How to output centroid coordinate from switch case wihtin loop case

Question

Chanoknunt Sangsobhon 2022-11-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1850033-how-to-output-centroid-coordinate-from-switch-case-wihtin-loop-case

评论： Chanoknunt Sangsobhon 2022-11-15

在 MATLAB Online 中打开

Hello again. Sorry for my question again.

I have a code to detected the shape using for loop and switch case.

I can plot the centroid on image but I cannot extract the centroid coordinate from it.

I want the centroid coordinate in the form of matrix of excel file or anything that I can use the information in the next step.

This is the code I have. For this code I cannot obtained the all centroid detected within this loop.

Furthermore, this is the code use for 1 image. In short future, I have to read the all images in folders and do this to every image. So, I need to store the centroid coordinate of every image and use it for calculation. I will be so thankful if you can guide me for this.

Thank you in advance.

for i = 1 : length(STATS)
  W(i) = uint8(abs(STATS(i).BoundingBox(3)-STATS(i).BoundingBox(4)) < 0.1);
  W(i) = W(i) + 2 * uint8((STATS(i).Extent - 1) == 0 ); 
  W(i) = W(i) + 4 * uint8((STATS(i).Extent - 1) <= 0.7854); %Extent = pi/4 case ellipse/circle
  centroid = STATS(i).Centroid; 
  switch W(i)
      case 5
          plot(centroid(1),centroid(2),'wO');
          x_centroid = centroid(1:2:end);
          y_centroid = centroid(2:2:end);
      case 2
          plot(centroid(1),centroid(2),'wX');
      case 3
          plot(centroid(1),centroid(2),'wS');
      %case 4
          %plot(centroid(1),centroid(2),'w+');
  end
end

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 2022-11-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1850033-how-to-output-centroid-coordinate-from-switch-case-wihtin-loop-case#answer_1098758

在 MATLAB Online 中打开

Put all that in a loop over all files. For code snippets, see the FAQ:

https://matlab.fandom.com/wiki/FAQ#How_can_I_process_a_sequence_of_files?

If you still can't figure it out, write back.

If you want to save the centroid(s) for the blob(s) in this image, save STATS into a cell array

filePattern = '*.png';
fileList = dir(filePattern);
numImages = numel(fileList);
for frameIndex = 1 : numImages
    thisFileName = fullfile(fileList(frameIndex).folder, fileList(frameIndex).name);
    fprintf('Processing %s\n', thisFileName)
    STATS = regionprops(binaryImage, 'Centroid', 'Extent', 'BoundingBox');
    for i = 1 : numel(STATS)
        % Code
    end
    ca{frameIndex} = STATS; % Save centroids for all the blobs into a cell for this particular image.
end

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Chanoknunt Sangsobhon 2022-11-15

I have tried the code but the ca obtained only 1 centroid value which I don't know what value it is whether it is which centroid or it is x or y coordinate. I mean, I tried used it with one image first but in that image suppose to have 2 centroids but it obtained only 1 centroid value.

请先登录，再进行评论。