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A method for simulating the influence of micro-vibration on image quality

An image quality and micro-vibration technology, applied in the field of image simulation, can solve the problem of not being able to directly obtain the visualization effect of micro-vibration on image quality.

Active Publication Date: 2018-08-14
BEIJING INST OF SPACECRAFT SYST ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0027] The above formula only shows the effect of camera boresight LOS shaking on the MTF of the optical system, and cannot directly visualize the effect of micro-vibration on image quality

Method used

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  • A method for simulating the influence of micro-vibration on image quality
  • A method for simulating the influence of micro-vibration on image quality
  • A method for simulating the influence of micro-vibration on image quality

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Embodiment 1

[0049] The simulation method of the influence of micro-vibration on image quality, in the case of camera boresight shake caused by known micro-vibration, analyzes the boresight shake, and gives the LOS shake components of different frequencies. On this basis, according to different influence mechanisms, The redistribution and distribution of pixel energy caused by LOS shaking are given, so as to realize the purpose of simulating the influence of micro-vibration on image quality.

[0050] The basic principle is: currently the ground optical remote sensing cameras are mainly TDI CCD cameras. At each imaging moment (single camera integration time), the shaking of the camera's boresight LOS will bring about two effects. One is that the energy of the ground object image caused by the large shaking is distributed to other pixels; the other is that the energy of the ground object caused by the small shaking is redistributed in adjacent pixels. These two effects generally exist at the...

Embodiment 2

[0062] 1. First, given the LOS and the image to be simulated, enter the figure 2 with image 3 Shown:

[0063] 2. According to the aforementioned simulation process, the time needs to be registered first. Registration includes two aspects. First, the time period of LOS corresponding to each row of images needs to be registered. Secondly, it is necessary to analyze the LOS during this time period. Generally speaking, the integration time of a remote sensing satellite is 10 -4 Second order, therefore, the LOS shakes as a linear motion within this time period. Physically, at 10 -4 In the order of seconds, and in the order of 10kHz, the structural vibration is already very small. Relatively large vibrations are in the frequency band of about 0.01-100Hz. Therefore, the shaking of LOS in the single-stage integration time can be considered as linear motion from a physical analysis. The maximum value of LOS wobble within the time period that can be obtained at this time. This...

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Abstract

The invention discloses a method for simulating the influence of micro-vibration on image quality, comprising the following steps: using TDICCD to collect and acquire on-orbit images; acquiring LOS shaking data of the camera boresight to be simulated, and distributing the LOS shaking data to the on-orbit images At the moment corresponding to each row of pixels; for the on-orbit image, the current analysis direction is respectively perpendicular to the push-broom direction and along the push-broom direction, and the following process is performed for the corresponding pixel at each moment: Calculate the LOS shaking amplitude and image The ratio of the element size; the ratio is rounded down to obtain the large energy of LOS shaking; the pixel corresponding to the current moment is translated in the current analysis direction by the value corresponding to the large energy of LOS shaking; the ratio is subtracted from the large energy of LOS shaking , to get the small energy λ of LOS shaking; (1‑λ) times the energy of the corresponding pixel at the current moment before the translation, plus λ times the energy of the corresponding pixel at the current moment after the translation, update the corresponding pixel at the current moment Energy value.

Description

technical field [0001] The invention belongs to the field of image simulation, and in particular relates to a method for simulating the influence of micro-vibration on image quality. Background technique [0002] Micro-vibration refers to the small amplitude of the spacecraft caused by the normal operation of the equipped equipment (such as high-speed rotating parts such as momentum wheels, stepping parts such as solar wing drive mechanisms, and swinging parts such as infrared camera swing mirrors) during the spacecraft’s orbital operation. reciprocating motion. Micro-vibration source refers to the equipment that causes micro-vibration. The micro-vibration energy is very small, compared with the strain caused by the mechanical environment of the launch section, the micro-vibration is at least one order of magnitude smaller, and will not cause structural damage. In addition to the small amplitude, the frequency range of micro-vibration is very wide, and the attitude control...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232H04N17/00
CPCH04N17/002H04N23/681
Inventor 庞世伟郭倩蕊张媚李晓云朱卫红王泽宇
Owner BEIJING INST OF SPACECRAFT SYST ENG
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