Patent ID: 8339421

Claim:
An image processing apparatus for enlarging an input image, comprising: a first image enlarging unit configured to enlarge the input image and outputting a first enlarged image; a high-frequency component image generating unit configured to extract a high-frequency component of the input image and generating a first high-frequency component image; a second image enlarging unit configured to enlarge the first high-frequency component image and outputting a second enlarged image; and a high-frequency component image processing unit configured to extract a high-frequency component of the second enlarged image and generating a second high-frequency component image; wherein the high-frequencv component image processing unit determines a point where pixel values of pixels in the second enlarged image change from a positive value to a negative value, or from a negative value to a positive value as a zero crossing point, and amplifies the pixel values with an amplification factor, the amplification factor used for amplifying the pixel values of pixels in an area including the zero crossing point being larger than the amplification factor used for amplifying the pixel values of other pixels.