In-orbit focusing method of earth observation satellite-borne visible light transmission camera

An earth observation and visible light technology, applied in the field of on-orbit focusing, can solve the problems of poor stability of focusing method and failure of focusing algorithm, and achieve the effect of shortening focusing period, high accuracy and improving stability.

Active Publication Date: 2016-10-12
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For linear array CCD cameras that image in push-broom mode, there is no identical part between two consecutive images, and changes in the scene lead to the failure of commonly used focusing algorithms. Generally, only a combination of subjective and objective evaluat

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
  • In-orbit focusing method of earth observation satellite-borne visible light transmission camera
  • In-orbit focusing method of earth observation satellite-borne visible light transmission camera
  • In-orbit focusing method of earth observation satellite-borne visible light transmission camera

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0059] Table 1 shows the parameters required for camera focusing;

[0060] Such as figure 1 Shown, the realization process of the present invention is:

[0061] 1) Confirm that the on-orbit imaging parameters of the camera are adjusted in place, and obtain the camera's central wavelength, relative aperture, focusing step, focusing magnification, pixel size, focusing range and other parameters, as shown in Table 1;

[0062] Table 1

[0063] serial number

project name

unit

Test / Design Results

1

center wavelength

μm

2

relative aperture

none

3

Focus step

μm

4

Focus magnification

none

5

pixel size

μm

6

Focus range

μm

[0064] 2) According to the central wavelength λ obtained in step 1), the reciprocal F of the relative aperture, the focusing step distance l, and the focusing magnification n, calculate the half focal depth of the camera Δ a...

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 present invention discloses an in-orbit focusing method of an earth observation satellite-borne visible light transmission camera. When an optical system of the camera defocuses to a certain extent, an image frequency domain formed by the camera has a zero point; according to a camera image out of focus, a zero point position can be found in the frequency domain; when the zero point position of the frequency domain is known, a radius of a point divergent function caused by defocusing is calculated according to the position of the zero point and a best focal plane position is estimated, and a focusing direction is determined according to the definition of an image formed by different focal plane positions, so as to determine the best focal plane position; and when the image frequency domain has no zero point, the camera is nearby the best focal plane position, the focusing adjustment direction is determined by calculating the definition of the nearby focal plane image, so as to determine the best focal plane position. Through adoption of the method, high-accuracy and efficiency of in-orbit focusing are ensured, and in-orbit imaging performance and image quality of an optical remote sensor are improved.

Description

technical field [0001] The invention relates to an on-orbit focusing method of a space-borne visible light transmission camera for earth observation, belonging to the technical field of aerospace optics and remote sensing. Background technique [0002] Camera defocus is an important factor affecting the quality of satellite imaging. After the satellite is launched, the focal plane position of the camera must be rechecked, and the camera should be adjusted on-orbit if necessary. Therefore, in order to improve the on-orbit imaging quality of satellites, it is necessary to carry out research on the on-orbit focusing method of the camera and the judging method of the focusing effect. [0003] At present, the domestic remote sensing cameras all adopt the focusing method of moving the focal plane. In addition to this method, foreign cameras also adopt other methods, such as SPOT-1, SPOT-4, and SPOT-5, which adopt the dual-camera contrast focusing method. Therefore, it is first ne...

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
IPC IPC(8): H04N5/232G02B7/36
CPCG02B7/36H04N23/67
Inventor 李方琦谭伟齐文雯何红艳邢坤刘薇高慧婷张智江澄曹世翔
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap