Why the codes detects the binary image wrong?

Question

Dayangku Nur Faizah Pengiran Mohamad 2024-5-13

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2117986-why-the-codes-detects-the-binary-image-wrong

评论： Image Analyst 2024-5-15

采纳的回答： Image Analyst

1_245.jpg

在 MATLAB Online 中打开

Hello all. Why the codes detects the binary image the wrong one? Below I attach the codes, and sample of my data.

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 20;
%===============================================================================
% Read in gray scale demo image.
rgbImage = imread('1_245.jpg');
% Get the dimensions of the image.
% numberOfColorChannels should be = 1 for a gray scale image, and 3 for an RGB color image.
[rows, columns, numberOfColorChannels] = size(rgbImage)
if numberOfColorChannels > 1
  % It's not really gray scale like we expected - it's color.
  % Use weighted sum of ALL channels to create a gray scale image.
  %   grayImage = rgb2gray(rgbImage);
  % ALTERNATE METHOD: Convert it to gray scale by taking only the green channel,
  % which in a typical snapshot will be the least noisy channel.
  grayImage = rgbImage(:, :, 2); % Take green channel.
else
  grayImage = rgbImage; % It's already gray scale.
end
% Now it's gray scale with range of 0 to 255.
% Display the image.
subplot(2, 3, 1);
imshow(grayImage, []);
title('Original Image', 'FontSize', fontSize, 'Interpreter', 'None');
axis('on', 'image');
hp = impixelinfo();
%------------------------------------------------------------------------------
% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0, 0.04, 1, 0.96]);
% Get rid of tool bar and pulldown menus that are along top of figure.
% set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')
drawnow;
% Show the histogram
subplot(2, 3, 2);
[counts, grayLevels] = histcounts(grayImage(:));
counts(counts == max(counts)) = 0; % Suppress spike
bar(grayLevels(1:end-1), counts);
grid on;
title('Histogram of Original Image', 'FontSize', fontSize, 'Interpreter', 'None');
% Median Filter to get rid of seams in wall.
windowSize = 11;
mfImage = medfilt2(grayImage, [windowSize, windowSize]);
% Display the image.
subplot(2, 3, 3);
imshow(mfImage, []);
title('Median Filtered Image', 'FontSize', fontSize, 'Interpreter', 'None');
axis('on', 'image');
hp = impixelinfo();
windowSize = 13;
sdImage = stdfilt(mfImage, ones(windowSize));
% Display the image.
subplot(2, 3, 4);
imshow(sdImage, []);
title('Standard Deviation Image', 'FontSize', fontSize, 'Interpreter', 'None');
axis('on', 'image');
hp = impixelinfo();
% Show the histogram
subplot(2, 3, 5);
[counts, grayLevels] = histcounts(sdImage(:));
counts(counts == max(counts)) = 0; % Suppress spike
bar(grayLevels(1:end-1), counts);
grid on;
title('Histogram of Standard Deviation Image', 'FontSize', fontSize, 'Interpreter', 'None');
% Binarize the image
binaryImage = sdImage >= 25;
% Remove blobs touching border.
binaryImage = imclearborder(binaryImage);
% Take largest blob
binaryImage = bwareafilt(binaryImage, 1);
% Display the image.
subplot(2, 3, 6);
imshow(binaryImage, []);
title('Binary Image', 'FontSize', fontSize, 'Interpreter', 'None');
axis('on', 'image');
hp = impixelinfo();
% Get widths as a function of row
widths = zeros(rows, 1);
for row = 1 : rows
  col1 = find(binaryImage(row, :), 1, 'first');
  col2 = find(binaryImage(row, :), 1, 'last');
  if ~isempty(col1)
    widths(row) = col2 - col1 + 1;
  end
end
figure
subplot(2, 1, 1);
plot(widths, 'b-', 'LineWidth', 2);
xlabel('Row', 'FontSize', fontSize);
ylabel('Width', 'FontSize', fontSize);
% Find valleys byinverting and finding peaks
[peakValues, indexes] = findpeaks(-widths);
peakValues = -peakValues; % Negate to flip over.
grid on;
hold on;
plot(indexes, peakValues, 'r+', 'MarkerSize', 12, 'LineWidth', 2);
% The neck is the first peak.
neckRow = indexes(1);
% Display the original image again.
subplot(2, 1, 2);
imshow(grayImage, []);
axis('on', 'image');
title('Original Image', 'FontSize', fontSize, 'Interpreter', 'None');
axis('on', 'image');
hp = impixelinfo();
% Put a line up over the neck.
hold on;
line(xlim, [neckRow, neckRow], 'Color', 'r', 'LineWidth', 2);
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0, 0.04, 1, 0.96]);

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Dayangku Nur Faizah Pengiran Mohamad 2024-5-13

Here the result shown.

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Answer 1

Image Analyst 2024-5-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2117986-why-the-codes-detects-the-binary-image-wrong#answer_1456316

That's a demo of mine that was probably not developed for your particular image. You'll have to modify it for your image. I don't know what you're trying to find in your original image so I don't know what to suggest. What are you trying to find and measure exactly?