A projection optical system (2) projects from a DMD (7) on a reducing side onto a screen (9) on an enlargement side, and includes: a first refractive optical system (10) that forms a first intermediate image (51) on the enlargement side using light incident from the reducing side; a second refractive optical system (20) that forms the first intermediate image (51) on the reducing side into a second intermediate image (52) on the enlargement side; and a first reflective optical system (30) including a first reflective surface (31a) with positive refractive power that is positioned on the enlargement side of the second intermediate image (52), wherein the second refractive optical system (20) includes a first focus lens group (61) that moves when focusing is carried out, and the first focus lens group (61) includes at least one lens (L13) included in the second refractive optical system (20).

The present disclosure relates to the technical field of digital projection display, and discloses a projection method and a projection apparatus. The method includes: acquiring a target object image; identifying attribute information of a target object based on the target object image; acquiring preset projection content based on the attribute information of the target object; acquiring a projection path; and projecting a projection screen based on the preset projection content and controlling the projection screen to move along the projection path. In this way, the projection is more flexible and more pertinent.

The present disclosure relates to the technical field of digital projection display, and discloses a projection method and a projection apparatus. The method includes: acquiring a target object image; identifying attribute information of a target object based on the target object image; acquiring preset projection content based on the attribute information of the target object; acquiring a projection path; and projecting a projection screen based on the preset projection content and controlling the projection screen to move along the projection path. In this way, the projection is more flexible and more pertinent.

A projection apparatus is provided, including a lens module, a movement element, a sensing element, and a lens control element. When the lens module moves to the origin position, the lens control element controls an image beam to focus on a first position on a reference plane in one of the tele mode and the wide mode, the lens control element controls the image beam to focus on a second position on the reference plane in the other mode, and the lens control element determines whether there is an offset between the first position and the second position. When the offset exists, the lens control element adjusts a movement parameter value of the movement element based on the offset value between the first position and the second position, so that the image beam is focused on the same position on the reference plane in the tele mode and wide mode.

The present invention provides an image correction system and method for multi-projection, the image correction system including a plurality of projection surfaces which are installed in a single theater and a projection device which projects images on the plurality of projection surfaces, in which the images projected by the projection device on the plurality of projection surfaces are corrected based on relative differences in properties of the plurality of projection surfaces.

The present invention provides an image correction system and method for multi-projection, the image correction system including a plurality of projection surfaces which are installed in a single theater and a projection device which projects images on the plurality of projection surfaces, in which the images projected by the projection device on the plurality of projection surfaces are corrected based on relative differences in properties of the plurality of projection surfaces.

Some embodiments include an underwater projection system having a water feature that includes a first underwater light niche. A user interface is configured to upload an image from a user to a controller. A projector is disposed in the first underwater light niche and is configured to project the image onto an underwater surface of the water feature. The controller is in communication with the user interface and the projector and the controller operates the projector.

Some embodiments include an underwater projection system having a water feature that includes a first underwater light niche. A user interface is configured to upload an image from a user to a controller. A projector is disposed in the first underwater light niche and is configured to project the image onto an underwater surface of the water feature. The controller is in communication with the user interface and the projector and the controller operates the projector.

A projection apparatus configured to project a projection image based on image data through a projection optical system that includes a field curvature adjustment lens unit configured to adjust a field curvature in order to focus on a nonplanar projection surface includes a processor configured to generate the image data including information on a focus fixed position where a focus does not change on the projection surface in adjusting the field curvature.

A projection apparatus configured to project a projection image based on image data through a projection optical system that includes a field curvature adjustment lens unit configured to adjust a field curvature in order to focus on a nonplanar projection surface includes a processor configured to generate the image data including information on a focus fixed position where a focus does not change on the projection surface in adjusting the field curvature.