Patent ID: 7379057

Claim:
A nonlinear processing device comprising: nonlinear processing means for correcting a video signal for signal level by nonlinear processing according to display characteristics of an image display unit for generating an image display based on the video signal; horizontal and vertical position determining means for determining a position in a horizontal direction and a vertical direction of a pixel in said video signal; level determining means for determining signal level of the pixel in said video signal; level boundary setting means for variably setting a level boundary value used in determination by said level determining means; wherein the level boundary value is arbitrarily and variably set according to a first writing control signal sent by a CPU, boundary value offsetting means for supplying an offset value to said level determining means and thereby offsetting the level boundary value set to be used for determination by said level determining means; wherein an optimum offset value is set for the offset value according to a second writing control signal sent by the CPU, three-dimensional correction means for generating a three-dimensional signal level correction value according to the position in the horizontal direction and the vertical direction determined by said horizontal and vertical position determining means and the signal level determined by said level determining means, and thereby generating three-dimensional correction of the video signal; and combining means for combining the video signal corrected by said nonlinear processing means with the video signal corrected by said three-dimensional correction means for output.