A method of leveling an elevator car, a projection device and a leveling system. The method of leveling an elevator car includes: stopping the elevator car on a set landing; generating a calibration image that spans across the base plane of the elevator car and the base plane of the landing; processing the calibration image, and determining whether the elevator car is leveled with the landing based on the calibration image processing result; and ascending or descending the elevator car when it is determined that the elevator car is not leveled with the landing. According to the leveling method of the present application, it is possible to quickly and easily identify whether the object to be leveled is leveled with the leveling reference by analyzing and processing the calibration image, and even further identify the degree of levering, thereby realizing quick and simple leveling.

A method of leveling an elevator car, a projection device and a leveling system. The method of leveling an elevator car includes: stopping the elevator car on a set landing; generating a calibration image that spans across the base plane of the elevator car and the base plane of the landing; processing the calibration image, and determining whether the elevator car is leveled with the landing based on the calibration image processing result; and ascending or descending the elevator car when it is determined that the elevator car is not leveled with the landing. According to the leveling method of the present application, it is possible to quickly and easily identify whether the object to be leveled is leveled with the leveling reference by analyzing and processing the calibration image, and even further identify the degree of levering, thereby realizing quick and simple leveling.

A mat has an embedded array of light sensors under a micro-faceted lens array to provide an array of light intensity values for various incident angles of incident real world light. Virtual objects may be projected onto the mat and, using the information from the light sensors, virtually illuminated to match the real-world lighting environment. A touch sensor array may be embedded in the mat to allow users to interact with the virtual objects and provide other input. The surface of the micro-faceted lens array may be coated with a patterned infrared (IR) reflective coating, such that the mat passively reflects a specific band of IR wavelengths in a pattern to act as a fiducial marker.

A reference position setting method according to the present disclosure is a reference position setting method for setting a reference position for recognizing whether or not an operation unit displayed as a virtual image has been operated. The reference position setting method includes: a step of displaying a marker displayed as a virtual image larger than an object approaching the marker; a step of detecting the object approaching the marker; and a step of making a color or shade of the outer edge of the marker different from a color or shade of the center of the marker after the step of detecting the object.

The invention concerns a calibration target (30) of an optical system, formed of a plate (32) comprising through holes (38).

The invention concerns a calibration target (30) of an optical system, formed of a plate (32) comprising through holes (38).

A dual focal plane optical sighting device, such as a riflescope, having two focal planes, with a first reticle at the first focal plane, and a second reticle at the second focal plane. The reticle at the first focal plane is a glass etched reticle; the reticle at the second focal plane is a wire reticle. The two reticles have different patterns or markings providing the appearance of a single reticle or complementary markings when viewed through the optical sighting device.

A dual focal plane optical sighting device, such as a riflescope, having two focal planes, with a first reticle at the first focal plane, and a second reticle at the second focal plane. The reticle at the first focal plane is a glass etched reticle; the reticle at the second focal plane is a wire reticle. The two reticles have different patterns or markings providing the appearance of a single reticle or complementary markings when viewed through the optical sighting device.

Disclosed is an optical scope including an objective lens, an eyepiece lens, and a reticle, wherein a field lens having negative power is disposed in at least one of a front and a back of the reticle disposed on an image formation surface of the objective lens to increase eye-relief.

Disclosed is an optical scope including an objective lens, an eyepiece lens, and a reticle, wherein a field lens having negative power is disposed in at least one of a front and a back of the reticle disposed on an image formation surface of the objective lens to increase eye-relief.