how to find the change in curve
3 views (last 30 days)
Show older comments
prashant singh
on 25 Sep 2017
Answered: Image Analyst
on 25 Sep 2017
i have plotted a curve on my image. The curve is shown in red. I want to find the jump in my curve with some good algroithm. The area in the curve where i want to detect jump is shown in blue. I have tried to find difference between two point to detect jump but that always does not return me the points in the curve i want(show in blue).
2 Comments
Cedric
on 25 Sep 2017
But you have the red curve as e.g. a row vector already? If so, could you attach it?
Accepted Answer
More Answers (1)
Star Strider
on 25 Sep 2017
Try this:
D = load('ridx.mat');
ridx = D.ridx;
ridx = max(ridx)-ridx;
x = 1:length(ridx);
dt_ridx = detrend(ridx);
mask = dt_ridx > 27;
figure(1)
plot(x, ridx)
hold on
plot(x(mask), ridx(mask), '-r', 'LineWidth',1.2)
hold off
grid
Here mask is a logical vector that identifies the ‘jump’ region.
0 Comments
See Also
Categories
Find more on Spectral Measurements in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!