1. A method for increasing a detection range of an image capture system, wherein the image capture system comprises at least one first image capture unit, at least one second image capture unit, and a processor, the method comprising: the at least one first image capture unit capturing a first image, and the at least one second image capture unit capturing a second image; the processor determining an object according to the first image; the processor generating a third image group with a first resolution according to the first image and the second image; the processor generating a fourth image group with a second resolution according to the first image and the second image, or according to the third image group; the processor determining whether the object exists within an effective range of the image capture system corresponding to the second resolution, within a weak range of the image capture system corresponding to the second resolution, or within the effective range and the weak range of the image capture system corresponding to the second resolution to generate a determination result, wherein when a distance between the object and the image capture system is greater than a first predetermined distance, the object exists within the effective range or the weak range of the image capture system corresponding to the second resolution, and when the distance is less than the first predetermined distance, the object exists within a non-effective range of the image capture system corresponding to the second resolution; and the processor executing a corresponding operation according to the determination result.