Noise

Why do we need to write the noise as randn(2,1)./sqrt(2*SNR) instead of randn(1,1)/sqrt(2)?

Why do we need to write the noise as randn(2,1)./sqrt(2*SNR) instead of randn(1,1)/sqrt(2)?
  1. How to use SNR in Matlab?
  2. How to detect noise in an image using matlab?

How to use SNR in Matlab?

r = snr( xi , y ) returns the signal-to-noise ratio (SNR) in decibels of a signal, xi , by computing the ratio of its summed squared magnitude to that of the noise y : r = mag2db ( rssq ( xi (:))/ rssq ( y (:))) .

How to detect noise in an image using matlab?

There is a button that will process all images selected in the listbox - you insert that custom code into the AnalyzeSingleImage() function. Your custom code can then read in the image and determine what kind of noise is there and do whatever kind of noise removal you think would improve the image.

Power Compute SNR of a signal with not clear fundamental frequency in PSD
Compute SNR of a signal with not clear fundamental frequency in PSD
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Response Impulse response from the transfer function
Impulse response from the transfer function
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Time Algorithm to detect down-up-down pattern in time series
Algorithm to detect down-up-down pattern in time series
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