Patent ID: 7450776

Claim:
A gradation attributes correcting device to correct gradation attributes of an input image signal for creating an output image on a frame, comprising: a brightness gradation correcting unit to correct gradation attributes with respect to brightness of the output image on the frame indicated by the input image signal, the brightness gradation correcting unit including: a characteristic information acquisition unit to acquire a minimum brightness, an average brightness and a maximum brightness of the output image on the frame from the input image signal; a correction information decision unit to determine correction information to correct the gradation attributes with respect to brightness according to a combination of the acquired minimum brightness, average brightness and maximum brightness of the output image on the frame; and a brightness gradation correction processing unit to establish a polynomial function for the output image on the frame based on the correction information to correct the gradation attributes of the input signal for creating the output image on the frame with respect to brightness by arithmetic operation using the polynomial function for the output image on the frame.