Image synthesizer, image synthesis method and computer readable recording medium having image synthesis processing program recorded thereon

An image stitching method for arranging a plurality of images to be stitched in m rows and n columns (m and n are natural numbers) on a monitor screen and stitching the plurality of images, the method comprising the steps of:

• setting the number of rows m and the number columns n to arrange the plurality of images to be stitched in m rows and n columns on the monitor screen, wherein m and n each have a value greater than 1;
• displaying on the monitor screen an image arrangement pattern selection screen including a plurality of image arrangement patterns each indicating how to arrange the plurality of images in the m rows and n columns;
• causing a user to select one of the plurality of image arrangement patterns on the image arrangement pattern selection screen;
• arranging the plurality of images to be stitched in m rows and n columns on the monitor screen in accordance with the image arrangement pattern selected by the user;
• causing the user to select one of image stitching modes for stitching the plurality of images arranged in the m rows and n columns on the monitor screen, wherein a first mode, a second mode and a third mode are previously prepared as the image stitching modes;
• automatically performing, when the first mode is selected, all of a first process for determining pairs of adjacent images between which an overlapped portion is to be extracted based on arrangement positions of the plurality of images, a second process for extracting the overlapped portion in each pair of adjacent images determined in the first process and for registering the two images of each pair based on the overlapped portion extracted in the pair, a third process for detecting corresponding points between the two images of each pair based on all the images registered in the second process, and a fourth process for finding geometric transform matrices for stitching all the images, from the corresponding points detected for each pair of adjacent images in the third process, and for stitching all the images using the geometric transform matrices;
• automatically performing the first process, the third process and the fourth process from among said first to fourth processes when the second mode is selected, and causing the user to manually register the overlapped portion between the two images of each pair instead of performing the second process;
• and
• automatically performing the first process and the fourth process from among said first to fourth processes when the third mode is selected, and causing the user to manually specify the corresponding points between the two images of each pair instead of performing the second and third processes.

A computer readable medium encoded with an image stitch processing program, for arranging a plurality of images to be stitched in m rows and n columns (m and n are natural numbers) on a monitor screen and stitching the plurality of images, wherein the program causes a computer to carry out the steps of:

• setting the number of rows m and the columns n to arrange the plurality of images to be stitched in m rows and n columns on the monitor screen, wherein m and n each have a value greater than 1;
• displaying on the monitor screen an image arrangement pattern selection screen including a plurality of image arrangement patterns each indicating how to arrange the plurality of images in the m rows and n columns;
• causing a user to select one of the plurality of image arrangement patterns on the image arrangement pattern selection screen;
• and
• arranging the plurality of images to be stitched in m rows and n columns on the monitor screen in accordance with the image arrangement pattern selected by the user;
• causing the user to select one of image stitching modes for stitching the plurality of images arranged in the m rows and n columns on the monitor screen, wherein a first mode, a second mode and a third mode are previously prepared as the image stitching modes;
• automatically performing, when the first mode is selected, all of a first process for determining pairs of adjacent images between which an overlapped portion is to be extracted based on arrangement positions of the plurality of images, a second process for extracting the overlapped portion in each pair of adjacent images determined in the first process and for registering the two images of each pair based on the overlapped portion extracted in the pair, a third process for detecting corresponding points between the two images of each pair based on all the images registered in the second process, and a fourth process for finding geometric transform matrices for stitching all the images, from the corresponding points detected for each pair of adjacent images in the third process, and for stitching all the images using the geometric transform matrices;
• automatically performing the first process, the third process and the fourth process from among said first to fourth processes when the second mode is selected, and causing the user to manually register the overlapped portion between the two images of each pair instead of performing the second process;
• and
• automatically performing the first process and the fourth process from among said first to fourth processes when the third mode is selected, and causing the user to manually specify the corresponding points between the two images of each pair instead of performing the second and third processes.

An image stitching method comprising:

• a first step of arranging a plurality of images in a two-dimensional manner such that their respective arrangement positions conform to an actual relative positional relationship;
• a second step of automatically arranging all the images arranged in a two-dimensional manner in such a one-dimensional manner that the adjacent images have an overlapped portion;
• and
• a third step of determining the adjacent images on the basis of the images arranged in a one-dimensional manner and stitching the adjacent images to obtain a composite image of all images in order for the composite image to be displayed on a monitor,
• the second step comprising the steps of
• registering for each of the images arranged in a two-dimensional manner information related to the adjacent images having an overlapped portion comprising information for specifying the adjacent images and information related to the distances between the center of the image and the centers of the adjacent images,
• searching for a route which satisfies conditions under which the adjacent images having an overlapped portion are connected to each other and along which all the images can be drawn with one stroke using the information related to the adjacent images which is registered for each of the images, and
• arranging, when the route which satisfies conditions under which the adjacent images are connected to each other and along with all the images can be drawn with one stroke can be searched for, all the images in a one-dimensional manner in accordance with the route searched for.