Преобразовать график на бумаге -> таблица значений. Как?

Debian наше все!

$ apt-cache show g3data

Description: extract data from scanned graphs
g3data is used for extracting data from graphs. For example, graphs
are typically published in scientific journals without tables of the
actual data; g3data makes the process of extracting these data easy.

http://www.digitizeit.de/#Screenshot
DigitizeIt is shareware. The unregistered version is for evaluation purposes only and will stop working after 21 days.

>Какие есть рабочие программы или библиотеки векторизации растра под Линукс?

autotrace

Description: bitmap to vector graphics converter
AutoTrace is a program for converting bitmaps to vector graphics. The aim
of the AutoTrace project is the development of a freely-available
application similar to CorelTrace or Adobe Streamline. In some aspects it
is already better. Originally created as a plugin for the GIMP,
AutoTrace is now a standalone program.

Спасибо, буду думать, как преобразовать эти диаграммы к форме прямоугольного графика.