is their any way to calculate automatically this parameter from the image ?
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Anish Khan
am 25 Feb. 2021
Kommentiert: Anish Khan
am 15 Mär. 2021
Hi all,
I am looking for the calculate the the parameter mentioned in the image, Is that possible to calculate from the image ?
(I have attached the original image and other one attached to understand you that which value i need to calculate, (Black width, highlighted with the lime colour))Thank you.
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Akzeptierte Antwort
Image Analyst
am 27 Feb. 2021
Of course it's possible. Try this. Adapt as needed:
% Demo by Image Analyst, February, 2021.
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
clearvars;
workspace; % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 16;
fprintf('Beginning to run %s.m ...\n', mfilename);
%-----------------------------------------------------------------------------------------------------------------------------------
% Read in image.
folder = [];
baseFileName = 'original image.JPG';
fullFileName = fullfile(folder, baseFileName);
% Check if file exists.
if ~exist(fullFileName, 'file')
% The file doesn't exist -- didn't find it there in that folder.
% Check the entire search path (other folders) for the file by stripping off the folder.
fullFileNameOnSearchPath = baseFileName; % No path this time.
if ~exist(fullFileNameOnSearchPath, '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);
[rows, columns, numberOfColorChannels] = size(grayImage)
if numberOfColorChannels == 3
grayImage = rgb2gray(grayImage);
end
% Display the test image full size.
subplot(2, 3, 1);
imshow(grayImage, []);
axis('on', 'image');
caption = sprintf('Original Image : "%s"', baseFileName);
title(caption, 'FontSize', fontSize, 'Interpreter', 'None');
drawnow;
hp = impixelinfo(); % Set up status line to see values when you mouse over the image.
% Set up figure properties:
% Enlarge figure to full screen.
hFig1 = gcf;
hFig1.Units = 'Normalized';
hFig1.WindowState = 'maximized';
% 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.
hFig1.Name = 'Demo by Image Analyst';
%--------------------------------------------------------------------------------------------------------
% Get histogram
subplot(2, 3, 2);
imhist(grayImage);
grid on;
xlabel('Gray Level', 'FontSize', fontSize);
ylabel('Count', 'FontSize', fontSize);
% Threshold image.
mask = grayImage < 75;
% Clean up the mask to get only the stripes we want.
mask(:, 1 : 762) = false;
mask(:, 2615 : end) = false;
% Get rid any blob not 1500 wide
labeledImage = bwlabel(mask);
props = regionprops(labeledImage, 'BoundingBox');
allBB = vertcat(props.BoundingBox);
widths = allBB(:, 3);
wideBlobs = find(widths > 1500);
% Extract only those that are wide enough.
mask = ismember(labeledImage, wideBlobs);
% Display mask image.
subplot(2, 3, 3);
imshow(mask, []);
axis('on', 'image');
title('Mask', 'FontSize', fontSize, 'Interpreter', 'None');
drawnow;
hold on;
hp = impixelinfo(); % Set up status line to see values when you mouse over the image.
% Label each blob with 8-connectivity, so we can make measurements of it
[labeledImage, numberOfBlobs] = bwlabel(mask, 8);
% Apply a variety of pseudo-colors to the regions.
coloredLabelsImage = label2rgb (labeledImage, 'hsv', 'k', 'shuffle');
% Display the pseudo-colored image.
subplot(2, 3, 4);
imshow(coloredLabelsImage);
title('Labeled Blobs', 'FontSize', fontSize, 'Interpreter', 'None');
% Get all the blob properties. Can only pass in originalImage in version R2008a and later.
blobMeasurements = regionprops(labeledImage, grayImage, 'all');
numberOfBlobs = size(blobMeasurements, 1);
% For each blob, for each line, get the left edge and right edge then widths.
leftEdges = zeros(1, columns);
rightEdges = zeros(1, columns);
widths = zeros(columns, numberOfBlobs);
for blob = 1 : numberOfBlobs
thisBlob = ismember(labeledImage, blob);
% Display mask image.
subplot(2, 3, 5);
imshow(thisBlob, []);
axis('on', 'image');
caption = sprintf('Mask of Blob #%d of %d', blob, numberOfBlobs);
title(caption, 'FontSize', fontSize, 'Interpreter', 'None');
drawnow;
hp = impixelinfo(); % Set up status line to see values when you mouse over the image.
for col = 1 : columns
thisCol = thisBlob(:, col);
t = find(thisCol, 1, 'first');
if ~isempty(t)
leftEdges(col) = t;
rightEdges(col) = find(thisCol, 1, 'last');
end
end
widths(:, blob) = (rightEdges - leftEdges)';
subplot(2, 3, 6);
plot(widths, '-', 'LineWidth', 1);
hold on;
grid on;
drawnow;
legendStrings{blob} = sprintf('Blob #%d', blob);
end
grid on;
title('Widths', 'FontSize', fontSize, 'Interpreter', 'None');
xlabel('Row', 'FontSize', fontSize);
ylabel('Width in Pixels', 'FontSize', fontSize);
legend(legendStrings);
% Display mask image again.
subplot(2, 3, 5);
imshow(mask, []);
axis('on', 'image');
title('Mask', 'FontSize', fontSize, 'Interpreter', 'None');
drawnow;
hold on;
hp = impixelinfo(); % Set up status line to see values when you mouse over the image.
fprintf('Done running %s.m\n', mfilename);
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Hannah Paul
am 26 Feb. 2021
I tried with segmentation but not able to overcome with the problem. Seems like its not possible.
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