dimanche 13 novembre 2016

GID release #06 - with Recurve, a chart data recovery tool

GID means Generic Image Decoder, a free, open-source library that can be found here.

The latest release features a couple of new application examples, among them a tool called Recurve for retrieving data from an image with plotted curves. Typically you come across a chart on a web site and would like to get the corresponding data, for reworking them in Excel - perhaps you want to spot specific values, or compare two curves that were not originally on the same chart, or use the data for further calculation. Sometimes the data is not available from the web site - and even less if the chart is from a PDF or a scanned newspaper page.

Fortunately, Recurve will do the painful job of retrieving the data points for you. It will detect gridlines and filter them out, then track the curves by matching their respective colours.

An example here:
Mortgage rates in Switzerland - 2004 to now. Chart is from the Comparis web site

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