How to extract point of interest from plotted graph?
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I have plotted the graph by calculating this average horizontal values and then calculate their local minima points. Now I want to extract to two minima points which are my point of interest and then calculate distance between them. These point of interest are marked in graph with outline. these points are 2nd and 5th minima i.e first valley from negative to positive and second valley from positive to negative. can anyone help me out?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/151972/image.jpeg)
I1=imread('open.jpg');
I2=rgb2gray(I1);
figure, title('open');
plot(1:size(I2,1), mean(I2,2));
hold on
horizontalAverages = mean(I2 , 2);
plot(1:size(I2,1) , horizontalAverages)
[Minimas locs] = findpeaks(-horizontalAverages)
plot(locs , -1*Minimas , 'r*')
Minimas =
-86.5647
-80.3647
-81.3588
-106.9882
-77.0765
-77.8235
-92.2353
-106.2235
-115.3118
-98.3706
locs =
30
34
36
50
93
97
110
121
127
136
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回答 (1 件)
Walter Roberson
2015 年 11 月 19 日
In your code, they are going to be located at locs(2) = 34 and locs(5) = 93, so the distance between them will be 93-34
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