1. An image capturing method applied to a capturing apparatus that comprises a camera device, the method comprising: obtaining a preview image from the camera device; comparing the preview image with one or more pre-stored template images; determining that a moiré pattern exists in the preview image when a similarity between the preview image and one of the one or more pre-stored template images is equal to or greater than a predetermined value; adjusting a capturing parameter of the camera device when the moiré pattern exists in the preview image; and controlling the camera device to capture images when the capturing parameter has been adjusted.