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A Spectral Reconstruction Method Based on Frequency Domain Coding

A spectral reconstruction and frequency-domain coding technology, which is applied in spectrum investigation, image coding, spectrometry/spectrophotometry/monochromator, etc., can solve the problem of low spatial resolution and low signal-to-noise ratio, and sacrifice time resolution. High-frequency filter wavelength, limit the application of online reconstruction scenes, etc., to avoid calculation load, improve spatial resolution, and capture high-precision hyperspectral data.

Active Publication Date: 2022-05-17
NANJING UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The Coded Aperture Snapshot Spectral Imager (CASSI) is the first imager to recover the hyperspectral spectrum using compressive sensing theory, but this method requires careful calibration and heavy computational load, limiting its application to online reconstruction scenarios
The prism-mask modulation (PMIS) spectral video camera can directly capture multispectral video information with simple devices and calibration, but its spatial resolution is limited by the RGB camera, resulting in low light flux and signal-to-noise ratio
The multispectral camera based on filter array spectroscopic can achieve multispectral imaging by rotating the filter wheel. Although the signal-to-noise ratio can be improved, the time resolution is sacrificed and limited by the wavelength of the filter.

Method used

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  • A Spectral Reconstruction Method Based on Frequency Domain Coding
  • A Spectral Reconstruction Method Based on Frequency Domain Coding
  • A Spectral Reconstruction Method Based on Frequency Domain Coding

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Experimental program
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Embodiment 1

[0032] Such as figure 1 As shown, the spectral imaging system based on frequency domain coding in this embodiment directly covers the mask MASK on the CCD photosensitive element. Among them, the mask MASK uses an inkjet printer or a laser printer to print modulation patterns on the film that are the same size as the CCD sensor pixel and have different concentrations and colors to modulate the scene spectrum in the frequency domain.

[0033] Among them, the mask printed by the printer using micro piezoelectric technology is composed of ink droplets of different concentrations, colors, and shapes. The CMYK color mode is adopted, in which the color uses the principle of three primary colors of color materials, and a total of three colors are mixed and superimposed. The three standard colors are cyan (C), magenta (M), and yellow (Y). When printing the mask, choose to print C, M, and Y concentrations of 10% to encode and modulate the scene space and spectrum in different dimension...

Embodiment 2

[0059] When the size of the printed ink drop unit does not match the pixel size, a combination of lens, mask, relay mirror, and sensor hardware can be used to achieve the effect of modulating the spectrum, such as figure 2 shown. The specific method is:

[0060] (1) The scene is first imaged through the objective lens;

[0061] (2) A special mask encodes the spatial and spectral dimensions of the scene;

[0062] (3) The encoded image is finally collected by the camera sensor after passing through the relay mirror;

[0063] (4) After the computer acquires the coded image, it decodes and reconstructs it, and the specific process is the same as step (9) in Embodiment 1.

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Abstract

The invention discloses a spectral reconstruction method based on frequency domain coding. The steps of the method include: first, the spectral imaging system uses a mask to collect spectral information of the scene, and the mask modulates the spectral and spatial dimensions of the scene image; then, the spectral change is modulated by projecting the curve of the spectral information onto a broadband substrate, Obtain the modulated image, and then map the modulated image to the Fourier domain for multiplexing; finally use the sensor to collect the coded image compressed in spectrum and space, and reconstruct the spectral information by decoding the spectral dimension. The method of the present invention can not only improve the spatial resolution, but also simplify the spectral encoding and decoding process in the process of collecting and reconstructing data, avoid complex calculation load, and realize high-precision capture of hyperspectral data in a short time.

Description

technical field [0001] The invention relates to the field of computational photography, in particular to a spectral reconstruction method based on a frequency-domain coding mask made by a printer. Background technique [0002] Spectral imaging aims to capture the details of the spectrum of natural scenes. It plays an important role in scientific research and engineering applications, such as military security, environmental monitoring, biological science, medical diagnosis, scientific observation and many other fields. [0003] Since only 1D and 2D commercial imaging sensors are available, raw spectral imaging is achieved in scanning mode in spatial or spectral dimensions. Although the high pixel count and high sensitivity of array detectors improve spatial and spectral resolution, the requirement of stable scanning in scanning-based hyperspectral imaging systems limits the speed and robustness of spectral imaging. Therefore, studying spectral imaging of dynamic samples, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T9/00G06T7/90G01J3/28
CPCG06T5/00G06T7/90G06T9/00G01J3/2823G06T2207/10036G01J2003/284G01J2003/2843
Inventor 岳涛郭慧赵远远胡雪梅
Owner NANJING UNIV
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