data from JPEG

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Cameron Frament
Cameron Frament 2011-8-1
评论： LALIT PANKAJ GROVER 2021-9-23
I have a *.jpeg image of a x-y scatter plot (not monotonic), and I would like to extract the data points. Any ideas? I was going to do it manually by pixels, but I figured that there is a good way to do that with linear algebra.
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Ashish Uthama
Ashish Uthama 2011-8-1
Posting the picture might help get a better answer.
LALIT PANKAJ GROVER
LALIT PANKAJ GROVER 2021-9-23
How can I extract the data from this jpeg file. Any suggestion are welcomed.

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回答（1 个）

John Barber
John Barber 2011-8-1
The File Exchange program GRABIT is a good way to extract data points from an image of a graph. Download it here: http://www.mathworks.com/matlabcentral/fileexchange/7173
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Image Analyst
Image Analyst 2011-8-1
FFT function ?!?!? Do you know what the FFT is?
I suppose you could use image analysis (thresholding, labeling, regionprops) if your points were well isolated and you had already cropped the axes, tick marks, etc. out of your image. I second Ashish's suggestion.
lakshmi boddu
lakshmi boddu 2018-4-3
Hello sir , can you please help me how to draw a scatter plot for a jpg image

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