1. A fingerprint identification method, comprising: obtaining an object image, and storing a plurality of pixel data of the object image in a first color model format, wherein the pixel data comprise a plurality of first pixel values; converting the pixel data into a second color model format, and obtaining a plurality of second pixel values based on the converted pixel data and a first gain value; calculating a plurality of third pixel values based on the first pixel values and the second pixel values; calculating a first standard deviation based on the third pixel values; and determining whether the first standard deviation being greater than a first preset threshold value, if the first standard deviation being greater than the first preset threshold value, recognizing the object image as a fingerprint image of a true finger.