Patent ID: 6967692
Filing Date: 2005-11-22
Classification: G09G,H04N

Abstract:
1. A luminance signal processing apparatus including: a window pulse generation means for generating a window pulse signal that indicates a period during which a luminance signal of an input video signal is sampled; a luminance value addition means for obtaining a total sum of luminance values of the luminance signal in the period indicated by the window pulse signal; a number-of-pixel addition means for obtaining the number of pixels in the period indicated by the window pulse signal; a bit shift means for detecting a significant bit from an output signal of the number-of-pixel addition means, and bit-shifting the output signal of the number-of-pixel addition means and an output signal of the luminance value addition means, respectively, on the basis of the significant bit; and a division means for dividing the bit-shifted output signal of the luminance value addition means, by the bit-shifted output signal of the number-of-pixel addition means, thereby obtaining an average luminance level in the period during which the luminance signal is sampled.