Image processing apparatus and method, and program

An image processing method for use in an image processing apparatus including a normal-phase candidate position selection unit for selecting a position different from a target position on an input image as a normal-phase candidate position, which is a candidate for a position at which jaggies are in the same phase as the target position, a reverse-phase candidate position selection unit for selecting a position different from the target position on the input image as a reverse-phase candidate position, which is a candidate for a position at which jaggies are in a reverse phase to the target position, a weight value calculation unit for calculating a weight value based on a degree of similarity between an image of the target position and an image of the normal-phase candidate position, and a weighted expected value calculation unit for calculating a weighted expected value based on the weight value and a pixel of the reverse-phase candidate position, the method comprising:

• selecting, by the normal-phase candidate position selection unit, the normal-phase candidate position;
• selecting, by the reverse-phase candidate position selection unit, the reverse-phase candidate position;
• calculating, by the weight value calculation unit, the weight value;
• and
• calculating, by the weighted expected value calculation unit, the weighted expected value.

A program for causing a computer to execute a process comprising:

• selecting a position different from a target position on an input image as a normal-phase candidate position, which is a candidate for a position at which jaggies are in the same phase as the target position;
• selecting a position different from the target position on the input image as a reverse-phase candidate position, which is a candidate for a position at which jaggies are in a reverse phase to the target position;
• calculating a weight value based on a degree of similarity between an image of the target position and an image of the normal-phase candidate position;
• and
• calculating a weighted expected value based on the weight value and a pixel of the reverse-phase candidate position.

An image processing apparatus comprising:

• a reverse-phase candidate position selection unit for selecting a position different from a target position on an input image as a reverse-phase candidate position, which is a candidate for a position at which jaggies are in a reverse phase to the target position;
• a smoothing unit for generating a smoothed image by smoothing the input image;
• a weight value calculation unit for calculating a weight value based on a first degree of similarity between an image of the target position on the smoothed image and an image of the reverse-phase candidate position on the smoothed image;
• and
• a weighted expected value calculation unit for calculating a weighted expected value based on a pixel of the reverse-phase candidate position on the input image and the weight value.

An image processing method for use in an image processing apparatus including a reverse-phase candidate position selection unit for selecting a position different from a target position on an input image as a reverse-phase candidate position, which is a candidate for a position at which jaggies are in a reverse phase to the target position, a smoothing unit for generating a smoothed image by smoothing the input image, a weight value calculation unit for calculating a weight value based on a degree of similarity between an image of the target position on the smoothed image and an image of the reverse-phase candidate position on the smoothed image, and a weighted expected value calculation unit for calculating a weighted expected value based on a pixel of the reverse-phase candidate position on the input image and the weight value, the method comprising:

• selecting, by the reverse-phase candidate position selection unit, the reverse-phase candidate position;
• generating, by the smoothing unit, the smoothed image;
• calculating, by the weight value calculation unit, the weight value;
• and
• calculating, by the weighted expected value calculation unit, the weighted expected value.

A program for causing a computer to execute a process comprising:

• selecting a position different from a target position on an input image as a reverse-phase candidate position, which is a candidate for a position at which jaggies are in a reverse phase to the target position;
• generating a smoothed image by smoothing the input image;
• calculating a weight value based on a degree of similarity between an image of the target position on the smoothed image and an image of the reverse-phase candidate position on the smoothed image;
• and
• calculating a weighted expected value based on a pixel of the reverse-phase candidate position on the input image and the weight value.

An image processing apparatus comprising:

• a reverse-phase candidate position selection unit for selecting a position different from a target position on an input image as a reverse-phase candidate position, which is a candidate for a position at which jaggies are in a reverse phase to the target position;
• a weight value calculation unit for calculating a weight value based on a degree of angular similarity between an image of the target position and an image of the reverse-phase candidate position;
• and
• a weighted expected value calculation unit for calculating a weighted expected value based on a pixel of the reverse-phase candidate position and the weight value.

An image processing method for use in an image processing apparatus including a reverse-phase candidate position selection unit for selecting a position different from a target position on an input image as a reverse-phase candidate position, which is a candidate for a position at which jaggies are in a reverse phase to the target position, a weight value calculation unit for calculating a weight value based on a degree of angular similarity between an image of the target position and an image of the reverse-phase candidate position, and a weighted expected value calculation unit for calculating a weighted expected value based on a pixel of the reverse-phase candidate position and the weight value, the method comprising:

• selecting, by the reverse-phase candidate position selection unit, the reverse-phase candidate position;
• calculating, by the weight value calculation unit, the weight value;
• and
• calculating, by the weighted expected value calculation unit, the weighted expected value.

A program for causing a computer to execute a process comprising:

• selecting a position different from a target position on an input image as a reverse-phase candidate position, which is a candidate for a position at which jaggies are in a reverse phase to the target position;
• calculating a weight value based on a degree of angular similarity between an image of the target position and an image of the reverse-phase candidate position;
• and
• calculating a weighted expected value based on a pixel of the reverse-phase candidate position and the weight value.

An image processing apparatus comprising:

• a reverse-phase candidate position pair selection unit for selecting two points different from a target position on an input image as a pair of reverse-phase candidate positions, which are candidates for a position at which jaggies are in a reverse phase to the target position, point-symmetrically with respect to the target position;
• a weight value calculation unit for calculating a weight value based on a degree of similarity of images between the two points serving as the reverse-phase candidate positions;
• and
• a weighted expected value calculation unit for calculating a weighted expected value based on pixels of the reverse-phase candidate positions on the input image and the weight value.

An image processing method for use in an image processing apparatus including a reverse-phase candidate position pair selection unit for selecting two points different from a target position on an input image as a pair of reverse-phase candidate positions, which are candidates for a position at which jaggies are in a reverse phase to the target position, point-symmetrically with respect to the target position, a weight value calculation unit for calculating a weight value based on a degree of similarity of images between the two points serving as the reverse-phase candidate positions, and a weighted expected value calculation unit for calculating a weighted expected value based on pixels of the reverse-phase candidate positions on the input image and the weight value, the method comprising:

• selecting, by the reverse-phase candidate position pair selection unit, the reverse-phase candidate position pair;
• calculating, by the weight value calculation unit, the weight value;
• and
• calculating, by the weighted expected value calculation unit, the weighted expected value.