In complex imaging settings, optical scattering
often prohibits the formation of a clear target image, and instead,
only a speckle without the original spatial structure information is
obtained. Scattering seriously interferes with the locating of
targets; especially, when the scattering medium is dynamic, the
dynamic nature leads to rapid decorrelation of optical information in
time, and the challenge increases. Here, a locating method is proposed
to detect the target hidden behind a dynamic scattering medium, which
uses the a priori information of a known reference
object in the neighborhood of the target. The research further designs
an automatic calibration method to simplify the locating process, and
analyzes the factors affecting positioning accuracy. The proposed
method enables us to predict the position of a target from the
autocorrelation of the captured speckle pattern; the angle and
distance deviations of the target are all within 2.5%. This approach
can locate a target using only a single-shot speckle pattern, and it
is beneficial for target localization in dynamic scattering
conditions.
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