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 pen lifting 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 comprises a second group infrared image, and the second group infrared image and the first group infrared image are linear correlated; and a processor, adjusting a proportion of the second group infrared image in the composite image by employing the first group infrared image, so as to generate a processed image.