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High speed single-pixel imaging method

An imaging method and single-pixel technology, applied in image communication, image data processing, graphics and image conversion, etc., can solve the problems of slow imaging speed, long measurement time of single-pixel imaging, and inability to realize real-time imaging

Active Publication Date: 2017-10-31
JINAN UNIVERSITY
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AI Technical Summary

Problems solved by technology

Therefore, as a digital micromirror device as a spatial wavefield modulator, it is impossible to generate a series of cosine-distributed Fourier fundamental wavefields with different frequencies and different phases at high speed, resulting in a single-pixel imaging measurement time is too long. Long, the imaging speed is too slow to achieve real-time imaging

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Embodiment 1

[0032] The physical picture of the target object is as Figure 5 shown. First, according to the formula Generate a series of spatial frequencies (f x , f y ) are different, the initial phase Different Fourier basis patterns. The image size of each pattern is 256×256 pixels. Among them, f x and f y The value of is 0, The values ​​of a and b are 0°, 120° and 240°; both a and b are 1, and the Fourier base pattern is represented by an 8-bit grayscale image, that is, the grayscale value of each pixel on the image is quantized from 0 to 255 an integer between. Since the Fourier spectrum of an image has conjugate symmetry, only half of the Fourier coefficients in the Fourier spectrum have to be sampled. In this example we only obtain the Fourier spectrum part of the coefficient. Therefore, a total of 256×256×3÷2=98304 Fourier-based patterns are generated.

[0033]Then, use the general cubic interpolation algorithm (Cubic Interpolation) to interpolate all Fourier-base...

Embodiment 2

[0038] First, according to the formula Generate a series of spatial frequencies (f x , f y ) are different, the initial phase Different Fourier basis patterns. The image size of each pattern is 128×128 pixels. where f x and f y The value of is 0, The value of is 0, and Both a and b take 1, and the Fourier-based pattern is represented by an 8-bit grayscale image, that is, the grayscale value of each pixel on the image is quantized to an integer between 0 and 255. In this embodiment, the sparsity of the Fourier spectrum of the natural image is utilized, that is, the energy of the image is mainly concentrated in the low spatial frequency region of the Fourier spectrum, and we only sample 333 Fourier coefficients in the Fourier spectrum. Since obtaining a Fourier coefficient requires three patterns with the same spatial frequency but different initial phases, we generate 999 Fourier-based patterns with the lowest spatial frequency.

[0039] Then, use the general cub...

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Abstract

The invention discloses a high speed single-pixel imaging method which comprises the following steps: generating a series of binarized Fourier-based patterns for approximately representing multi-gray level Fourier-based patterns, then modulating a wave field emitted by a wave source by means of a high speed spatial wave field modulator according to the binarized Fourier-based patterns to generate a series of different wave fields modulated in a space; irradiating the wave fields successively to a target object through a projection system according to different frequencies and different initial phases, forming interaction between irradiating waves and the target object to generate interaction signals, and synchronously and successively measuring the interaction signals by means of a single-pixel detector; calculating Fourier transform spectrum coefficients of the frequency for measured values of a plurality of wave fields of different initial phases of a same frequency by means of a detector so as to obtain a series of Fourier transform spectrum coefficients; and finally performing Fourier transform on the Fourier transform spectrum formed by the Fourier transform spectrum coefficients of all frequencies or part of frequencies to obtain a target object image.

Description

technical field [0001] The invention relates to the field of imaging, in particular to a method for high-speed single-pixel imaging. Background technique [0002] Single-pixel imaging technology uses a detector without spatial resolution (such as a photodiode) to perform multiple sampling in time to complete the acquisition of image information. The currently widely used two-dimensional array silicon photodetectors (such as CCD and CMOS) are only suitable for detection in the visible light band. However, certain fields such as biomedicine and industry must use non-visible light waves (such as infrared, terahertz wave bands) or sound waves for imaging, and these two-dimensional array detectors of non-visible light waves or sound waves are difficult to manufacture, thus This has led to the need for single-pixel imaging technology, which is why single-pixel imaging technology has become a hot research in the past decade. [0003] For two-dimensional imaging, published single-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232G06T3/40
CPCG06T3/4007H04N23/80
Inventor 钟金钢张子邦
Owner JINAN UNIVERSITY
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