Large-field-of-view correlated imaging device and imaging method

Abstract

The invention discloses a large-field-of-view correlated imaging device and an imaging method. The imaging device comprises a pulse light source, a light modulation unit, a directional scanning projection unit, a light receiving unit, a central processing unit, a display unit, which are sequentially arranged along a light path, and a control unit connected with the directional scanning projection unit, the light modulation unit and the central processing unit. The divergence angle of an emergent light beam is adjusted through the directional scanning projection unit, so that light energy intensively irradiates a local area of a field of view to obtain an extremely high signal-to-noise ratio, and the imaging distance is increased. According to the invention, any large-range view field imaging can be achieved by setting the types and parameters of the light beam directional scanning mechanisms and combining the image splicing technology, the application range of the device is widened, view field expansion can be achieved only through one or a few scanning mechanisms, and the device is low in machining and assembling difficulty and high in stability. The image resolution of the imaging device is determined by the light modulation unit, and the directional scanning mechanism does not influence the image resolution.

Description

technical field [0001] The invention relates to the field of target detection, identification and imaging, in particular to a large field of view associated imaging device and an imaging method. Background technique [0002] Time-of-flight (TOF)-based laser imaging radar has the capability of over-the-horizon three-dimensional detection, and is an indispensable detection method for future applications such as intelligent driving, remote sensing mapping, intelligent monitoring, and scene reproduction. [0003] At present, the commonly used laser imaging radar adopts the "point-to-point" direct information acquisition mode. Multi-line imaging is achieved through multiple sets of "transmit-receive" units combined with mechanical scanning or beam deflection devices. On the one hand, this imaging method has a limited imaging distance, and the resolution of long-distance imaging is extremely low; on the other hand, the system requires high precision optical machining and alignmen...

AI Technical Summary

Problems solved by technology

However, the existing correlative imaging technology still has the following problems: 1. The high-energy laser light output by the light source is modulated by the spatial light modulation device, and the light energy loss is high, which is not conducive to the expansion of the imaging distance; 2. The beam passes through the projection unit with a certain The divergence angle propagates to the front of the device, and the light energy density has an inverse square relationship with the increase of the propagation distance, which is not conducive to the detection of long-distance targets; 3. Although the small field of view of the device can realize high-definition imaging of long-distance local areas, when the device is placed Vehicles, robots, airplanes and other vehicles with frequently changing motion states, the drastic changes in the imaging range will lead to many problems such as inability to aim at the target, motion blur, etc., which reduces the practicability of the system; 4. Expand the field of view by modifying the optical parameters of the projection unit field, the light energy density will drop significantly with the increase of the field of view size, shortening the detection distance of the device

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