convert line to pixel coordinate

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mohammed alany 2019-8-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/474724-convert-line-to-pixel-coordinate

编辑： Image Analyst 2019-8-4

Hi,

if i have a path consist of six points , and i have obstacle, what i want is to put nodes in all the path to count the minimum distance between

the obstacle and the path

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darova 2019-8-3

What about pdist2()?

mohammed alany 2019-8-3

the problem i wanted all the coordinate of midpoints between each two nodes

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采纳的回答

Image Analyst 2019-8-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/474724-convert-line-to-pixel-coordinate#answer_386083

在 MATLAB Online 中打开

What if you just take the average of the initial, known points?

x = sort(rand(9, 1));
y = sort(rand(9, 1));
plot(x, y, '.-', 'Color', [247, 148, 20]/255, 'MarkerSize', 40);
grid on;
xlabel('X');
ylabel('Y');
xAve = (x(1:end-1) + x(2:end))/2;
yAve = (y(1:end-1) + y(2:end))/2;
hold on;
plot(xAve, yAve, '.', 'Color', [206, 24, 18]/255, 'MarkerSize', 40);
legend('Original Points', 'Mid Points', 'Location', 'north');

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Image Analyst 2019-8-4

编辑：Image Analyst 2019-8-4

在 MATLAB Online 中打开

spline_demo.m

You could use linspace() instead of just averaging. Try this:

x = sort(rand(9, 1));
y = sort(rand(9, 1));
% Now we have sample data and can begin.
numPoints = 2; % # points in between, not including the knot endpoints.
xAve = x(1);
yAve = y(1);
for k = 2 : length(y)
	inBetweenPoints = linspace(x(k-1), x(k), numPoints + 2); % 2 more to include the knots.
	xAve = [xAve, inBetweenPoints(2:end)];
	inBetweenPoints = linspace(y(k-1), y(k), numPoints + 2);
	yAve = [yAve, inBetweenPoints(2:end)];
end
plot(xAve, yAve, '.', 'Color', [206, 24, 18]/255, 'MarkerSize', 40);
hold on;
plot(x, y, '.-', 'Color', [247, 148, 20]/255, 'MarkerSize', 40);
grid on;
xlabel('X');
ylabel('Y');
legend('Mid Points', 'Original Points', 'Location', 'north');

You could also use interparc (File Exchange), or use splines (demo attached).

mohammed alany 2019-8-4

many thanks Image Analyst

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Image Analyst 2019-8-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/474724-convert-line-to-pixel-coordinate#answer_386050

Use bwdist().

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mohammed alany 2019-8-3

dear Image Analyst,

i have list of (x,y) coordinates, which is six orange spots as in figure,

i would like to finde midpoints along the path in order to calculate

the minimum distance between the all path with obstacles,

in my case if i have just 6 nodes, i will find just the distance between the orange spots and obstacles and this is dosn't mean the minimum distance between the obstacle and the path