| Summary: | To retrieve an <italic>N</italic> pixel image of a scene, conventional digital cameras record the information using an <italic>N</italic> pixelated detector with one measurement, while single-pixel imaging achieves it by sampling the image in a particular basis and recording the light intensities of <italic>N</italic> temporal measurements with a single-pixel detector. Besides these two schemes, it is also possible to obtain the same spatial information with an <italic>X</italic> pixels detector and <italic>N</italic>/<italic>X</italic> measurements, where the pressure of information retrieval is distributed to both spatial and temporal domains, rather than condensed in one domain. In this paper, we investigate this possibility and present a 4-pixels imaging scheme, which retrieves an image partially in spatial domain and partially in temporal domain, by adopting a quadrant detector to a single-pixel imaging system. While yielding images with equal quality, the proof-of-principle system we built is four times faster than a standard single-pixel imaging system, demonstrating the feasibility of the proposed scheme. Our work exploits the flexibility of space-time information retrieval and can be useful for applications where comprise between spatial and temporal domains is needed.
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