For active optical imaging, the use of single-photon detectors can greatlyimprove the detection sensitivity of the system. However, the traditionalmaximum-likelihood based imaging method needs a long acquisition time tocapture clear three-dimensional (3D) image in low light-level. To tackle thisproblem, we present a novel imaging method for depth estimate, which can obtainthe accurate 3D image in a short acquisition time. Our method combines thephoton-count statistics with the temporal correlations of the reflected signal.According to the characteristics of the target surface, including the surfacereflectivity, our method is capable of adaptively changing the dwell time ineach pixel. The experimental results demonstrate that the proposed method canfast obtain the accurate depth image despite the existence of strong backgroundnoise.
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