November 2018
Intermediate to advanced
492 pages
12h 19m
English
Content preview from Hands-On Image Processing with Python
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How SNR changes with frequency cutoff
The following code block shows how to plot the change in signal to noise ratio (SNR) with cutoff frequency (F) for LPF:
snr = signaltonoise(im, axis=None)pylab.plot(ubs, snrs_lp, 'b.-')pylab.plot(range(25), [snr]*25, 'r-')pylab.xlabel('Cutoff Freqeuncy for LPF', size=20)pylab.ylabel('SNR', size=20)pylab.show()
The following screenshot shows how SNR of the output image decreases with the increase in the cut-off frequency of LPF. The red horizontal line indicates the original image's SNR, plotted for comparison:
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