<p>Suppose that we want to find the "largest level" of a random noise that can safely be added to an image such that the resultant noisy image cannot be distinguishable from the original noise-free image. For this purpose, we design the following subjective experiment:</p>

<p>Let I be the reference (noise-free) image. We first add a high level of noise to I to get a noisy image J. We then display I and J side by side, and ask a user to reduce the level of the noise in J gradually using a slider until he/she cannot distinguish between the reference image and the noisy image. The resultant level is then considered as the largest level of imperceptible noise for I.</p>

<p>But do you think that this experiment is technically sound? Also, can we use an adaptive procedure like QUEST to find the desired threshold/noise level? What do you think?</p>

<experimental-psychology><vision><psychophysics>
Finding largest level of imperceptible noise in an image
user2957386
# Finding largest level of imperceptible noise in an image

(Asked by: username_0 on 2018-09-08)

Suppose that we want to find the "largest level" of a random noise that can safely be added to an image such that the resultant noisy image cannot be distinguishable from the original noise-free image. For this purpose, we design the following subjective experiment:

Let I be the reference (noise-free) image. We first add a high level of noise to I to get a noisy image J. We then display I and J side by side, and ask a user to reduce the level of the noise in J gradually using a slider until he/she cannot distinguish between the reference image and the noisy image. The resultant level is then considered as the largest level of imperceptible noise for I.

But do you think that this experiment is technically sound? Also, can we use an adaptive procedure like QUEST to find the desired threshold/noise level? What do you think?

**Tags:** experimental-psychology, vision, psychophysics


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