1. A camera unit ( 14 ) adapted to be placed on board a drone ( 10 ), comprising: a camera of the rolling shutter type ( 16 ) including a digital sensor of a first, high resolution; and at least one camera of the global shutter type ( 18 ) including a digital sensor of a second, low resolution, lower than said first resolution, the rolling shutter camera and the at least one global shutter having their optical axes oriented in the same direction and being able to be triggered together so as to collect simultaneously a high-resolution image (I 0 ) and at least one low-resolution image (I 1 -I 4 ) of a same scene ( 12 ) viewed by the drone, image processing means ( 22 ), adapted to: determine distortions of the wobble type present in the high-resolution image and absent from the at least one low-resolution image; combine the high-resolution image (I 0 ) and the at least one low-resolution image (I 1 -I 4 ) to deliver as an output a high-resolution image (I′ 0 ) corrected for said distortions; construct ( 206 ) a representation of the scene from the at least one low-resolution image (I 1 -I 4 ); determine ( 212 ) the movements of the camera unit undergone for the duration of the high-resolution image (I 0 ) collection, from signals delivered by gyrometer, accelerometer and/or geolocation sensors; and project point by point ( 214 ), taking said movements into account, each pixel of the high-resolution image (I 0 ) as a texture on said representation of the scene constructed from the at least one low-resolution image (I 1 -I 4 ).