I want to make bounding box

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Lidank Abiel 2012-12-7

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https://ww2.mathworks.cn/matlabcentral/answers/55966-i-want-to-make-bounding-box

I want to make a bounding box in the area of the eye in this picture, so I can find the midpoint of the eye area, but I do not know how to make it. I was expecting help from the experienced. thanks in advance.

this is the picture:

http://www.freeimagehosting.net/3z35z

href="http://www.freeimagehosting.net/3z35z"<img src="http://www.freeimagehosting.net/t/3z35z.jpg"></a>

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Image Analyst 2012-12-7

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https://ww2.mathworks.cn/matlabcentral/answers/55966-i-want-to-make-bounding-box#answer_67870

I have the perfect demo for you: BlobsDemo http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 It has a bunch of blobs on the screen (coins) and then finds the centroids of them and cuts them out, using the bounding box, to new smallsub images.

But basically, you call regionprops and ask for 'BoundingBox'. Then use imcrop or regular indexing to extract the box containing your blob.

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Image Analyst 2012-12-10

编辑：Image Analyst 2012-12-10

在 MATLAB Online 中打开

Please just run this code. Make sure you change the name/folder of the image.

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
imtool close all;  % Close all imtool figures.
clear;  % Erase all existing variables.
workspace;  % Make sure the workspace panel is showing.
format longg;
format compact;
fontSize = 20;
% Read in a Lindank's image.
folder = 'C:\Users\Lindank\Documents';
baseFileName = 'eyes.jpg';
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
% Check if file exists.
if ~exist(fullFileName, 'file')
  % File doesn't exist -- didn't find it there.  Check the search path for it.
  fullFileName = baseFileName; % No path this time.
  if ~exist(fullFileName, 'file')
    % Still didn't find it.  Alert user.
    errorMessage = sprintf('Error: %s does not exist in the search path folders.', fullFileName);
    uiwait(warndlg(errorMessage));
    return;
  end
end
grayImage = imread(fullFileName);
% Get the dimensions of the image.  
% numberOfColorBands should be = 1.
[rows columns numberOfColorBands] = size(grayImage)
% Convert to grayscale
if numberOfColorBands > 1
  grayImage = grayImage(:, :, 2);
end
binaryImage = grayImage > 128;
% Display the original gray scale image.
% subplot(2, 2, 1);
imshow(binaryImage, []);
title('Binary Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
% Give a name to the title bar.
set(gcf,'name','Demo by ImageAnalyst','numbertitle','off') 
hold on;
labelShiftX = 5;
% Label
labeledImage = bwlabel(binaryImage, 8);     % Label each blob so we can make measurements of it
% Get all the blob properties.  Can only pass in originalImage in version R2008a and later.
blobMeasurements = regionprops(labeledImage, 'Centroid', 'BoundingBox', 'Area');
numberOfBlobs = size(blobMeasurements, 1);
% Loop over all blobs printing their measurements to the command window.
for k = 1 : numberOfBlobs           % Loop through all blobs.
  blobArea = blobMeasurements(k).Area;    % Get area.
  blobBoundingBox = blobMeasurements(k).BoundingBox;    % Get Bounding box.
  % Plot bounding box for this blob.
  x1 = blobBoundingBox(1);
  y1 = blobBoundingBox(2);
  x2 = x1 + blobBoundingBox(3);
  y2 = y1 + blobBoundingBox(4);
  x = [x1 x2 x2 x1 x1];
  y = [y1 y1 y2 y2 y1];
  plot(x, y, 'r-');
  
  % Get centroid for this blob.
  blobCentroid = blobMeasurements(k).Centroid;    % Get centroid one at a time
  plot(blobCentroid(1), blobCentroid(2), 'r+', 'MarkerSize', 13);
  fprintf(1,'#%2d %17.1f %11.1f\n',...
    k,  blobArea, blobCentroid);
  % Put the "blob number" labels on the "boundaries" grayscale image.
  text(blobCentroid(1) + labelShiftX, blobCentroid(2), num2str(k), 'FontSize', fontSize, 'FontWeight', 'Bold');
end

Image Analyst 2012-12-17

That's a format specifier string. I guess you don't know C or C++ or C# do you? It's the same as in those languages. % means that you stick a variable there. The number after the % says how many spaces to allot for it. The first number (if present) is the total length, and the number after the . is the number of digits after the decimal place. Finally the letter is what class the variable is: f = floating point, d = integer, c = character, s = string. So %17.3f means a floating point number in a space of 17 characters with 3 of those 17 being to the right of the decimal place.

Lidank Abiel 2012-12-19