1. An image capturing device, comprising: an image sensor, configured to obtain a target image, wherein the image sensor comprises: a color filter array, comprising a first region permitting visible light and infrared light to pass and a second region permitting the infrared light to pass; and a sensor chip, obtaining the target image by the color filter array, wherein the target image comprises: a composite image corresponding to the first region; a first group infrared image corresponding to the second region, wherein the composite image is composed of a RGB image and the second group infrared image; and a processor, generating a processed image by employing the first group infrared image, wherein under a normal mode, the processor retrieves the RGB image from the composite image by employing the first group infrared image and sets the retrieved RGB image as the processed image, and wherein under a glimmer mode, the processor adjusts the weight of the second group infrared image in the composite image by employing the first group infrared image to generate the processed image.