Find coordinate of a point and place them in circular form

Question

Alina tom 2018-5-24

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评论： Alina tom 2018-5-29

Images.zip

Hi all

I have multiple binary images which consist of 271 columns and I want to get the coordinates of white pixels from each column and place them in circular(cylindrical) from . like red dot. read these dots and plot then in cylindrical coordinate

Actually I want to read first column pixels from all the images and plot them into cylindrical from and then read the second column and make a new circle and so one for all the column of the images

First one is input image and 2nd one is the output of 1st frame of cylindrical and soo on . any one help me with code

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Alina tom 2018-5-25

Sorry if my questions are stupid

Walter Roberson 2018-5-25

Sounds like something that iradon() might be useful for.

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Answer 1

Akira Agata 2018-5-29

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https://ww2.mathworks.cn/matlabcentral/answers/402396-find-coordinate-of-a-point-and-place-them-in-circular-form#answer_322356

在 MATLAB Online 中打开

As Walter-san mentioned, it sounds like iradon function. But seems not applicable this function directly. The following is my preliminary try and I believe possible solution would be like this.

Alina-san, let me clarify some points:

- Your data set contains 73 image files, so the result plots only 0~72 degrees. Is this OK for you?

- 1st and last column of each image is not a separated dots (separated logical "true"s) , but a line (continuous "true"s). These columns should be ignored, or should be plotted also?

fileList = struct2table(dir('./Images/*.tif'));
fileList = sortrows(fileList,'date');
h = 512; % Height of the image in pixel
BW = false(h);
for kk1 = 1:height(fileList)
I = imread(fullfile(fileList.folder{kk1},fileList.name{kk1}));
BWtmp = false(h);
BWtmp(:,h/2) = I(:,2);
BWtmp = imrotate(BWtmp,kk1-1);
center = size(BWtmp)/2;
BWtmp = imcrop(BWtmp,[center(1)-h/2+1,center(2)-h/2+1,h-1,h-1]);  
BW = BW | BWtmp;
end
figure
imshow(BW)