An imaging system, comprising: a pixel array, wherein a reflected signal is incident on the pixel array to form a plurality of reflected light spots separated from each other on the pixel array; the pixel array comprises: a plurality of pixels (430, 530, PXA, PXB, PX1-PX8) arranged in rows and columns, the pixels (430, 530, PXA, PXB, PX1-PX8) configured to sense the reflected signal, the pixel array being characterized in that each of the pixels (430, 530, PXA, PXB, PX1-PX8) comprises: a photodetector (432, PDA, PDB, PD), configured to detect the reflected signal and accordingly output a photo response signal (DRA, DRB); and a readout circuit (RDA, RDB, RD), coupled to the photodetector (432, PDA, PDB, PD), the readout circuit (RDA, RDB, RD) being configured to generate a pixel output (POA, POB, PO) according to the photo response signal (DRA, DRB); wherein respective photodetectors (432, PDA, PDB, PD) of a group of pixels of the pixels (430, 530, PXA, PXB, PX1-PX8) disposed along a first predetermined direction, which is either a row direction or a column direction, are arranged in a staggered manner in a second predetermined direction perpendicular to the first predetermined direction; the group of pixels (430, 530, PXA, PXB, PX1-PX8) comprise a first pixel (430, 530, PXA, PXB, PX1-PX8) and a second pixel (430, 530, PXA, PXB, PX1-PX8) adjacent to the first pixel (430, 530, PXA, PXB, PX1-PX8) in the first predetermined direction; the readout circuit (RDA, RDB, RD) of the first pixel (430, 530, PXA, PXB, PX1-PX8) is adjacent to the photodetector (432, PDA, PDB, PD) of the second pixel (430, 530, PXA, PXB, PX1-PX8) along the first predetermined direction, and is adjacent to the photodetector (432, PDA, PDB, PD) of the first pixel (430, 530, PXA, PXB, PX1-PX8) along the second predetermined direction; wherein the photodetector (432, PDA, PDB, PD) of the first pixel (430, 530, PXA, PXB, PX1-PX8) is disposed at a first side of the readout circuit (RDA, RDB, RD) of the first pixel (430, 530, PXA, PXB, PX1-PX8) along the second predetermined direction; the photodetector (432, PDA, PDB, PD) of the second pixel (430, 530, PXA, PXB, PX1-PX8) is disposed immediately adjacent to the readout circuit of the second pixel, and is disposed at a second side of the readout circuit (RDA, RDB, RD) of the second pixel (430, 530, PXA, PXB, PX1-PX8) opposite to the first side along the second predetermined direction. a photodetector (432, PDA, PDB, PD), configured to detect the reflected signal and accordingly output a photo response signal (DRA, DRB); and a readout circuit (RDA, RDB, RD), coupled to the photodetector (432, PDA, PDB, PD), the readout circuit (RDA, RDB, RD) being configured to generate a pixel output (POA, POB, PO) according to the photo response signal (DRA, DRB); wherein respective photodetectors (432, PDA, PDB, PD) of a group of pixels of the pixels (430, 530, PXA, PXB, PX1-PX8) disposed along a first predetermined direction, which is either a row direction or a column direction, are arranged in a staggered manner in a second predetermined direction perpendicular to the first predetermined direction; the group of pixels (430, 530, PXA, PXB, PX1-PX8) comprise a first pixel (430, 530, PXA, PXB, PX1-PX8) and a second pixel (430, 530, PXA, PXB, PX1-PX8) adjacent to the first pixel (430, 530, PXA, PXB, PX1-PX8) in the first predetermined direction; the readout circuit (RDA, RDB, RD) of the first pixel (430, 530, PXA, PXB, PX1-PX8) is adjacent to the photodetector (432, PDA, PDB, PD) of the second pixel (430, 530, PXA, PXB, PX1-PX8) along the first predetermined direction, and is adjacent to the photodetector (432, PDA, PDB, PD) of the first pixel (430, 530, PXA, PXB, PX1-PX8) along the second predetermined direction; wherein the photodetector (432, PDA, PDB, PD) of the first pixel (430, 530, PXA, PXB, PX1-PX8) is disposed at a first side of the readout circuit (RDA, RDB, RD) of the first pixel (430, 530, PXA, PXB, PX1-PX8) along the second predetermined direction; the photodetector (432, PDA, PDB, PD) of the second pixel (430, 530, PXA, PXB, PX1-PX8) is disposed immediately adjacent to the readout circuit of the second pixel, and is disposed at a second side of the readout circuit (RDA, RDB, RD) of the second pixel (430, 530, PXA, PXB, PX1-PX8) opposite to the first side along the second predetermined direction.