In this embodiment, it only needs to determine line frequency for image capturing of the object by determining the distances between the first image capturing module and the object and between the line scan camera and the object respectively and determining the number of pixels on the imaging plane of the first image capturing module that the image of the object passes through per unit time, and control an image capturing frequency of 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. Thus, even if the speed of the object changes, the embodiment can facilitate to avoid deformation of images that may occur due to compression or stretch during the image capturing of the object.

FIG. 9 is a schematic flowchart of a method for controlling image capturing provided by the seventh embodiment of the present application. The embodiment is applicable to the situation where the linking line linking the lens of the first image capturing module and the lens of the second image capturing module is parallel or almost parallel to the direction of motion of the object. In other words, this embodiment is applicable to the situation where the distance h between the lens of the first image capturing module and the object and the distance H between the lens of the second image capturing module and the object is equal or almost equal.

Referring to FIG. 9, the embodiment of the method for controlling image capturing may include the following operations.

Step 901: Capturing images of an object in motion by the first image capturing module continuously.