Abstract: One embodiment according to the present disclosed technology provides an image processing apparatus, an image processing system, an image processing method, and an image processing program for outputting a warning from an output device based on an indicator for concatenation of moving images. According to an aspect of the present invention, there is provided an image processing apparatus including a processor, in which the processor performs: image acquisition processing of acquiring a plurality of moving images having overlapping imaging ranges; information acquisition processing of acquiring information on a stitching region to be used for concatenation of the plurality of moving images; indicator calculation processing of calculating an indicator based on a distance between a subject and a stitching line set in the stitching region; and warning processing of outputting a warning from an output device based on the indicator.

Abstract: The projection optical system that projects an image, which is displayed on an image display surface on a reduction side, to a magnification side, in which at least one intermediate image is formed inside the projection optical system, and the projection optical system includes a first stop, of which an aperture diameter is variable, at a position closer to the reduction side than the intermediate image closest to the reduction side.

Abstract: The optical device projects an image, which is displayed on an image display surface on a reduction side, to a magnification side. The optical device includes: a first optical system; and a second optical system, in order from the magnification side to the reduction side along an optical path. The first optical system is an image forming optical system which is not telecentric on the reduction side, the second optical system is telecentric on the reduction side, the first optical system is housed in a first lens barrel, and the second optical system is housed in a second lens barrel, and an optical system on the optical path from a surface closest to the magnification side in the first optical system to a surface closest to the reduction side in the second optical system is shift-able with respect to the image display surface.

Abstract: The image forming optical system is capable of forming an image on a conjugated plane on a reduction side as an intermediate image and re-forming the intermediate image as a magnified image on a conjugated plane on a magnification side. The image forming optical system includes: a first adjustment group that moves along an optical axis in adjusting an image formation position of a region of the magnified image including a farthest point from the optical axis; and a second adjustment group that moves along the optical axis in adjusting an image formation position of a region of the magnified image including a nearest point from the optical axis. An optical element disposed closest to the magnification side is a lens. The second adjustment group has a positive refractive power as a whole, and is disposed closest to the reduction side.