Patent ID: 7477303
Filing Date: 2009-01-13
Classification: H04N

Abstract:
1. A digital video signal processing apparatus for modifying an amplitude level of said digital video signal according to a non-linear curve comprising: low pass filter means to which said digital video signal is supplied to produce a filtered digital video signal; coefficient generating means for generating a multiplying coefficient and an adding coefficient from a respective linear expression of one of line segments of the non-linear curve, each of said line segments being expressed by dividing said non-linear curve into a plurality of sections and replacing each of said sections with a respective line segment which can be expressed as a linear expression to form a succession of line segments; multiplying means for multiplying said amplitude level of said digital video signal by said multiplying coefficient; and adding means for adding an output of said multiplying means and said adding coefficient, wherein the filtered digital video signal that has a frequency higher than a predetermined frequency is attenuated in the low pass filter means to have an amplitude smaller than a deviation between two successive sampling points on the non-linear curve.