image processing – Correlated signal components from uncorrelated and incoherent source after reflection – Signal Processing Stack Exchange

image processing – Correlated signal components from uncorrelated and incoherent source after reflection – Signal Processing Stack Exchange

“To this point, it has been assumed that the point sources
composing the source are uncorrelated, generating fully
incoherent signals. Thus, capturing the reflected signals and after sufficient time averaging,
only the correlated signals components remain, and
cross-product terms between different point sources tend to zero.”

Where the correlated signal components came from as the sources are uncorrelated and fully
incoherent?

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