Patent ID: 7894686
Filing Date: 2011-02-22
Classification: G06T,H04N

Abstract:
1. An apparatus comprising: a first circuit configured to determine frequency of occurrence information for only a perceptual luminance range of gray levels from luminance data of an input signal, wherein (i) said input signal comprises a range of gray levels ranging from a minimum gray level value to a maximum gray level value, (ii) said perceptual luminance range of gray levels represents a visible region of said input signal ranging from a first predetermined gray level value to a second predetermined gray level value, (iii) a second range of gray levels that represents a black region of said input signal ranges from said minimum gray level value to said first predetermined gray level value, and (iv) a third range of gray levels that represents a white region of said input signal ranges from said maximum gray level value to said second predetermined gray level value; and a second circuit configured to selectively adjust one or more values for at least one portion of the luminance data of said input signal corresponding to the gray levels within the perceptual luminance range of grey levels based upon said frequency of occurrence information, wherein a gain of said second circuit is controlled based upon said frequency of occurrence information.