This work can derive a very accurate transmission map for single image dehazing. The superiority comes from:
To address the computational burden, recently we develop a multiscale framework to accelerate cpu time by 10 times. The basic idea is
 The gradient responses of transmission map (xaxis) vs. probability (yaxis). We assume it follows Gaussian distribution and in different scales, we control the selected range for update by its mean and standard derivation .

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