Most of the source code for Plot Digitizer is protected either by the General Public License (GPL) or by the Lesser General Public License (Lesser GPL). Then follow the instructions at the bottom of the window to calibrate the plot and then digitize the points. Run Plot Digitizer, open the scanned image file from the "Open" command in the "File" menu. To use this program, first scan a plot with your favorite scanning system, then save the plot as a GIF, JPEG, or PNG format file.
I've found this feature to be pretty useful on digitizing plots of experimental test time histories, but your mileage may vary.
However, even in cases where it doesn't auto-digitize the entire line, you can sometimes do a piece of it automatically, then manually digitize a piece, and then do another piece automatically, etc. After using the program a while you begin to learn what it can and can't auto-digitize. Long answer: The auto-digitizing feature works best with black and white, 300 dpi images of continuous data which does not run vertically (vertical lines give it fits), does not repeatedly cross other data lines, is not close to and parallel to grid lines, is not extremely noisy and which does not have plot symbols. Will the auto-digitizing feature digitize any plot? Short answer: no. More information on autotrace can be found here: In order to use the auto-digitizing feature, you must have autotrace installed. This auto-digitizing feature depends on an image vectorization program called "autotrace". The user simply indicates where the line is on the plot with a thick paint brush and the program attempts to automatically sort out the data from grid lines, etc. You can save calibrations for an image for later use, and finally, there is unlimited undo/redo.Ī special feature of this program is the ability to semi-automatically digitize lines off a plot. You can compute the length of a digitized curve and you can compute the area of a digitized polygon. You can move points by clicking and dragging them. You can delete points by right-clicking on the points and choosing "Delete". You can insert points between two already digitized points by right clicking and choosing "Insert" from the pop-up menu. For example: You can recalibrate the Y axis without having to recalibrate the X axis (multiple sets of data are commonly plotted with the same X axis). To make the digitizing task easier, this program includes many handy features. Besides digitizing points off of data plots, this program can be used to digitize other types of scanned data (such as scaled drawings or orthographic photos). Plot Digitizer works with both linear and logarithmic axis scales. The numbers can then be saved to a text file and used where ever you need them. This program will allow you to take a scanned image of a plot (in GIF, JPEG, or PNG format) and quickly digitize values off the plot just by clicking the mouse on each data point. In order to use this data, it must somehow be digitized. Often data is found presented in reports and references as functional X-Y type scatter or line plots. Plot Digitizer is a Java program used to digitize scanned plots of functional data.
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