DOUBLE STEREOSCOPIC SENSOR

Stereoscopic sensor (100, 100_n) comprising: a first camera pair (110) for capturing a first and a second image, which can be processed into a height image (170), wherein the stereoscopic sensor (100, 100_n) is adapted to monitor and define a main surveillance zone (150) in a surveillance plane (160) at a predetermined distance (D) from the stereoscopic sensor (100, 100_n), and the first camera pair (110) defines a first surveillance zone (151) with a primary coverage (155) in a first direction (161) from a projected mounting position (192) of the stereoscopic sensor (100, 100_1 - 100_n) and a secondary coverage (158) in a second direction (162) from the projected mounting position (192), wherein the first and second directions (156, 158) are oppositely directed, wherein the stereoscopic sensor (100, 100_n) further comprises a second camera pair (120), wherein the second camera pair (120) defines a second surveillance zone (152) with a primary coverage (156) in the surveillance plane (160) in the second direction (162) and a secondary coverage (157) in the first direction (161), wherein said secondary coverage (157; 158) of the first and the second camera pairs (110, 120) overlap the primary coverage (155; 156) of the other camera pair (110, 120) respectively.