|Extract data values from an image of graph or plot
Did you ever have to digitize the data, to extract data values from a published graph? Sometimes it is necessary
to compare the data obtained from independent sources to modern data. You want to manipulate the data, include it in another
to find the best curve to fit the data. You need the raw numbers for calculations. But in most publications only plots but no data values are published.
You have a graph from a report and you want to convert plots
back to X,Y data.
A real life example would be: x=
going to Canada, y= airline ticket price,
which would tell you what the
cheap flights for a business trip to Quebec, would be.
The Wizard of Digitization will help you to digitize the data.
This example shows a graph of test data. FindGraph reads the file containing the image and displays it on screen as a background.
You select one or several areas and start the Wizard of Digitization.
Next step you select mapping
and set the scale by setting X left, X right, Y top and Y bottom values.
Linear or logarithmic axis are supported.
Graphs are handled automatically or manually.
Cursor position zoom lets you select several pixel
colors to digitize. Sophisticated algorithm is used to exclude net. Of course,
you can manually add single data points and remove mistakes.
Published data can be accurately captured.
In this picture you can see data digitized by FindGraph.
In most scientific publications plots are available only as Adobe Acrobat PDF files.
FindGraph makes it easy to retrieve data points from such a plot.
You have not to capture screenshots before digitizing.
Simple use 'Add Points from screen' option.
Move and resize the framework window and position it to fit the graph.
Now you can mark the data points directly on the screen.
Some features of Digitizing tool:
BMP, WMF, EMF, JPEG and GIF graphics formats support
It is possible to digitize only selected data
Handle log and linear scales
Automatic correction for rotated charts and graphs
Cursor position zoom lets you select several pixel colors
Feature to use not orthogonally positioned calibration points when digitizing
Algorithm to exclude the net
Algorithm to exclude poor points
Multiple Y values for each X
Zoom for precision digitizing
Add single data point with the insert key
Delete mistakes with the delete key
Multiple different data sets can be defined
Sorting of data values
Export obtained data to text file or to the clipboard
Read more about:
how to digitize a chart using the calibration points;
how to take a scanned image of a plot and transform it into XY data.
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