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convert line to pixel coordinate

조회 수: 2 (최근 30일)
mohammed alany
mohammed alany 2019년 8월 3일
편집: Image Analyst 2019년 8월 4일
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
example.jpg
  댓글 수: 4
darova
darova 2019년 8월 3일
What about pdist2()?
mohammed alany
mohammed alany 2019년 8월 3일
the problem i wanted all the coordinate of midpoints between each two nodes

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채택된 답변

Image Analyst
Image Analyst 2019년 8월 4일
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');
0001 Screenshot.png
  댓글 수: 3
Image Analyst
Image Analyst 2019년 8월 4일
편집: Image Analyst 2019년 8월 4일
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');
0001 Screenshot.png
You could also use interparc (File Exchange), or use splines (demo attached).
mohammed alany
mohammed alany 2019년 8월 4일
many thanks Image Analyst

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추가 답변 (1개)

Image Analyst
Image Analyst 2019년 8월 3일
Use bwdist().
  댓글 수: 9
mohammed alany
mohammed alany 2019년 8월 3일
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
darova
darova 2019년 8월 4일
What about interparc()?

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