Convert image pixels to XYZ-coordinates (3D plot)

Question

Alberto Acri 2022-10-23

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1833238-convert-image-pixels-to-xyz-coordinates-3d-plot

评论： Alberto Acri 2022-10-26

采纳的回答： Image Analyst

在 MATLAB Online 中打开

Hello everyone,

I want to extend the following code:

Im = imread('./Images/Plot.png');
figure(1);
imshow(Im);
CoordinateMatrix = pic2points(Im);
scatter(CoordinateMatrix (:,1), CoordinateMatrix (:,2),'.');
figure(2);

so that:

- be able to display multiple images in the same graph (the images are in the "Images" folder that has been created; an example of an image is the one attached)

- display the graph in 3D (and not in 2D as in this case)

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Alberto Acri 2022-10-23

编辑：Alberto Acri 2022-10-23

在 MATLAB Online 中打开

I changed the code in the following way but it only allows me to see a transformed figure with "pic2point".

myFolder = 'C:\Users\Alberto\Downloads\pic2points\Images';
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
filePattern = fullfile(myFolder, '*.png');
jpegFiles = dir(filePattern);
for k = 1:length(jpegFiles)
  baseFileName = jpegFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
  imageArray = imread(fullFileName);
  % figure();
  imshow(imageArray);  % Display image.
  drawnow; % Force display to update immediately.
  figure(1);
  CoordinateMatrix = pic2points(imageArray);
  scatter(CoordinateMatrix (:,1), CoordinateMatrix (:,2),'.');
  figure(2);
end

Alberto Acri 2022-10-23

I would like to open the images obtained at the end of the "pic2points" function into a single three-dimensional image.

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Answer 1

Image Analyst 2022-10-23

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1833238-convert-image-pixels-to-xyz-coordinates-3d-plot#answer_1081563

在 MATLAB Online 中打开

Try this:

myFolder = 'C:\Users\Alberto\Downloads\pic2points\Images';
if ~isfolder(myFolder)
    errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
    uiwait(warndlg(errorMessage));
    return;
end
filePattern = fullfile(myFolder, '*.png');
imageFiles = dir(filePattern);
for k = 1:length(imageFiles)
    baseFileName = imageFiles(k).name;
    fullFileName = fullfile(myFolder, baseFileName);
    fprintf('Now reading %s\n', fullFileName);
    imageArray = imread(fullFileName);
    CoordinateMatrix = pic2points(imageArray);
    scatter(CoordinateMatrix(:, 1), CoordinateMatrix(:, 2), '.');
    hold on;
end
fprintf('Done!\n');

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Image Analyst 2022-10-25

在 MATLAB Online 中打开

Try this

clc;    % Clear the command window.
fprintf('Beginning to run %s.m ...\n', mfilename);
close all;  % Close all figures (except those of imtool.)
clearvars;
workspace;  % Make sure the workspace panel is showing.
format short g;
format compact;
myFolder = pwd; %'C:\Users\Alberto\Downloads\pic2points\Images';
if ~isfolder(myFolder)
    errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
    uiwait(warndlg(errorMessage));
    return;
end
filePattern = fullfile(myFolder, '*.png');
imageFiles = dir(filePattern);
hFig3 = figure('Name', '3D Plot', 'NumberTitle', 'off');
for k = 1:length(imageFiles)
    baseFileName = imageFiles(k).name;
    fullFileName = fullfile(myFolder, baseFileName);
    fprintf('Now reading %s\n', fullFileName);
    imageArray = imread(fullFileName);
    drawnow;
    % Call pic2points.  This will open a new figure.
    CoordinateMatrix = pic2points(imageArray);
    % Switch to the figure for the 3-D plotting:
    figure(hFig3);
    % scatter(CoordinateMatrix(:, 1), CoordinateMatrix(:, 2), '.');
    z = k * ones(size(CoordinateMatrix, 1), 1);
    plot3(CoordinateMatrix(:, 1), CoordinateMatrix(:, 2),  z, '.');
    hold on
    drawnow;
end
grid on;
hFig3.WindowState = 'maximized';
fprintf('Done running %s.m.\n', mfilename);

Image Analyst 2022-10-26

在 MATLAB Online 中打开

Yes, just specify the color in plot3(), for example if you want blue:

plot3(CoordinateMatrix(:, 1), CoordinateMatrix(:, 2), z, 'b.');

Since it answered your question, could you please click the "Accept this answer" link?

Thanks in advance. 🙂

Alberto Acri 2022-10-26

Thank you @Image Analyst! I will make another post to see if it is possible to set a step value to my liking.

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Convert image pixels to XYZ-coordinates (3D plot)

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Convert image pixels to XYZ-coordinates (3D plot)

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