Extracting x,y data from scanned images of plotted data
- To: mathgroup at smc.vnet.net
- Subject: [mg124575] Extracting x,y data from scanned images of plotted data
- From: gac <g.crlsn at gmail.com>
- Date: Wed, 25 Jan 2012 07:05:16 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
I have a scanned image (JPG, black and white) of a plot of experimental data. Unfortunately for me, the original numerical data values are not available. The data is depicted as ~20 nested curves somewhat parabolic in shape (concave down). Each curve is open, but continuous from end to end. The curves do not intersect, and there are no data markers. I thought of using the image processing capabilities of Mathematica 8 to extract approximate values of the plotted data for use in further calculations. IOW, I want to use Mathematica to determine a set of x,y pairs for each curve. I could then use Mathematica to determine an InterpolationFunction for the plotted data. I could easily provide the proper scale after Mathematica determines the x,y pairs. Any advice? Thanks very much. gac