Provided is an apparatus of determining a defect pixel which includes at least one of a first edge periphery defect determiner and a second edge periphery defect determiner, wherein the first edge periphery defect determiner is configured to determine if a central pixel of a pixel group is the defect pixel by using pixel values of pixels adjacent to the central pixel disposed close to an image edge, wherein the edge includes at least one of right, left, upper, lower, lower-left, lower-right, upper-left and upper-right pixels of the central pixel, and wherein the second edge periphery defect determiner is configured to determine if the central pixel is the defect pixel by using a pixel disposed at at least one of the lower-left, lower-right, upper-left and upper-right of the central pixel.