English: A gray-scale photography with different signal-to-noise ratios (SNRs). The SNR values are given for the rectangular region on the forehead. The plots at the bottom show the signal intensity in the indicated row of the image (red: original signal, blue: with noise).
Deutsch: Schwarz-weiß-Photographie mit unterschiedlichen Signal-Rausch-Verhältnissen. Die SNR-Werte beziehen sich auf die rechteckige Region auf der Stirn. Die Liniendiagramme zeigen die Signalintensität in der markierten Bildzeile (rot: Originalsignal, blau: mit Rauschen).
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