1. A calibration method of an image capture system, wherein the image capture system comprises at least one image capture device and a calibration unit, a device applied to the calibration method comprises an operation unit, a test pattern comprises a plurality of geometric blocks, and each geometric block of the plurality of geometric blocks has at least two sides and comprises one color, wherein colors of two adjacent geometric blocks of the plurality of geometric blocks are different, and two geometric blocks of the plurality of geometric blocks are not overlapped, the calibration method comprising: an image capture device of the at least one image capture device capturing an image comprising a plurality of intersection coordinates among the plurality of geometric blocks of the test pattern and a color information of the each geometric block of the plurality of geometric blocks of the test pattern; the operation unit executing a first operation on a plurality of intersection coordinates comprised in the image to generate a plurality of geometric calibration parameters; the operation unit executing a second operation on a color information corresponding to an interested area of each geometric block of a plurality of geometric blocks comprised in the image to simultaneously generate a plurality of color calibration parameters for different colors of the plurality of geometric blocks comprised in the image only through the test pattern; and the calibration unit executing geometric calibration and color calibration on the image capture device according to the plurality of geometric calibration parameters and the plurality of color calibration parameters corresponding to the test pattern together.