* You are viewing Posts Tagged ‘digitize’

Digitizing data from old figures with ImageJ

Following on this earlier post concerning the retrieval of data from figures in published papers with R, here is a method for doing the same with ImageJ. This is a freely available program that should run on Windows/Mac/Linux, just like R. To extract data points from a figure, you’ll need the Figure_Calibration plugin developed by Frederic V. Hessman, available here. Download the Figure_Calibration.class file from that page and save it to your ImageJ/plugins/ directory. Then load up ImageJ.

[caption id=”attachment_1051″ align=”aligncenter” width=”400″ caption=”The example figure that we wish to retrieve data from. We can use … Continue Reading

Digitizing data from old plots using ‘digitize’

The June 2011 issue of The R Journal contains an article on the R package digitize (link to pdf) by Timothée Poisot. This might prove to be a handy tool if you occasionally find yourself needing to retrieve data points from figures in old articles for which you don’t have the raw data. There are a number of other stand-alone software tools to accomplish this same task, such as PlotDigitizer, DataThief, or TechDig (good luck finding that last one). These other programs all work, but I use them so rarely … Continue Reading