Abstract: An error correction method and device for a line structured light 3D camera. The method comprises: placing a 3D calibration plate at different positions in the field of view of the 3D camera, and allowing a relative motion to scan the 3D calibration plate to obtain multiple sets of point cloud data at different positions; processing the point cloud data and calculating corner coordinates of the 3D calibration plate corresponding to each set of point cloud data; constructing an error correction model by using an inclination angle, caused by an error, between a straight line along which the relative motion direction lies and a laser plane of the 3D camera as an error model correction parameter; calculating error correction model parameters according to a space vector constraint relationship between corner points; and applying the model to the point cloud data of a measured object to obtain distortion-free point cloud data.

Abstract: An imaging lens and a projection device including the imaging lens are provided. The imaging lens includes a central lens portion and a peripheral lens portion arranged around the central lens portion. The peripheral lens portion has opposite first outer and inner surfaces, at least one of the first outer and inner surfaces has a plurality of first convex regions. The central lens portion has opposite second outer and inner surfaces, and at least one of the second outer and inner surfaces of the central lens portion protrudes beyond the corresponding first outer or inner surface of the peripheral lens portion.

Abstract: Disclosed is a light emitting device, which includes a housing having a light transmittable portion, which has a first region and a second region; a light shield layer, covered on a wall surface of the first region; and a light emitting assembly, arranged in the housing, the light emitting assembly is configured to emit a first beam able to travel through the housing and project a pattern to an ambient environment. The light emitting assembly is further configured to emit a second beam able to transmit through the light transmittable portion; and the second beam transmitted through the first region and the light shield layer has a first brightness, the second beam transmitted through the second region has a second brightness greater than the first brightness.

Abstract: Disclosed are a light emitting assembly and a light emitting device. The light emitting device includes a first light emitting element, a first light transmission portion and a driving portion, The first light emitting element emits a first light beam. The driving portion can drive the first light emitting element or the first light transmission portion, such that a position relationship between the first light emitting element and the first light transmission portion is switchable between a first state and a second state. In the first state, the first light beam passing through the first light transmission portion presents a first pattern; in the second state, the first light beam passing through the first light transmission portion presents a second pattern which is different from the first pattern.

Abstract: The invention discloses a projection night light, comprising a shell, and a projection component and a lighting component arranged in the shell, wherein the projection component comprises a first lamp bead and an aurora cover covered on the first lamp bead; the lighting component comprises second lamp beads and a diffuser covered on the second lamp beads; the diffuser is in a ring shape and is arranged around the aurora cover; the center of the shell is provided with an opening; the aurora cover and the diffuser extend out of the shell from the opening. The lighting component of the projection night light of the invention is arranged around the projection component so that the light paths of the two will not affect each other, which allows the invention to have a variety of different ways of use: create atmosphere for users, decorate the room, assist sleep, etc.