A Single Pixel Fast Active Imaging System Based on Discrete Cosine Transform

Abstract

The present invention provides a single-pixel rapid active imaging system based on discrete cosine transform, which can be used for carrying out high-quality imaging. The technical core of the single-pixel rapid active imaging system is two-dimensional cosine orthorhombic structure light fields based on two-dimensional discrete cosine transform, which are generated by a light field generation module; the orthorhombic structure light fields are projected to a detected target by a light field projector to modulate an image of the target; then a modulated light field light-intensity signal is acquired by utilizing a single-pixel detector; and in an image reconstruction module, the image of the target object is reconstructed by utilizing the light field light-intensity signal and a two-dimensional discrete cosine inverse transform algorithm. The single-pixel rapid active imaging system based on discrete cosine transform has the advantages that the structure is simple; any scanning does not need to be carried out; interference of background light in the imaging environment can be avoided; utilized data is only the light-intensity signal of the modulated target; the imaging speed is high; and single-pixel imaging can be carried out under the condition of acquiring a small number of light-intensity signals.

Description

technical field [0001] The present invention relates to the field of single-pixel active imaging, in particular to a single-pixel fast active imaging system based on discrete cosine transform. Background technique [0002] In the imaging system, according to whether there is an illumination source, it is divided into two imaging methods: active imaging and passive imaging. The main feature of passive imaging is that the imaging system itself does not have a light source, and the imaging system collects the radiated light of the target object itself or the reflected ambient light for imaging. Active imaging refers to the use of artificial optical radiation sources to illuminate the target object, and the use of imaging systems to collect part of the radiation from the target object for imaging. [0003] The single-pixel camera was proposed by researchers at RICE University in the United States in 2006 (see Document 1, Duarte M F, Davenport M A, Takhar D, et al.Single-pixel i...

AI Technical Summary

Problems solved by technology

[0005] Although there have been nearly ten years of research on single-pixel imaging technology, its imaging effect is still not satisfactory, far below the level of the current traditional optical imaging system

The traditional single-pixel ghost imaging technology based on the classical correlation characteristics of thermal light sources uses laser beams to generate random speckle light fields through frosted glass. The single-pixel computational ghost imaging technology developed in recent years uses computers to input random matrices into digital micromirror devices ( DMD) generates random speckle light fields, but the light fields generated by these two methods cannot be analytically expressed by definite mathematical functions, and their image reconstruction algorithms are based on relevant statistical mathematical models, without the mathematical model basis of strict analytical expression.

These two methods need to measure the target object more than tens of thousands of times when reconstructing a high-quality image, the number of measurements is large, and the imaging time is long

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