Activity 1: Digital Scanning

We obtained a scanned graph from the Canadian Journal of Physics (1951) and tried to reproduce it in MS Excel using some basic image processing. Here are the steps I used in doing this activity:

1. Get pixel location of the graph's origin, points in the graph and pixel distances of axes tick marks.
2. Subtract the offset due to orientation of the graph's origin and MS Paint's origin.
3. Use ratio and proportion to find corresponding pixels and points on the graph.
4. Graph the data using MS Excel and overlay the original graph for comparison.

And here is the result:The red points are the reconstructed data. The original points on the graph are in black.

I give myself 10 points for this activity since there is a good correspondence between the original and reconstructed data. (The black points were overlapped by the red points, which show good correspondence.)