Push-scan type space camera image on-orbit real-time restoration method

An aerospace camera and push-broom technology, which is applied in the field of space optical remote sensing, can solve the problems of lack of real-time performance and limit the application of aerospace optical remote sensing, and achieve the effect of reducing performance requirements and design difficulties, improving imaging performance, and high practical value.

Inactive Publication Date: 2015-02-11
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] However, the existing image restoration methods are all post-processing of remote sensing images, that is, sending remote sensing images captured by aerospace cameras to the ground

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  • Push-scan type space camera image on-orbit real-time restoration method
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  • Push-scan type space camera image on-orbit real-time restoration method

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Embodiment Construction

[0032] Specific implementation examples

[0033] Taking the most typical linear filtering method—Wiener filtering method as an example, an example of the present invention combining this method to realize on-orbit real-time deconvolution and restoration of images is given:

[0034] Step 1: Use existing relatively mature methods (such as point light source method, inclined edge method, rectangular pulse method and radiation target method, etc., see relevant literature for details), or use an improved method for existing mature methods Estimate the point spread function. Get a more accurate on-orbit normalization h(x,y), such as image 3 shown.

[0035] Step 2: For the above formula (1): g(x,y)=h(x,y)*f(x,y)+n(x,y) shows that the degradation of the image in the space domain usually requires It is processed in the frequency domain, that is, the convolution in the space domain becomes the product in the frequency domain, and the Fourier transform is performed on both sides of (...

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Abstract

A push-scan type space camera image on-orbit real-time restoration method. The method is based on a relatively mature linear filtering method, components except for frequency domain information of an image to be restored in a frequency domain expression of the linear filtering restoration method are separately put forward and are converted to a spatial domain, a main part of energy distribution in the spatial domain is captured as a small-sized spatial domain deconvolution template, and in combination with an embedded hardware system, spatial domain convolution real-time restoration of ground scene information obtained by a camera is performed, thereby solving the problem of real-time restoration of a space camera image. By adoption of a space camera system provided by the invention, a degraded remote sensing image is no longer output, and a reconstructed image by estimation of restoration of a photographed scene is output.

Description

technical field [0001] The invention belongs to the technical field of space optical remote sensing, and in particular relates to a real-time restoration method of a push-broom space camera image on orbit. Background technique [0002] The linear push-broom space camera is currently the most widely used space camera, and its imaging principle is as follows: figure 1 shown. Let the ground scene captured by the aerospace camera be f(x, y), and the remote sensing image g(x, y) obtained after passing through the camera system can be expressed as: [0003] g(x,y)=h(x,y)*f(x,y)+n(x,y) (1) [0004] (1) In the formula, h(x, y) is the characteristic function of the aerospace camera system—the point spread function (PSF), n(x, y) is the noise, and * means convolution. The above formula shows that the remote sensing image obtained by the aerospace camera is not a true reproduction of the ground scene, but degenerates during the imaging process, resulting in a degraded image. [000...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 付天骄张立国郭玲玲任建岳李亚鹏
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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