1. A method for calibrating the deviation of opto-electronic conversion functions (OECFs), suitable for calibrating the deviation of OECFs in an imaging apparatus, comprising: capturing a first image through the imaging apparatus; performing an image calibration with respect to the first image using the imaging apparatus to capture a second image and simultaneously obtain an opto-electronic conversion factor (OECF) set, wherein the OECF set includes at least an optical characteristic value of the second image and at least an electrical characteristic value of the imaging apparatus; and repeating the aforementioned steps to obtain a plurality of images and corresponding OECF sets.