Image processor and computer readable medium

An image processor comprising:

• a storing unit that stores information about first partial images in a first image, wherein an order of the first partial images is determined in accordance with positions of the first partial images extracted from the first image;
• a partial image extracting unit that extracts second partial images from a second image;
• a sequencing unit that determines an order of the extracted second partial images in accordance with positions of the second partial images in the second image;
• and
• a difference extracting unit that compares each first partial image with the corresponding second partial image in accordance with the stored information of the first partial image and the order of the second partial image and extracts a difference based on the comparison between the first image and the second image.

A computer readable medium storing a program causing a computer to execute a process for image processing, the process comprising:

• extracting first partial images from a first image;
• extracting second partial images from a second image;
• determining an order of the extracted first partial images in accordance with positions of the first partial images in the first image;
• determines an order of the extracted second partial images in accordance with positions of second partial images in the second image;
• comparing each first partial image with the corresponding second partial image in accordance with the order of the first partial images and the order of the second partial images;
• and
• extracting a difference based on the comparison between the first image and the second image.

A computer readable medium storing a program causing a computer to execute a process for image processing, the process comprising:

• storing information about first partial images in a first image, wherein an order of the first partial images is determined in accordance with positions of the first partial images extracted from the first image;
• extracting second partial images from a second image;
• determining an order of the extracted second partial images in accordance with a positions of the second partial image in the second image;
• comparing each first partial image with the corresponding second partial image in accordance with the stored information of the first partial image and the order of the second partial image;
• and
• extracting a difference based on the comparison between the first image and the second image.