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Am I right to think that the expression "noise cancellation" is used for sound noise and "noise reduction" for image noise?

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    This question would be better if you explained why you think this is the case. – user3169 Jan 13 '15 at 4:32
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noise cancellation and noise reduction have technical definitions and both can refer to any electronic signal, whether audio, image or otherwise.

noise reduction is any technique used to filter out noise, while noise cancellation is the active electronic process of determining the part of the signal that is noise, then adding the opposite noise signal back into the original signal, thereby subtracting out the original noise.

(I'm a software engineer)

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Partially: "noise reduction" can be used at times for sounds as well.

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No. Noise cancellation and noise reduction can be used for sound and image. I presume by image noise you mean a noise made by an image on something like a tv screen?

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