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Object image mapping restoration method for mirror geometric distortion under large-attitude-angle imaging of area-array camera

An area array camera and geometric distortion technology, which is applied in the imaging field of aerospace area array cameras, can solve the problems of inconsistency in the resolution of ground objects on the image plane, geometric distortion, etc., and achieve the effect of wide coverage and simple method

Active Publication Date: 2018-09-28
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] In order to solve the technical problem of inconsistency in the resolution of ground objects on the image plane under the condition of large attitude angle imaging of the area array camera, the present invention provides an object image mapping restoration method for the geometric distortion of the imaging mirror image of the area array camera with a large attitude angle

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  • Object image mapping restoration method for mirror geometric distortion under large-attitude-angle imaging of area-array camera
  • Object image mapping restoration method for mirror geometric distortion under large-attitude-angle imaging of area-array camera
  • Object image mapping restoration method for mirror geometric distortion under large-attitude-angle imaging of area-array camera

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specific Embodiment approach 1

[0033] Specific implementation mode 1. Combination Figure 1 to Figure 6 In this embodiment, the object image mapping restoration method of large attitude angle imaging mirror geometric distortion of the area array camera, the corresponding relationship between the sub-satellite point imaging and the roll angle imaging ground scene and the image plane is as follows figure 1 shown. This method mainly determines the expansion range of the trapezoidal image according to the object image mapping relationship of large field of view imaging, and restores the geometric distortion process of area array camera large field of view imaging, such as figure 2 As shown, o is the sub-satellite point, is the attitude angle. The specific method is:

[0034] 1. Read the roll attitude angle as , the number of pixels I(m, n) in the length and width direction of the area array camera imaging image plane image, that is, there are m columns of pixels in the length direction and n rows of pixe...

specific Embodiment approach 2

[0053] Specific implementation mode 2. This implementation mode is a specific example of the object image mapping restoration method for the geometric distortion of the large attitude angle imaging mirror image of the area array camera described in the specific implementation mode 1:

[0054] 1. Read the attitude angle as , the number of pixels in the length and width directions of the image plane image of the area array camera I(4000,3000).

[0055] 2. Calculate the half field of view corresponding to different columns of pixels on the image plane of the area array camera.

[0056] Assume that the edge point C’(-0.028,-0.0105) of the first column of pixels on the image plane of the area array camera, the focal length of the camera is f=7m, and the pixel size is 7um. Schematic such as image 3 shown.

[0057] Substitute the known conditions into the following formula:

[0058]

[0059] η can be calculated 1 =0.086°, for η i By iterative calculation, the half field an...

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Abstract

The invention discloses an object image mapping restoration method for mirror geometric distortion under large-attitude-angle imaging of an area-array camera, relates to the field of aerospace area-array camera imaging, and mainly solves the technical problem of image mirror geometric distortion of an image surface due to inconsistent ground object resolution under the large-attitude-angle imagingcondition of an existing area-array camera. Starting from an area-array camera imaging principle, a working principle, a projection mapping relationship during the large-attitude-angle imaging and avisual field angle invariance principle of the area-array camera are comprehensively considered, a restoration process of area-array camera imaging is proposed, and an object image size restoration formula for optimally correcting the image geometric distortion is given; the method is simple and easy; and the correction of the geometric distortion under the large-attitude-angle imaging of the area-array camera can be realized according to an inverse process of imaging.

Description

technical field [0001] The invention relates to the imaging field of aerospace area array cameras, in particular to a restoration method for image mapping of imaging objects under large attitude angles of area array cameras. Background technique [0002] In the field of aerospace optical imaging, area array CMOS devices with high frame rate and high signal-to-noise ratio have been widely used in the acquisition of regional targets. Due to the uncertainty in the distribution of targets in the observation area, it is necessary for the satellite to be agile and maneuver to complete the accurate detection of the area to be observed. imaging. However, as the attitude angle of the satellite changes, the imaging object distance of the area array camera and the corresponding ground resolution also change in real time. Therefore, under the imaging condition of a large side swing angle of the satellite, the resolution of the corresponding ground object on the image plane is inconsiste...

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Application Information

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IPC IPC(8): G06T5/00G06T3/40
CPCG06T3/4007G06T2207/10032G06T5/80
Inventor 杨秀彬朱琳王家骐金光王旻
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI