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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: 2019-01-29
NANJING UNIV
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  • 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

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Experimental program
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Effect test

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 a modulation pattern with the same pixel size as the CCD sensor and with different concentrations and different colors on the film to perform frequency domain modulation on the scene spectrum.

[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 color mixing of the three primary colors, 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 with a density of 10% each to encode and modulate the scene space and spectrum in dif...

Embodiment 2

[0059] When the printed ink drop unit size does not match the pixel size, a combination of lens, mask, relay lens, 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) Special masks encode 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 lens;

[0063] (4) The computer decodes and reconstructs the coded image after obtaining it. The specific process is the same as step (9) in the first embodiment.

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Abstract

The invention discloses a spectral reconstruction method based on frequency domain coding. The method comprises the following steps: firstly, a spectral imaging system collects spectral information ofa scene by using a mask, and the mask modulates the spectral dimension and the spatial dimension of the scene image; then the modulated image is obtained by projecting the spectral information onto abroadband substrate to modulate the spectral change, and the modulated image is mapped to a Fourier domain for multiplexing. Finally, the encoded images compressed in spectrum and space are collectedby the sensor, and the spectral information is reconstructed by decoding the spectral dimension. The method of the invention not only can improve the spatial resolution, but also simplifies the spectral encoding and decoding process in the process of collecting and reconstructing data, avoids the complex calculation load, and realizes the high-precision capture of the high-spectral data in a short time.

Description

Technical field [0001] The present invention relates to the field of computational imaging, in particular to a method of spectrum reconstruction 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 one-dimensional and two-dimensional commercial imaging sensors are available, raw spectral imaging is realized in a scanning mode in spatial or spectral dimensions. Although the high pixel count and high sensitivity of the array detector improve the spatial and spectral resolution, the scanning-based hyperspectral imaging system requires stable scanning, which limits the speed and robustness of spectral imaging. Therefore, the study of sp...

Claims

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Application Information

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Patent Type & Authority Applications(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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