Information processor, information processing method, and computer readable medium

A computer readable medium storing a program causing a computer to execute a process for a position alignment for images, the process comprising:

• sequentially moving a first image from a reference position to multiple first positions, in which displacements in a reference direction between the reference position and the multiple first positions are multiples of a reference distance, by performing a first process including at least one geometric transformation process for the first image;
• comparing the first image having been subjected to the first process with a second image each time the first process is performed;
• selecting a target first position from among the multiple first positions based on the comparing the first image having been subjected to the first process with a second image each time the first process is performed;
• sequentially moves the first image from the reference position to multiple second positions, in which displacements in the reference direction between the target first position and the multiple second positions are smaller than the reference distance, by performing a second process including at least one geometric transformation process for the first image after the target first position is selected;
• comparing the first image having been subjected to the second process with the second image each time the second process is performed;
• selecting a target second position from among the multiple second positions based on the comparing the first image having been subjected to the second process with the second image each time the second process is performed;
• and
• aligning the positions of the first image and the second image by performing a geometric transformation process for the first image based on the difference between the reference position and the target second position.

An information processing method comprising:

• sequentially moving a first image from a reference position to multiple first positions, in which displacements in a reference direction between the reference position and the multiple first positions are multiples of a reference distance, by performing a first process including at least one geometric transformation process for the first image;
• comparing the first image having been subjected to the first process with a second image each time the first process is performed;
• selecting a target first position from among the multiple first positions based on the comparing the first image having been subjected to the first process with a second image each time the first process is performed;
• sequentially moves the first image from the reference position to multiple second positions, in which displacements in the reference direction between the target first position and the multiple second positions are smaller than the reference distance, by performing a second process including at least one geometric transformation process for the first image after the target first position is selected;
• comparing the first image having been subjected to the second process with the second image each time the second process is performed;
• selecting a target second position from among the multiple second positions based on the comparing the first image having been subjected to the second process with the second image each time the second process is performed;
• and
• aligning the positions of the first image and the second image by performing a geometric transformation process for the first image based on the difference between the reference position and the target second position.