Image processing apparatus, image processing method, image processing system, and storage medium

An apparatus comprising:

• a conversion unit configured to acquire a first converted image by converting resolution of a first image of a subject into first resolution and acquire a second converted image by converting resolution of a second image into the first resolution;
• an acquisition unit configured to acquire first deformation information for executing image registration between the first converted image and the second converted image with the first resolution;
• and
• a generation unit configured to generate a subtraction image based on second deformation information obtained such resolution in the first deformation information is converted into the resolution of the first image, the subtraction image showing a difference between the first image and the second image.

An apparatus comprising:

• a conversion unit configured to acquire a first converted image by converting resolution of a first image of a subject into first resolution and acquire a second converted image by converting resolution of a second image into the first resolution;
• a first generation unit configured to generate a subtraction image with the first resolution based on the first deformation information for executing image registration between the first converted image and the second converted image, the subtraction image showing a difference between the first converted image and the second converted image;
• and
• a second generation unit configured to generate a second subtraction image based on second deformation information obtained such that resolution in the first deformation information is converted into the resolution of the first image, the second subtraction image showing a difference between the first image and the second image.

A method comprising:

• acquiring a first converted image by converting resolution of a first image of a subject into first resolution and acquiring a second converted image by converting resolution of a second image into the first resolution;
• acquiring first deformation information for executing image registration between the first converted image and the second converted image with the first resolution;
• generating a first subtraction image based on the first deformation information in a case where the first resolution is selected, the first subtraction image showing a difference between the first converted image and the second converted image;
• and
• generating a second subtraction image based on second deformation information obtained such that resolution in the first deformation information is converted into the resolution of the first image, in a case where the resolution of the first image is selected, the second subtraction image showing a difference between the first image and the second image.

A non-transitory computer readable storage medium storing a program which causes a computer to execute a method comprising:

• acquiring a first converted image by converting resolution of a first image of a subject into first resolution and acquiring a second converted image by converting resolution of a second image into the first resolution;
• acquiring first deformation information for executing image registration between the first converted image and the second converted image with the first resolution;
• generating a first subtraction image based on the first deformation information in a case where the first resolution is selected, the first subtraction image showing a difference between the first converted image and the second converted image;
• and
• generating a second subtraction image based on second deformation information obtained such that resolution in the first deformation information is converted into the resolution of the first image, in a case where the resolution of the first image is selected, the second subtraction image showing a difference between the first image and the second image.