An imaging method and system for long-distance anti-atmospheric turbulence

Abstract

The invention discloses an imaging method and system for long-distance anti-atmospheric turbulence. Under the solar light field, a detector is used to perform N times of continuous imaging on a target object. The interval between two adjacent imaging is greater than the exposure time of the detector. The correlation between each point and itself, using the results of N consecutive imaging to calculate the intensity variance of each point, can obtain image quality with high contrast and signal-to-noise ratio. Compared with traditional direct imaging, the imaging scheme proposed by the present invention eliminates the influence of atmospheric turbulence, improves the practicability of associated imaging technology, can be directly used for long-distance anti-atmospheric turbulence 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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