Image compositing device, recording medium, and program

A computer-readable recording medium storing a program that has a computer composite images together into a final composite image, the images including a video image and a plurality of graphical images, the program comprising:

• a first obtaining step for obtaining the graphical images and composition information that includes an image compositing order, the composition information being used for calculating a composition ratio of each of the images to the final composite image;
• the composition information further includes a composition coefficient for each of the images, each composition coefficient indicating a composition ratio of one of the images to a composite of the image with at least another one of the images;
• a first compositing step for compositing the graphical images to generate one composite graphical image according to the composition information;
• a calculating step for calculating a composition ratio of the video image to the final composite image according to the composition information;
• a second obtaining step for obtaining frames of the video image;
• a second compositing step for compositing one of the obtained frames at a time with the composite graphical image using the composition ratio of the video image;
• wherein the image compositing order indicates a first overlaying order of the images, the composition coefficients are α values, each of which indicates a composition ratio of one of the images to a composite of the image with images below the image in the first overlaying order, and the calculating step calculates the composition ratio of the video image to the final composite image from α values of the video image and images above the video image in the first overlaying order;
• a switching step for rearranging two adjacent images in the first overlaying order into a second overlaying order;
• and
• an updating step for updating α values of the switched two adjacent images so that results of compositing in the first and second overlaying orders are the same, wherein
• the first compositing step generates the composite graphical image, the calculating step calculates the composition ratio of the video image to the final composite image, and the second compositing step composites the frames with the composite graphical image using the second overlaying order and the updated α values.

A program that has a computer composite images together into a final composite image, the images including a video image and a plurality of graphical images, the program comprising:

• a first obtaining step for obtaining the graphical images and composition information that includes an image compositing order, the composition information being used for calculating a composition ratio of each of the images to the final composite image;
• the composition information further includes a composition coefficient for each of the images, each composition coefficient indicating a composition ratio of one of the images to a composite of the image with at least another one of the images;
• a first compositing step for compositing the graphical images to generate one composite graphical image according to the composition information;
• a calculating step for calculating a composition ratio of the video image to the final composite image according to the composition information;
• a second obtaining step for obtaining frames of the video image;
• a second compositing step for compositing one of the obtained frames at a time with the composite graphical image using the composition ratio of the video image;
• wherein the image compositing order indicates a first overlaying order of the images, the composition coefficients are α values, each of which indicates a composition ratio of one of the images to a composite of the image with images below the image in the first overlaying order, and the calculating step calculates the composition ratio of the video image to the final composite image from α values of the video image and images above the video image in the first overlaying order;
• a switching step for rearranging two adjacent images in the first overlaying order into a second overlaying order;
• and
• an updating step for updating α values of the switched two adjacent images so that results of compositing in the first and second overlaying orders are the same, wherein
• the first compositing step generates the composite graphical image, the calculating step calculates the composition ratio of the video image to the final composite image, and the second compositing step composites the frames with the composite graphical image using the second overlaying order and the updated α values.