Active-passive imaging system for cat eye target detection

Abstract

The invention discloses an active-passive imaging system for cat eye target detection. The system comprises a pulse laser, an emission optical system, an optical lens, a CCD detector, a video processing system and a control and delay circuit. The CCD detector conducts image acquisition on a target area through the optical lens, and transmits collected images to the video processing system. When the video processing system detects that transmission of two continuous frames of images is finished, a trigger signal is generated and transmitted to the control and delay circuit, the control and delay circuit immediately generates an electric pulse signal with the effective width equal to the acquisition cycle of the CCD detector after receiving the trigger signal, and then the trigger signal is transmitted to the pulse laser. The pulse laser generates a laser pulse signal according to the electric pulse signal, and emits a laser beam to a target to be detected through the emission optical system. According to the active-passive imaging system for cat eye target detection, generated laser pulses can track the changes of the detector acquisition frame frequency in a self-adaptive mode, so that active imaging quality is improved, and then the passive image matching ratio is improved.

Description

technical field [0001] The invention relates to laser active and passive imaging technology, which belongs to the field of laser imaging technology, in particular to an active and passive imaging system for cat's eye target detection, which is used for active and passive imaging of cat's eye targets. Background technique [0002] In most optoelectronic equipment, the radiation and scattering signals of the target are converged to a high-sensitivity photoelectric sensor through an optical system with a certain caliber. When the laser beam irradiates the optical target window and enters the field of view of the optical system, according to The reversibility of the optical path, the optical system will reflect a part of the original optical path of the laser signal back, and this reflected light will be very bright after being collimated by the optical system. Moreover, no matter what angle the incident light enters the optical system, as long as it can reach the sensor, the re...

AI Technical Summary

Problems solved by technology

[0005] However, the existing detection system uses a pulsed laser with a fixed repetition rate as the light source to generate active and passive images with fixed frequency changes, which are collected by the detector. However, when the pulse width is too wide or too narrow, two consecutive images will be generated. Both are problems of active or passive images, and the detector itself may have stability problems, making it impossible to collect images according to its own frame rate. When the frame rate fluctuates, it will produce half active images or half passive images. In this situation, the imaging quality is poor and the matching rate is low, which leads to the problem of unclear target identification and high false alarm rate of the detection system.

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