change the color of line inside the boundaries and measure length of this part of line?

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Walaa
Walaa 2022-12-1
评论： Rik 2022-12-1
Could you kindly help me in changing the colour of the line inside the red borders to green and measuring the length of this part of  line? I attached the code for plotting the cyan line.
% Plot the boundary over the original image
% Display the image.
subplot(1,2, 2);
imshow(originalImage2, []);
hold on;
caption = sprintf('original image with plotted disc diameter');
title(caption, 'FontSize', 10);
hold on
plot(smoothX1, smoothY1, 'r-', 'LineWidth', 4);
plot(smoothX2, smoothY2, 'r-', 'LineWidth',4);
hold on
%-------------------------------------------------------------------------------------------------------------------------------------
xLine = [smoothx1(index1), smoothX2(index2)];
yLine = [smoothy1(index1), smoothY2(index2)];
hold on
numLines = 1;
lineColors = jet(numLines);
x = randi(columns, numLines, 2);
y = randi(rows, numLines, 2);
% Now extend these lines in the overlay until the image edge.
for k = 1 : numLines
coefficients = polyfit( xLine (k, :), yLine(k, :), 1);
% Define x values to be the whole width of the image.
xFit = 1 : columns;
% Get y values. Note: some may be less than 1 or more than rows but we will adjust.
yFit = polyval(coefficients, xFit);
goodIndexes = yFit >= 1 & yFit <= rows;
xFit = xFit(goodIndexes);
yFit = yFit(goodIndexes);
% Display in overlay above the image.
line([xFit(1), xFit(end)], [yFit(1), yFit(end)], 'Color', lineColors(k, :), 'LineWidth', 3);
end
  2 个评论
Rik
Rik 2022-12-1
If you have the coordinates of the red line, you should be able to find the intersection. Once you have those, finding the length is trivial, as is plotting a new line with a different color.
You can even use my point_to_line_distance function to find the boundary elements closest to the line.

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