Abstract: A method of measuring an offset of an optical axis of an imaging system is implemented by a computing device. The imaging system captures a reference central marker and two reference outer markers on a surface to obtain a captured central marker and two captured outer markers on an image. The imaging system is rotated by a target angle such that the captured central marker is located at a center point of the image. The method includes: obtaining an input of an FOV of the imaging system, and a pair of distances from the reference central marker to each of the reference outer markers, or to each of the captured outer markers; based on the FOV and the pair of distances, obtaining a value of the target angle; and obtaining the offset based on the value of the target angle and an EFL of the imaging system.

Abstract: A method of measuring an offset of an optical axis of an imaging system is implemented by a computing device. The imaging system captures a reference central marker and two reference outer markers on a surface to obtain a captured central marker and two captured outer markers on an image. The imaging system is rotated by a target angle such that the captured central marker is located at a center point of the image. The method includes: obtaining an input of an FOV of the imaging system, and a pair of distances from the reference central marker to each of the reference outer markers, or to each of the captured outer markers; based on the FOV and the pair of distances, obtaining a value of the target angle; and obtaining the offset based on the value of the target angle and an EFL of the imaging system.

Abstract: A field curvature virtual image display system applicable to a projection lens set comprises: an image source disposed in a partial region of an objective plane of the projection lens set; a first imaging group having a front lens group and a back lens group; and a second imaging group having a partial reflection and partial transmission surface and an antireflection surface and functioning as an image combiner. In a field curvature virtual image display system system, the objective plane is imaged as a virtual image surface with a specific field curvature type to generate an including angle between the optical axis of the first imaging group and the optical axis of active virtual image.

Abstract: A field curvature virtual image display system applicable to a projection lens set comprises: an image source disposed in a partial region of an objective plane of the projection lens set; a first imaging group having a front lens group and a back lens group; and a second imaging group having a partial reflection and partial transmission surface and an antireflection surface and functioning as an image combiner. In a field curvature virtual image display system system, the objective plane is imaged as a virtual image surface with a specific field curvature type to generate an including angle between the optical axis of the first imaging group and the optical axis of active virtual image.