National Applied Research Laboratories

Taiwan Space Agency

Chia-Ray Chen

Hsin-Chia Lin

Sheng-Feng Lin

Pei-Jun Lee

Zheng-Kai Chiu

Tien-Chun Kuo

Kuang-Zhe Liu

A catadioptric optical system in sequence of ray tracing comprises a first mirrors group of Ritchey-Chr&#xe9;tien type hyperbolic mirrors with positive diopter including a concave primary mirror having a central through hole and a convex secondary mirror, a second corrector lens group with negative diopter positioned at the image-side of the first mirrors group including a first meniscus lens element having positive refractive power and a convex object-side surface, a second lens element having negative refractive power and biconcave surfaces, a third meniscus lens element having negative refractive power and a concave object-side surface, and a fourth lens element having positive refractive power and biconvex surfaces. The infinite conjugate beams of incident light within field of view pass through the catadioptric optical system to become a corrected beam having a small CRA angle.

Catadioptric optical system

Disclosures of the present invention describe a moving object detection system and method, wherein a pre-processer module, a feature extraction module, an image optical flow estimation module, a feature points grouping module, and a moving object determination module are provided in a controlling and processing module of the system by a form of library, variables, or operands. Moreover, a feature difference calculation unit, a matrix establishing unit and a corner feature point acquiring unit are provided in the feature extraction module, and that is helpful for enhancing computing speed of the controlling and processing device in verifying corner feature points from image frames. Therefore, after the corner feature points are applied with a cluster labeling process, the moving object determination module can achieve motion detection of at least one object locating in a monitoring area by determining whether corner feature point groups move or not.

Moving object detection system and method

Growing community of inventors

Hsinchu, Taiwan

Chia-Ray Chen