A device (200, 400, 500, 900) for use with a vehicle-mounted image acquisition unit, the device comprising: a main body (201, 401, 501, 901) including a first end (210, 410, 510, 910) and a second end (220, 420, 520, 920) opposite to the first end (210, 410, 510, 910), wherein the main body (201, 401, 501, 901) further defines: an interior cavity (230, 430, 530, 930) extending between the first end (210, 410, 510, 910) and the second end (220, 420, 520, 920); and a plurality of apertures (240, 440, 540, 940) through the main body (201, 401, 501, 901) to the interior cavity between the first end (210, 410, 510, 910) and the second end (220, 420, 520, 920), and wherein the first end (210, 410, 510, 910) of the main body (201, 401, 501, 901) is configured to be disposed at or near the vehicle-mounted image acquisition unit, such that a field of view of the vehicle-mounted image acquisition unit is determined, which is extending through the interior cavity (230, 430, 530, 930) and through the second end (220, 420, 520, 920) to an outside environment surrounding a vehicle, characterized in that the plurality of apertures (240, 440, 540, 940) are arranged in a plurality of circumferential rows (245, 445, 545) spaced apart from each other along a length of the main body (201, 401, 501, 901). a main body (201, 401, 501, 901) including a first end (210, 410, 510, 910) and a second end (220, 420, 520, 920) opposite to the first end (210, 410, 510, 910), wherein the main body (201, 401, 501, 901) further defines: an interior cavity (230, 430, 530, 930) extending between the first end (210, 410, 510, 910) and the second end (220, 420, 520, 920); and a plurality of apertures (240, 440, 540, 940) through the main body (201, 401, 501, 901) to the interior cavity between the first end (210, 410, 510, 910) and the second end (220, 420, 520, 920), and wherein the first end (210, 410, 510, 910) of the main body (201, 401, 501, 901) is configured to be disposed at or near the vehicle-mounted image acquisition unit, such that a field of view of the vehicle-mounted image acquisition unit is determined, which is extending through the interior cavity (230, 430, 530, 930) and through the second end (220, 420, 520, 920) to an outside environment surrounding a vehicle, characterized in that the plurality of apertures (240, 440, 540, 940) are arranged in a plurality of circumferential rows (245, 445, 545) spaced apart from each other along a length of the main body (201, 401, 501, 901). an interior cavity (230, 430, 530, 930) extending between the first end (210, 410, 510, 910) and the second end (220, 420, 520, 920); and a plurality of apertures (240, 440, 540, 940) through the main body (201, 401, 501, 901) to the interior cavity between the first end (210, 410, 510, 910) and the second end (220, 420, 520, 920), and wherein the first end (210, 410, 510, 910) of the main body (201, 401, 501, 901) is configured to be disposed at or near the vehicle-mounted image acquisition unit, such that a field of view of the vehicle-mounted image acquisition unit is determined, which is extending through the interior cavity (230, 430, 530, 930) and through the second end (220, 420, 520, 920) to an outside environment surrounding a vehicle, characterized in that the plurality of apertures (240, 440, 540, 940) are arranged in a plurality of circumferential rows (245, 445, 545) spaced apart from each other along a length of the main body (201, 401, 501, 901).