An apparatus to measure noise in an image signal and a method thereof. The
apparatus includes an area division unit to divide an image signal having
noise therein into a plurality of areas and to output area information
corresponding to the plurality of areas, a variance calculation unit to
calculate variances of the plurality of areas using the area information,
the image signal and a noise-attenuated image signal obtained by
attenuating the noise from the image signal, and a noise determination
unit to determine an amount of noise in the image signal by comparing the
calculated variances of the plurality of areas. Accordingly, the noise
measurement apparatus can measure the amount of noise irrespective of
characteristics of the image signal, and thus noise attenuation can be
performed more accurately.