Patent ID: 8692906

Claim:
A luminance signal generation apparatus that generates a luminance signal according to an image signal constituted by color signals including a first color signal, comprising: a first luminance signal generation unit configured to generate a first luminance signal by interpolating the first color signal on pixels not corresponding to the first color signal; a second luminance signal generation unit configured to generate a second luminance signal by using the color signals as a raw luminance signal at pixel positions; a direction determination unit configured to determine a direction of an edge of the image signal and output an angle determination signal; a hierarchical image generation unit configured to generate, from the image signal, hierarchical image signals having different frequencies; a false color region detection unit configured to determine a false color region in each of the hierarchical image signals and output a false color region detection signal; a first selection unit configured to select one of the hierarchical image signals according to the false color region detection signal; and a mixing unit configured to mix the first and second luminance signals according to the angle determination signal and a chroma signal obtained from the selected one of the hierarchical image signals, thereby generating a third luminance signal.