Abstract
In the context of correspondence ghost imaging, we utilize the correlation
coefficients to separate the reference detector speckle patterns into positive and
negative correlated parts. A positive image and a negative image of the object are
obtained by averaging over corresponding speckle patterns. The visibility and
contrast-to-noise ratio of the positive image are discussed, and it is found that
the latter will reach a maximum by averaging over a little less than half of the
total number of reference speckle patterns.
© 2015 Chinese Optics Letters
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