A luminance average calculation part 5 and a color difference average calculation part 6 calculate an average value AVy of luminance signal and an average value AVc of color difference signal, respectively. 輝度平均値算出部5及び色差平均値算出部6で、輝度信号の平均値AVy及び色差信号の平均値AVcを算出する。 - 特許庁
A noise estimation part 7 outputs, based on the relation among input pixel luminance signal level, luminance and shot noise of color difference signal, a luminance noise estimated value and a color difference noise estimated value according to the average value AVy of luminance signal from the calculation part 5. ノイズ推定部7で、入力画素輝度信号レベルと輝度及び色差信号のショットノイズとの関係に基づいて、輝度平均値算出部5からの輝度信号の平均値AVyに応じた輝度ノイズ推定値及び色差ノイズ推定値をそれぞれ出力する。 - 特許庁