Image processing apparatus and control method thereof

摘要

In an image processing apparatus, a reduced image in which an input image having a color pattern of a plurality of colors of different pixel densities is reduced is generated. A luminance signal is generated from the reduced image. A contour compensation signal is generated from weighted color signals of the reduced image. The luminance signal and the contour compensation signal are combined. If a reduction ratio of the reduced image is greater than a threshold, a weighting used for a color signal for which a pixel density is high in the input image is increased in comparison to a case where the reduction ratio is not greater to the threshold.

主权项

1. An image processing apparatus, comprising:
reduction means for generating a reduced image of an input image having a Bayer pattern; luminance signal generation means for generating a first luminance signal based on the reduced image; color signal generation means for generating a color signal from the reduced image; conversion means for converting the first luminance signal into a second luminance signal; contour compensation signal generation means for generating a contour compensation signal based on the first luminance signal; and combination means for combining the second luminance signal and the contour compensation signal; wherein when a reduction ratio that indicates a ratio of a number of pixels of the reduced image with respect to the input image is greater than a threshold, said luminance signal generation means generates the first luminance signal in which a composition ratio between Red, Green, and Blue components included in the Bayer pattern has a first ratio, and when the reduction ratio is less than or equal to the threshold, said luminance signal generation means generates the first luminance signal in which the composition ratio has a second ratio, wherein the first ratio has a ratio of the Green component greater than that of the second ratio, and wherein when the reduction ratio is greater than the threshold, said conversion means converts the first luminance signal into the second luminance signal by adding the color signal to the first luminance signal, and when the reduction ratio is less than or equal to the threshold, said conversion means outputs the first luminance signal as the second luminance signal.