To provide a data conversion method of a display device matched to human visual features.

A method of limiting a filter kernel divisor is provided, which is a method of limiting the filter kernel divisor in a filter kernel to a value designed so as to simplify hardware implementations, and the method includes calculating areas for filter coefficients using a floating point arithmetic and then dividing each filter coefficient by a total area of a display area to receive a first product, then multiplying the first product by a certain divisor to produce a filter sum, performing binary search to find a rounding off point of the filter sum, and converting the filter sum into integers.