Luminance signal generation apparatus, luminance signal generation method, image pickup apparatus, and storage medium
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United States of America Patent
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Apr 8, 2014
Grant Date -
Jan 19, 2012
app pub date -
Jul 13, 2011
filing date -
Jul 13, 2010
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Abstract
A luminance signal generation apparatus capable of suppressing an occurrence of aliasing at near horizontal and vertical Nyquist regions in the case of an achromatic object. An OG signal is generated by interpolating a green signal on pixels other than green pixels, and an SWY signal is generated as luminance signals at positions of pixels for respective colors. An angle determination signal is generated according to a direction of an edge of an image signal, and hierarchical image signals having different frequencies are generated from the image signal. Based on results of determination of false color region in the hierarchical image signals, one of the hierarchical image signals is selected. According to an angle determination signal and a chroma signal obtained from the selected hierarchical image signal, the OG signal and the SWY signal are mixed to generate a final luminance signal.
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