1. A deposition accuracy determination apparatus, comprising: a camera mounted inside the deposition accuracy determination apparatus and configured to capture an image of an organic emission layer previously disposed on a substrate; and a controller configured to: convert the image to a color profile; distinguish false measurement data from the color profile by determining a peak in a brightness profile as the false measurement data; generate data that excludes the brightness profile peak by excluding the false measurement data from the color profile; determine a center point of the organic emission layer by analyzing the data that excludes the brightness profile peak; and calculate an offset of a mask by comparing a reference center point of the substrate and the center point of the organic emission layer.