Find position of fiducials in an image

Question

Thomas Koelen 2015-4-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/212955-find-position-of-fiducials-in-an-image

回答： KIVANÇ mutlu 2020-5-30

I have the following image:

I'm trying to let maltab find the center point of the fiducials, but I can't think of a good way to do it. I tried to find edges, and I also tried corners, both didn't really work out.

Any ideas that might help me further?

kind regards

Thomas

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Thomas Koelen 2015-4-22

编辑：Thomas Koelen 2015-4-22

Tried something wiht edge, getting this..:

It doesnt even show the edges of the fiducials :(

edit:

got something a bit better now:

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Answer 1

Thomas Koelen 2015-4-23

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https://ww2.mathworks.cn/matlabcentral/answers/212955-find-position-of-fiducials-in-an-image#answer_176377

在 MATLAB Online 中打开

For anyone wondering how I fixed this:

clc
clear all
close all
original=imread('Untitled12345.png');
foto=im2bw(imread('Untitled12345.png'),0.35);
nhood      = zeros(19);
nhood(10,:) = ones(1,19);
nhood(:,10) = ones(19,1);
strel1     = strel('arbitrary',nhood);
IM2=imdilate(foto,strel1);
IM3=imcomplement(IM2);
IM3=medfilt2(IM3);
B = bwboundaries(IM3,'noholes');
for iloc=1:length(B)
    locxy(iloc,1)=round(mean(B{iloc}(:,1)));
    locxy(iloc,2)=round(mean(B{iloc}(:,2)));
end
imshow(original);
hold on
plot(locxy(:,2),locxy(:,1),'*')

which gives me:

<http://imgur.com/ah9LHb2>

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Answer 2

KIVANÇ mutlu 2020-5-30

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https://ww2.mathworks.cn/matlabcentral/answers/212955-find-position-of-fiducials-in-an-image#answer_443031

image processing in a certain area and recording this area. How can we record the process parameters made in the image. two will be created in this area. The program will be registered and opened according to the picture type and will process images in these areas according to the set references.