Difference-based projector street corner imaging method

Abstract

The present invention discloses a difference-based projector street corner imaging method. According to the method, random speckles generated by a projector irradiate an object; the random speckles are diffusely reflected through the wall surface of a street corner, and a bucket detector with no spatial resolution power located at one side of the street corner collects and detects the diffusely reflected light of the wall surface; after the light intensity value of the bucket detector is calculated, the difference information of the object is taken as an imaged object, and a difference value is used to replace the light intensity value, the average intensity fluctuation of a light field is removed; by means of second-order correlation, the image of the object that cannot be directly imagedon the street corner can be obtained; the influence of noises on an imaging result are considered, when the resolution of the object is small, the SNR (signal to noise ratio) of GI (Ghost Imaging) islow due to the interference of background light, and therefore, a differential algorithm is introduced to reduce the influence of the noises, and as a result, imaging quality can be effectively improved. The method of the invention has the advantages of structural simplicity and convenience in realization, can satisfy the needs of street corner monitoring and imaging, and has a bright applicationprospect.

Description

technical field [0001] The invention relates to a differential-based projector "street corner imaging" method, which belongs to the technical field of associated imaging. Background technique [0002] Correlated Imaging, also known as "Ghost Imaging, GI", is one of the frontiers and hotspots in the field of quantum optics in recent years. Different from traditional imaging, in the reference light path that does not directly illuminate the object, the correlative imaging system can obtain high-quality imaging, so it is called "ghost" imaging. With the deepening of research, researchers have proposed thermal optical ghost imaging and computational ghost imaging. The imaging quality of ghost imaging is getting higher and higher, and the requirements for equipment are getting lower and lower, so that the application of ghost imaging in various fields can be realized. [0003] In 1995, Pittman et al. realized entanglement correlation imaging experimentally according to Klyshko's...

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Problems solved by technology

[0004] However, the above-mentioned imaging method requires the object and the detector to be in the same optical path, and does not take into account the fact that the object cannot be directly imaged, and when the resolution of the object itself is small, due to the interference of background light, the large image noise power makes the GI signal The noise ratio (Signal-to-Noise Ratio, SNR) is small, and the restored image quality is poor

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