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How to image scenes or detect objects hidden from view has been of increasing interest in recent years. Previous studies have demonstrated non-line-of-sight object reconstruction by using time-resolved detectors and a back-projection algorithm, whereas the filtered back-projection method reconstructs high-frequency spatial information, such as the edge of an object, with poor quality. Here we propose an optimized back-projection algorithm to improve the object edge reconstruction quality. We base our method on the observation that the spa