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 display apparatus includes a projection lens unit that projects image light and on which external light including the image light reflected by a projection target is incident, an optical path separation prism, a narrowband retarder plate and an imaging element. The optical path separation prism includes the first prism having first and second surfaces, the second prism having a third surface disposed on a side of projection lens unit, a fourth surface facing the second surface and a fifth surface, and the polarization separation coating being disposed between the second surface and the fourth surface. The narrowband retarder plate aligns the image light into a first polarization state. Light in a second polarization state in the external light is reflected by the polarization separation coating, is totally internally reflected by the third surface, is emitted from the fifth surface, and is received by the imaging element.

A projector, a 3D sensing module and a method for fabricating the projector are provided. The 3D sensing module includes the projector and a receiver. The projector is configured to project a light beam to an object, and the receiver is configured to receive the light beam reflected from the object. The projector includes a circuit board, electronic components, a holder and a lens module. The circuit board has a plurality of first bonding pads and a plurality of second bonding pads on a top surface of the circuit board. The electronic components are bonded on the first bonding pads. The holder has a cavity and third bonding pads bonded on and electrically connected to the second bonding pads. The lens module is disposed in the cavity of the holder.

There is provided an information generation method including, identifying a correspondence relationship between a projector coordinate system and a camera coordinate system, receiving a first operation of designating a first display area representing an arrangement destination of a projection object which is projected on a projection target in a first coordinate system which is one of the camera coordinate system or the projector coordinate system, transforming the first display area into a second display area representing an arrangement destination of the projection object in a second coordinate system which is another of the camera coordinate system or the projector coordinate system based on the correspondence relationship, receiving a second operation of changing at least one of a shape or a position of the second display area, and generating information for changing at least one of a shape or a position of the projection object in accordance with the second operation.

A retinal camera system comprises an eyepiece lens disposed within a housing, a retinal image sensor, and a visual guidance indicator. The retinal image sensor is adapted to acquire a retinal image of an eye through the eyepiece lens. The visual guidance indicator is disposed in or on the housing peripherally about the eyepiece lens. The visual guidance indicator is positioned and oriented relative to the eyepiece lens to emit a visual cue along an optical path that does not pass through the eyepiece lens. The visual cue is adapted to facilitate alignment of the eye to the eyepiece lens.

The position detection method includes projecting a detecting image on a projection surface from a projection section, taking, by an imaging section, an image of the projection surface in a first direction from the projection section in a situation in which the detecting image is projected on the projection surface and a pointing body touches the projection surface to thereby generate imaging data, and detecting a position of a touch portion by the pointing body on the projection surface based on the imaging data, wherein the detecting image represents a plurality of objects located in a matrix and the position of the touch portion is detected based on a positional relationship in the predetermined direction corresponding to a first direction of the plurality of objects represented by the imaging data.

The position detection method includes projecting a detecting image on a projection surface from a projection section, taking, by an imaging section, an image of the projection surface in a first direction from the projection section in a situation in which the detecting image is projected on the projection surface and a pointing body touches the projection surface to thereby generate imaging data, and detecting a position of a touch portion by the pointing body on the projection surface based on the imaging data, wherein the detecting image represents a plurality of objects located in a matrix and the position of the touch portion is detected based on a positional relationship in the predetermined direction corresponding to a first direction of the plurality of objects represented by the imaging data.

An interactive multimedia device designed to display an image on a flat surface below the device, e.g., on the floor. The interactive multimedia device has a housing (10) which comprises a projector (11), at least one loudspeaker (12), a camera (13), an IR illuminator (15), a power supply module, and a control unit (16), wherein the housing (10) has vents (6) of housing (10), wherein the vents (6) of housing (10) have the same size and shape as those of the vents (17) of projector (11), wherein the vents (6) of housing (10) are oriented in the same way as the vents (17) of projector (11) and the vents (6) of housing (10) are located above the vents (17) of the projector (11).

An interactive multimedia device designed to display an image on a flat surface below the device, e.g., on the floor. The interactive multimedia device has a housing (10) which comprises a projector (11), at least one loudspeaker (12), a camera (13), an IR illuminator (15), a power supply module, and a control unit (16), wherein the housing (10) has vents (6) of housing (10), wherein the vents (6) of housing (10) have the same size and shape as those of the vents (17) of projector (11), wherein the vents (6) of housing (10) are oriented in the same way as the vents (17) of projector (11) and the vents (6) of housing (10) are located above the vents (17) of the projector (11).

Systems, devices, and techniques related to matching features between a dynamic vision sensor and one or both of a dynamic projector or another dynamic vision sensor are discussed. Such techniques include casting a light pattern with projected features having differing temporal characteristics onto a scene and determining the correspondence(s) based on matching changes in detected luminance and temporal characteristics of the projected features.