In order to accurately obtain the distance h between the object and the first image capturing module and the distance H between the object and the second image capturing module, in this embodiment, a ranging module, such as the ultrasonic ranging module or the laser ranging module, may be respectively selected to obtain the distance h between the first image capturing module and the object and the distance H between the second image capturing module and the object in real time respectively.
Step 806: controlling the second image capturing module according to the line frequency, so that the second image capturing module performs image capturing on the object with the line frequency.
In this embodiment, the second image capturing module is a line scan camera.
The line scan camera can be controlled according to the line frequency, that is, a pulse control signal is transmitted to the line scan camera, so that the line scan camera scans the object at the line frequency to obtain an image of the object.
In this embodiment, as an optional implementation, the direction of motion of the object is from the first image capturing module towards the second image capturing module.