Image processing device, image processing method and medium

An image processing method for an image processing device comprising:

• determining an area where a feature value of an input image is saved, based on a gradient of a feature value of a pixel of the input image and a direction of the gradient, and calculating a weight for reducing a regularization constraint that is a constraint based on regularization of image processing in the area where the feature value is saved;
• calculating a regularization constraint of a high resolution image restored based on the input image by using the weight;
• calculating a reconstruction constraint that is a constraint based on reconstruction of the high resolution image;
• and
• restoring the high resolution image from the input image based on the regularization constraint and the reconstruction constraint.

A computer-readable non-transitory recording medium embodying a program for an image processing device to perform method, the method comprising:

• determining an area where a feature value of an input image is saved, based on a gradient of a feature value of a pixel of the input image and a direction of the gradient, and calculating a weight for reducing a regularization constraint that is a constraint based on regularization of image processing in the area where the feature value is saved;
• calculating a regularization constraint of a high resolution image restored based on the input image by using the weight;
• calculating a reconstruction constraint that is a constraint based on reconstruction of the high resolution image;
• and
• restoring the high resolution image from the input image based on the regularization constraint and the reconstruction constraint.

An image processing device comprising:

• a CPU;
• and
• a memory that includes a program, wherein
• the CPU reads the program from the memory and executes functions as:
• a weight calculator that calculates a weight for reducing a regularization constraint that is a constraint based on regularization of image processing in a texture area of an input image;
• a regularization term calculator that calculates the regularization constraint by using the weight in the texture area and not using the weight in an area other than the texture area;
• and
• an image restorer that restores a high resolution image based on the regularization constraint and a reconstruction constraint that is a constraint based on reconstruction of the high resolution image.

An image processing method for an image processing device comprising:

• calculating a weight for reducing a regularization constraint that is a constraint based on regularization of image processing in a texture area of an input image;
• calculating the regularization constraint by using the weight in the texture area and not using the weight in an area other than the texture area;
• and
• restoring a high resolution image based on the regularization constraint and a reconstruction constraint that is a constraint based on reconstruction of the high resolution image.

A computer-readable non-transitory recording medium embodying a program for an image processing device to perform method, the method comprising:

• calculating a weight for reducing a regularization constraint that is a constraint based on regularization of image processing in a texture area of an input image;
• calculating the regularization constraint by using the weight in the texture area and not using the weight in an area other than the texture area;
• and
• restoring a high resolution image based on the regularization constraint and a reconstruction constraint that is a constraint based on reconstruction of the high resolution image.