Image processing apparatus, image pickup apparatus, and image processing method

An image pickup apparatus, comprising:

• an image pickup unit;
• and
• an image processing unit including
• a high-pass filter that extracts a high-frequency component of an input image supplied from the image pickup unit,
• an edge judgment unit that estimates an edge position in the input image from the high-frequency component of the input image extracted by the high-pass filter,
• a coordinate conversion unit that obtains an edge position in an enlarged image corresponding to the edge position estimated by the edge judgment unit,
• an interpolation unit that obtains a pixel value at each pixel position of an edge circumference of the enlarged image using a pixel value of the high-frequency component of the input image when an edge position of the high-frequency component of the input image and the edge position of the enlarged image overlap,
• a first enlargement processing unit that generates the enlarged image by enlarging the input image by a desired enlargement factor, and
• a synthesis unit that synthesizes the interpolated pixel value of the high-frequency component of the edge circumference and the pixel value of the pixel of the enlarged image.

An image processing method, comprising:

• extracting a high-frequency component of an input image;
• judging whether there is an edge in the input image based on the extracted high-frequency component of the input image and estimating an edge position when there is an edge;
• obtaining an edge position in an enlarged image obtained by enlarging the input image, the edge position corresponding to the estimated edge position;
• obtaining, regarding a position where an edge position of the high-frequency component of the input image and the edge position of the enlarged image overlap, a pixel value at each pixel position of an edge circumference of the enlarged image using a pixel value of the high-frequency component of the input image;
• and
• synthesizing the interpolated pixel value of the high-frequency component of the edge circumference and the pixel value of the pixel of the enlarged image.

An image processing apparatus, comprising:

• a high-pass filter configured to extract a high-frequency component of an input image;
• an edge judgment unit configured to judge whether there is an edge in the input image based on the high-frequency component of the input image extracted by the high-pass filter and estimate an edge position when there is an edge;
• a coordinate conversion unit configured to obtain an edge position in an enlarged image obtained by enlarging the input image, the edge position corresponding to the edge position estimated by the edge judgment unit;
• an interpolation unit configured to obtain, regarding a position where an edge position of the high-frequency component of the input image and the edge position of the enlarged image overlap, a pixel value at each pixel position of an edge circumference of the enlarged image using a pixel value of the input image;
• a first enlargement processing unit configured to generate the enlarged image by enlarging the input image by a desired enlargement factor;
• and
• a synthesis unit configured to synthesize the interpolated pixel value of the edge circumference and the pixel value of the pixel of the enlarged image.

An image pickup apparatus, comprising:

• an image pickup unit;
• and
• an image processing unit including
• a high-pass filter that extracts a high-frequency component of an input image supplied from the image pickup unit,
• an edge judgment unit that estimates an edge position in the input image from the high-frequency component of the input image extracted by the high-pass filter,
• a coordinate conversion unit that obtains an edge position in an enlarged image corresponding to the edge position estimated by the edge judgment unit,
• an interpolation unit that obtains a pixel value at each pixel position of an edge circumference of the enlarged image using a pixel value of the input image when an edge position of the high-frequency component of the input image and the edge position of the enlarged image overlap,
• a first enlargement processing unit that generates the enlarged image by enlarging the input image by a desired enlargement factor, and
• a synthesis unit that synthesizes the interpolated pixel value of the edge circumference and the pixel value of the pixel of the enlarged image.

An image processing method, comprising:

• extracting a high-frequency component of an input image;
• judging whether there is an edge in the input image based on the extracted high-frequency component of the input image and estimating an edge position when there is an edge;
• obtaining an edge position in an enlarged image obtained by enlarging the input image, the edge position corresponding to the estimated edge position;
• obtaining, regarding a position where an edge position of the high-frequency component of the input image and the edge position of the enlarged image overlap, a pixel value at each pixel position of an edge circumference of the enlarged image using a pixel value of the input image;
• and
• synthesizing the interpolated pixel value of the edge circumference and the pixel value of the pixel of the enlarged image.