An image stitching method configured to stitch images of an animal eye fundus is provided. The image stitching method includes: obtaining a plurality of images from the animal eye fundus, wherein the images of the animal eye fundus partially overlap converting the eye fundus images into a plurality of grayscale images enhancing the contrast of the grayscale images comparing the enhanced grayscale images so as to obtain a plurality of stitching data and stitching the eye fundus images according to the stitching data. Besides, a camera system is also provided.一種拼接影像的方法,適於拼接一動物的眼睛底部的影像。拼接影像的方法包括:擷取動物的多個眼底影像,其中這些眼底影像部分重疊;將這些眼底影像分別轉換為多個灰階影像;提高這些灰階影像的對比;比較被提高對比的這些灰階影像,以得到多個拼接數據;根據這些拼接數據拼接這些眼底影像。此外,一種攝像系統亦被提供。S100、S200、S300、S400、S500‧‧‧步驟
