# How to get percentage difference between two matrices?

Good day everyone, I just want to ask how to get the percentage difference between two binary matrices. This is for comparing two images converted to matrices in LabView. Thank you.
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pinkman wrote:
Good day everyone, I just want to ask how to get the percentage difference between two binary matrices. This is for comparing two images converted to matrices in LabView. Thank you.
You probably converted it to a 2D array (A matrix in LabVIEW has a special meaning).
"Binary" is not very well defined (unless you are looking for the number of bits that are different). What is the datatype? Was it a color image or a greyscale image? Are both arrays the same size?
How do you define "percentage difference"? Which one of the two is the 100% reference?
Do you want a new 2D array where each element is the difference of the second array compared to the first (or vice versa), expressed in percentages?
Do you want to know what percentage of array elements are different between the two arrays?
Do you want to know the average difference between all array elements?
All possible interpretations can be easily solved with very little code, but you need to explain in more detail what you actually want?
Here is a simple solution for case #2, for example (assuming the array have the same size, and we only want a rought estimate, rounded down to the nearest integer percent):
LabVIEW Champion . Do more with less code and in less time .
Attachments:
PCT-Difference.png ‏16 KB

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Message was edited by:
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