According to an image processor of one embodiment, a first acquirer acquires a first perspective image of a target viewed in a first direction. A second acquirer acquires a second perspective image of the target viewed in a second direction at a time different from when the first acquirer acquires the first perspective image. The second direction is substantially the same as the first direction. The second time is different from the first time. A point acquirer acquires first information indicating a first position of a first point on the first perspective image, and a second information indicating a second position of a second point on the second perspective image. An image generator generates an image that is based on the first and second perspective images, wherein a first coordinate of the first perspective image is changed so that the first point corresponds to the second point.