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Multi-angle automatic MTF estimation method of remote sensing image

A remote sensing image and multi-angle technology, applied in the field of remote sensing applications, can solve problems such as the MTF calculation of satellite remote sensors

Inactive Publication Date: 2015-04-22
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, this method can only be carried out in a laboratory state, and cannot be used to calculate the MTF of satellite remote sensors in orbit

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  • Multi-angle automatic MTF estimation method of remote sensing image
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  • Multi-angle automatic MTF estimation method of remote sensing image

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Embodiment Construction

[0048] In order to better understand the technical content of the present invention, specific embodiments are given together with the attached drawings for description as follows.

[0049] Aspects of the invention are described in this disclosure with reference to the accompanying drawings, which show a number of illustrated embodiments. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be understood that the various concepts and embodiments described above, as well as those concepts and embodiments described in more detail below, can be implemented in any of a number of ways, which should be the concepts and embodiments disclosed by the present invention and not Not limited to any implementation. In addition, some aspects of the present disclosure may be used alone or in any suitable combination with other aspects of the present disclosure.

[0050] combine Figure 24 As shown in the process, the multi-ang...

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Abstract

The invention provides a multi-angle automatic MTF estimation method of a remote sensing image. The method comprises the two processes of selecting image blocks and estimating an MTF based on the edge method. The process of selecting the image blocks comprises the steps of rotating an original image by multiple angles to obtain a rotated image, carrying out edge point extraction on the rotated image and the original image to obtain four edge point images, and selecting the image blocks for estimating the MTF with the four edge point images as the reference. The process of estimating the MTF based on the edge method comprises the steps of carrying out edge detection on the obtained image blocks to obtain the positions of edge points, namely, the positions of sub-pixel points of the edge points, fitting the edges of the image blocks through the least square method, carrying out interpolation and average edge spread function extraction on the fit edges of the images blocks, carrying out simple differencing on an average edge spread function to obtain a line spread function, fitting the line spread function through Gaussian distribution, carrying out discrete Fourier transformation on the fit line spread function, and carrying out model extraction on the result to obtain a final MTF series.

Description

technical field [0001] The invention belongs to the field of remote sensing applications, and in particular relates to a multi-angle automatic MTF estimation method of remote sensing images. Background technique [0002] In the field of remote sensing applications, modulation transfer function (MTF) is an important comprehensive evaluation index of remote sensing optical imaging system. The MTF of the imaging system directly affects the quality of the imaging: the lower the MTF, the more blurred the edge texture and other details of the obtained remote sensing image. For in-orbit satellite remote sensors, due to the influence of harsh factors such as satellite launch, multiple attitude adjustments during orbit keeping, cosmic space radiation, and temperature difference between day and night, the imaging performance of remote sensors will gradually decline, and the quality of remote sensing images will gradually decrease. worse. It is of great significance to detect the MTF...

Claims

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Application Information

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IPC IPC(8): G06T7/00
CPCG06T7/12G06T2207/10032
Inventor 纪则轩孙权森刘金尧贾惠珍査艺易赵家成王明良
Owner NANJING UNIV OF SCI & TECH
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