Patent ID: 11928775
Assignee: RICOH COMPANY, LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 6:
7. A method comprising:
selecting, from at least two images captured in different image-capturing directions and with image-capturing ranges overlapping with each other, an image to be at foreground as viewed from a virtual camera based on an orientation or an angle of view of the virtual camera and the image-capturing directions of the at least two images;
mapping the at least two images onto a three-dimensional object to generate a virtual image, in which the at least two images overlap with each other, having a wider angle of view than the at least two images;
performing perspective projection on the virtual image using the virtual camera, to generate a plane image, based on the selected image to be at the foreground, as a display image;
calculating an inner product of an image-capturing vector of each of the image-capturing directions of the at least two images and an orientation vector of the virtual camera;
overlapping the at least two images based on the inner product calculated for each of the at least two images;
determining whether a display range for the display image is within a display-limit range, based on the inner product calculated for each of the at least two images;
determining, in response to a change in the display range, whether the display range is within the display-limit range, based on a displaying angle of view of the display range and an image-capturing angle of the image to be at the foreground;
correcting the display range by shifting the display range based on a displaying angle of view to be within the display-limit range based on a determination that the display range is not within the display-limit range;
comparing a greatest inner product among the inner products calculated, with a cosine value calculated based on an image-capturing angle of view and a diagonal angle of view of the display range; and
performing no image processing when the greatest inner product is less than the cosine value,
wherein each of the at least two images is a wide-angle of view, a fish-eye image, or a spherical image based on the wide-angle of view or the fish-eye image.