Unlock instant, AI-driven research and patent intelligence for your innovation.

Spectral Video Acquisition Method Based on DMD Variable Coding Template

An encoding template and video acquisition technology, applied in the field of spectral imaging, can solve the problems of limiting the spectral video acquisition rate, increasing the exposure time of the system, affecting the imaging quality, etc., to reduce costs, reduce algorithm complexity, improve quality and speed Effect

Active Publication Date: 2022-06-07
XIDIAN UNIV
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This encoding template design has a small luminous flux, which not only affects the imaging quality, but also increases the exposure time of the system, limiting the acquisition rate of spectral video

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Spectral Video Acquisition Method Based on DMD Variable Coding Template
  • Spectral Video Acquisition Method Based on DMD Variable Coding Template
  • Spectral Video Acquisition Method Based on DMD Variable Coding Template

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The existing snapshot-type spectral video acquisition scheme uses a fixed transmission encoding template to encode the scene. The luminous flux is small, which not only affects the imaging quality, but also increases the exposure time of the system, limiting the acquisition rate of spectral video. Aiming at this situation, the present invention conducts research and experiments, and designs a spectral video acquisition method based on a DMD variable coding template. The present invention operates on a DMD and complementary all-pass based computational spectral imaging system.

[0028] The patent "Computational Spectral Imaging System and Method Based on DMD and Complementary All-pass" applied by Xidian University (patent application number: 202110086793.3) uses DMD (Digital Micromirror Devices) as an encoding template. DMD is a kind of A device composed of multiple independently controllable digital micromirror units. By controlling the deflection of the DMD micromirr...

Embodiment 2

[0040] The spectral video acquisition method based on the DMD variable coding template is the same as the embodiment 1, and the method for designing a single coding template according to the dispersion width and the dispersion direction described in step (2) is as follows:

[0041] (2.1) Calculate the number of micromirrors L spaced by the sampling points of the coding template along the dispersion direction: set the magnification from the image plane of the DMD coding template to the camera sensor plane in the imaging system to be θ, the size of a single DMD micromirror is α, and the camera sensor The cell size is β, and the α and β length units are the same. If the dispersion width of the sampling point in the spectral image is N pixels, the number L of micromirrors spaced by the sampling point of the encoding template along the dispersion direction at least satisfies:

[0042]

[0043] In the formula, the actual dispersion width of the sampling point on the camera sensor...

Embodiment 3

[0048] The spectral video acquisition method based on the DMD variable coding template is the same as the embodiment 1-2, the transform coding template described in step (4) collects the spectral video data frame, and the DMD transforms the coding template every time to control the camera of two channels of RGB and spectrum Simultaneous acquisition of images is as follows:

[0049] (4.1) Use the DMD control board to provide the hard trigger signal for the two cameras: connect the hard trigger lines of the two cameras to the signal output line of the DMD control board, and use the rising edge of the trigger signal output from the DMD control board to synchronously trigger and control the two cameras. The camera synchronizes the exposure to capture the image. During the acquisition process, the coding template needs to be quickly changed. In order to ensure that the coding template will not change during the exposure period of the two cameras, the exposure time of the camera mus...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a spectral video collection method based on a DMD variable coding template, which solves the problems of small luminous flux, low collection rate and less collected spectral information in the transmission-type fixed coding template in the existing spectral video collection technology. The implementation steps include: obtaining the dispersion width and direction of the imaging system; designing a coding template; designing a sequence of variable coding templates; transforming the coding template to collect spectral video data frames; using the sliding window method to fuse multiple spectral video data frames collected by different coding templates ; Reconstruct the spectral image. The present invention collects spectral video by designing a plurality of coding templates, and uses it on the computational spectral imaging system based on DMD and complementary all-pass, solves the problem of chromatic aberration of the imaging system, and effectively improves the spectral sampling rate of the imaging system in space. Enables imaging systems to achieve better reconstruction quality. Spectral video with high spatial resolution can be acquired and reconstructed in real time.

Description

technical field [0001] The invention belongs to the technical field of spectral imaging, and mainly relates to the acquisition of spectral video in the technical field of computational spectral imaging, in particular to a spectral video acquisition method based on a DMD variable coding template, which can be used for real-time acquisition and reconstruction of spectral video. Background technique [0002] Compared with ordinary RGB video, spectral video has higher spectral resolution and contains information that cannot be directly observed by the human eye, so it is widely used in agriculture, materials and exploration. However, due to the large number of bands that need to be collected and the large amount of data, the difficulty of spectral video collection is also greatly increased. [0003] Traditional spectral data collection methods include swing-sweep, duster-sweep, and staring-style. What they have in common is collecting local spectral data, and finally splicing th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01J3/28
CPCG01J3/2823Y02A40/10
Inventor 牛毅李豪马明明石光明
Owner XIDIAN UNIV