Engauge Digitizer 4.1

This open source, digitizing software converts an image file showing a graph or map, into numbers. The image file can come from a scanner, digital camera or screenshot. The numbers can be read on the screen, and written or copied to a spreadsheet.
The process starts with an image file containing a graph or map. The final result is digitized data that can be used by other tools such as Microsoft Excel and Gnumeric.

图形数字化软件。可以将曲线图转化为数据与等式。当用仪表做出曲线图后，用扫描仪扫入计算机，便能用此软件处理了。