Long-distance atmospheric turbulence resistance imaging method and system

Abstract

The invention discloses a long-distance atmospheric turbulence resistance imaging method and a long-distance atmospheric turbulence resistance imaging system. The imaging method is characterized by adopting a detector for carrying out N times of consecutive imaging on a target object in a sunlight field, wherein the interval time between two adjacent imaging is greater than the exposure time of the detector, and calculating intensity variance of each point by adopting the correlation between each point in the space and the target object and by using results of N times of consecutive imaging, so as to obtain image quality with high contrast and high signal-to-noise ratio. Compared with the traditional direct imaging, the imaging scheme proposed by the invention eliminates the influence of atmospheric turbulence, improves the practicability of the correlated imaging technique, can be directly used for long-distance atmospheric turbulence resistance imaging and increases the image recognition rate.

Description

technical field [0001] The invention relates to an imaging method and system, belonging to the field of associated imaging algorithms. Background technique [0002] Traditional imaging uses an optical system to focus the image of the target on the imaging element. The image quality of the image will be affected by the intensity of atmospheric turbulence, resulting in blurred images, unclear details, low contrast, and inability to identify targets. Correlation imaging is the convolution of the target object with the optical point spread function. Compared with traditional imaging, correlation imaging can reduce the influence of atmospheric turbulence to a certain extent, but its practical application is still limited. The main factors include: (1) false The brightness of the thermal light source is limited, and long-distance imaging cannot be realized; (2) the modulation speed of the high-brightness pseudothermal light source is limited, and fast imaging cannot be achieved; (...

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Problems solved by technology

[0002] Traditional imaging uses an optical system to focus the image of the target on the imaging element. The image quality of the image will be affected by the intensity of atmospheric turbulence, resulting in blurred images, unclear details, low contrast, and inability to identify targets.

Correlation imaging is the convolution of the target object with the optical point spread function. Compared with traditional imaging, correlation imaging can reduce the influence of atmospheric turbulence to a certain extent, but its practical application is still limited. The main factors include: (1) false The brightness of the thermal light source is limited, and long-distance imaging cannot be realized; (2) the modulation speed of the high-brightness pseudothermal light source is limited, and fast imaging cannot be achieved; (3) the existing detectors cannot complete the alignment of the light field within a picosecond coherence time The continuous direct recording of solar light correlative imaging cannot be practical by using the existing technology

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