Catalysts to Reduce Non-Road Vehicle Emissions

Baker Hughes Develops Predictive Maintenance Software for Gas and Oil Extraction Equipment Using Data Analytics and Machine Learning

[Andy Zhao]

Thank you very much. These links are helpful.

[Andy Zhao]

Group-attributes:

Children: [2×1 Line]

Visible:'on'

HitTest:'on'

Show all properties

ans =

487.3544 652.1783

It took 9.470028 seconds.