Imaging objective lens suitable for RGB-D camera

Abstract

The invention discloses an imaging objective lens suitable for an RGB-D camera. A first lens, a first spacer ring, a second lens and a third lens which are attached in a lens cone in sequence from the objective space to the image space form the imaging lens. The imaging objective lens is of a three-piece spherical mirror structure, one mirror surface of each lens is a plane, the other mirror surface of each lens is a spherical surface, and thus machining cost is low; meanwhile, the second lens and the third lens are tightly attached, no spacer ring is needed, and thus the imaging objective lens is compact in structure and small in size; besides, the three lenses are the same in radius, and thus the assembling process is simple. In a broad spectrum region from visible light to near infrared rays, imaging definition is high, optical performance is excellent, and a large view field of 65 degrees and distortion smaller than 3.2% can be achieved. The imaging objective lens is suitable for a deep imaging system with infrared-assisted lighting and achieves user-friendly and easy-to-use natural man-machine interaction.

Description

technical field [0001] The invention relates to an imaging objective lens suitable for RGB-D cameras, which is suitable for the fields of depth imaging and human-computer interaction. Background technique [0002] With the continuous popularization and development of computer technology, friendly and easy-to-use natural human-computer interaction will become a major trend in the development of human-computer interaction. Depth imaging technology, as an important input technology in natural human-computer interaction technology, makes non-contact gesture and gesture interaction possible. The RGB-D camera is the key device for depth imaging. The system uses it to obtain the three-dimensional depth information of the scene. Therefore, its imaging quality directly affects the accuracy and resolution of depth imaging, which in turn affects the human-computer interaction experience. [0003] Existing imaging lenses only optimize image quality for the visible light region, and per...

AI Technical Summary

Problems solved by technology

RGB-D camera is the key equipment for depth imaging, the system uses it to obtain the three-dimensional depth information of the scene, so its imaging quality directly affects the accuracy and resolution of depth imaging, and then affects the human-computer interaction experience

[0003] Existing imaging lenses only optimize image quality for the visible light region, and perform poorly in the near-infrared region. It is necessary to add an infrared cut filter in front of the image sensor to eliminate the influence of infrared light

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