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A Visible Light Imaging Method for Space Objects Based on Spectral Brdf

An imaging method and space target technology, applied in the fields of identification, detection and tracking of space targets, can solve problems such as scientific problems that cannot be applied, and achieve the effect of accurate visible light scattering brightness value

Active Publication Date: 2017-09-08
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, RGB-based image display is only used for computer display and cannot be applied to scientific problems

Method used

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  • A Visible Light Imaging Method for Space Objects Based on Spectral Brdf
  • A Visible Light Imaging Method for Space Objects Based on Spectral Brdf
  • A Visible Light Imaging Method for Space Objects Based on Spectral Brdf

Examples

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Effect test

Embodiment 1

[0046] Take a cone with a radius of 0.25m and a height of 1m as an example, assuming that the incident light source is as follows Figure 5 The solar spectrum shown, the angle of incidence and angle of acceptance are defined as Image 6shown. because Figure 5 The incident spectrum in is the illuminance distribution under direct sunlight, E in formula (4) i should be changed to

[0047]

[0048] Among them, E sun (λ) is Figure 5 The solar illuminance distribution shown in , θ i is the angle between the incident direction and the surface element normal. cos(θ i ) can be obtained from the dot product of the incident direction vector and the normal vector of the surface element.

[0049] Since the main innovation of this patent is to obtain the visible light scattering brightness of the visible surface elements based on the spectral BRDF of the target surface material and then obtain the visible light imaging of the target, it does not pay attention to the focal len...

Embodiment 2

[0051] The visible light measurement camera installed on the spacecraft can image another space-based target in the illuminated area, and provide measurement information such as the line-of-sight angle of the target in the camera based on the image and related algorithms, which is used to adjust the direction of motion of the spacecraft during space docking Provide the necessary information. Schematic such as Figure 8 shown.

[0052] Before the satellite is launched, it is impossible to determine the imaging effect of the visible light camera. Therefore, it is necessary to simulate and calculate the visible light imaging of the target star by the visible light camera during space docking, and use the simulation results to determine whether the selected camera is suitable.

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Abstract

The invention discloses a space target visible light imaging method based on spectrum BRDF (Bidirectional Reflectance Distribution Function). The space target visible light imaging method based on spectrum BRDF comprises the following steps: performing geometric modeling and surface element division to a target, endowing different surface elements with different surface element numbers, obtaining spectrum BRDF models of different target surfaces, representing the light scattering characteristic of the material surface by a spectrum BRDF file, blanking and judging the target, and removing the surface elements which cannot be shined or cannot receive or are shielded; converting angles of incidence and angles of scattering in the target coordinate system into a surface element coordinate system; computing the visible light scattering luminance of each visible surface element; projecting each visible surface element to an image plane, and thus obtaining the visible light imaging result in the image plane. According to the space target visible light imaging method based on spectrum BRDF provided by the invention, the obtained visible light scattering luminance value is more accurate, and thus the space target visible light imaging method based on spectrum BRDF can be applied to scientific problems.

Description

technical field [0001] The invention belongs to the technical field of detection, tracking and recognition of space targets, and relates to a visible light imaging method of space targets based on spectral BRDF. Background technique [0002] At present, space surveillance satellites and space docking in various countries have applied space-borne visible light imaging detectors, using visible light images of space targets to assist in space target monitoring and space target docking. In the prior art, RGB-based image display is only used for computer display, and cannot be applied to scientific problems. Contents of the invention [0003] In order to overcome the defects existing in the prior art, the present invention provides a space target visible light imaging method based on spectral BRDF, starting from the visible light scattering characteristics of the space target itself, researches a space target visible light imaging method based on the space target surface spectr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 曹运华白璐吴振森李海英李艳辉
Owner XIDIAN UNIV