How to find variance

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Marium Malik
Marium Malik 2012-4-17
What if my face detector detects faces to within 10 pixels of the actual face location 95% of the time. If we assume this error is Gaussian-distributed,how to get its variance? Total are 4 coordinates

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bym
bym 2012-4-17
unless I misunderstand your question, 95% is 1.96 standard deviations (two sided). You didn't mention if the 10 pixels are ±, so I assume it is the total variation. Then the variance is
(10/(2*1.96))^2
ans =
6.5077
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Marium Malik
Marium Malik 2012-4-18
Yes,it is the total variation. I didnt get why 1.96 is multiplied by 2?
Marium Malik
Marium Malik 2012-4-18
And how the standard deviation is calculated for 95%?

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