Sunday, 27 April 2014

Accuracy And Precision

In my DSP classes I often cover the difference between precision and accuracy when measuring and processing input values from a transducer.
I recently came across an excellent little illustration of this on page 7 of the Keller-Druck Brochure : http://flipflashpages.uniflip.com/2/52802/96120/pub/#page7.

From a signal processing point of view the key points from this diagram are :
  1/ When the measurements are very precise (as shown in diagram A) then accuracy can be improved by removing the offset via subtraction of the average of the samples.
  2/ When measurements are more accurate but there is a larger deviation (as shown in diagram B) then the deviation can be reduced by oversampling and averaging the results.

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