I need to digitalize an already captured analog heart rate profile

[cohorn]

I am trying to find a simple solution to digitalize heart rate profile printouts.

I have numerous graphs containing heart rate variability over time and need to digitalize these to statistical purposes.

Does Labview or any other NI software have this capabilty?

[chilly_charly]

Convert your graph to a a grey levels picture. Then the picture to an array using the unflatten pixmap vi . Search each array column for the grey level value corresponding to the graph using the Treshold 1D array vi. Do some offset and scaling correction and that's it.

Of course it's easier to write it than to do it, but that should not be too difficult if your graph are clean and if you can separate easily the heart rate curve from the background. If there is a grid, hopefully it will have a different color so that you will be able to  eliminate it.

Post a picture of one graph if you need further help.

[Henrik_Volkers]

Playing around with your digitizer setup can help a lot.

I suggest a simple scanner if it can be done on a letter sized  (A4) paper for a first try.

You can download the vision tool for a 30 days try out,  can save a lot of time

But like with every tool: Your faster and get better results if you know how to use it.

I'm afraid  the printouts have different style so you might have to choose different strategies or setups to get good result.

However the best idea is to call your local NI support. Look if there is a trade show or other NI event near by and take a memory stick or CD with some scans. These people seems to love ad hook challenges