how to extract spikes from a figure
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Hello, eveyone.
I am processing some borehole data, but I have a problem now. After I plot the data, the figure has many spikes. I want extract those spikes.
Each spike is different,i.e.,different width and length. I was thinking using a moving average filter, but it does not work well. Or maybe I could define a cutoff value,like three times of the std of the total data. However, those spikes or outliers affect statistics, so its not accurate.
I am wondering is there any way I could do it automatically instead of manually pick up the start and end point of each spike.
If anyone has any advice, please let me know. Many thanks.
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Walter Roberson
2012-6-29
Effectively you want a peak-finding program?
http://www.mathworks.com/help/toolbox/signal/ref/findpeaks.html (requires Signal Processing Toolbox)
A sample plot might help us. http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers
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Image Analyst
2012-6-29
If the built in peak detector doesn't work, then you might look elsewhere, such as to this paper:
Comparison of public peak detection algorithms for MALDI mass spectrometry data analysis
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