MTF (Modulation Transfer Function) parameter testing method under condition of nonideal target

A parametric testing, non-ideal technology, applied in the field of electronic information, can solve problems such as difficulty, cumbersome, unable to obtain line expansion function, etc., to achieve the effect of convenient selection of edges

Inactive Publication Date: 2010-08-04
CENT FOR EARTH OBSERVATION & DIGITAL EARTH CHINESE ACADEMY OF SCI
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Problems solved by technology

The ground target must be set in advance in the area where the satellite passes, and the image acquisition is greatly affected by the weather and the satellite orbit. If the edge of other ground objects is used, the requirements for the edge shape and imaging quality are high, and it is difficult to find a very good target in many cases. The flat and ideal edge of the ground object, and during the operation of the satellite, due to equipment aging and other influences,

Method used

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  • MTF (Modulation Transfer Function) parameter testing method under condition of nonideal target
  • MTF (Modulation Transfer Function) parameter testing method under condition of nonideal target
  • MTF (Modulation Transfer Function) parameter testing method under condition of nonideal target

Examples

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Effect test

Embodiment 1

[0033] Example 1: Using the edge of the moon to extract the MTF parameters of the sensor

[0034] like Figure 3a As shown, when the imaging device does not have a suitable target or target as a reference for extracting MTF parameters, the image of the edge of the moon 1 can be used to extract the MTF parameters of the sensor. The artificially set targets are generally flat areas Or an obvious linear target, the extraction of the edge extension function is very easy at this time, but the edge of the moon is a curve, and the extraction of the edge extension function is more difficult. Method of the present invention at first utilizes mouse to select the start point and end point of edge, then can automatically search for a reasonable edge from start point to end point and segmental sampling generates edge extension function, then through edge fitting (such as Figure 3b ), derivation to obtain the line extension function (such as Figure 3c ), Fourier transform and other stag...

Embodiment 2

[0035] Example 2: Using Antarctic ice sheet images to extract MTF parameters of orbiting satellites

[0036]Under normal circumstances, a target needs to be set on the ground, and the sensor on the satellite can test the MTF parameters by imaging the target. Since the setting of the target image requires ground cooperation, it is very inconvenient, especially affected by satellite orbit and weather changes. like Figure 4a As shown, when there is no suitable target image as a reference, the reference image extracted based on this method and using the junction of the Antarctic ice sheet 2 and seawater 3 as MTF parameters can be used. At this time, the biggest difficulty is that the shape of the Antarctic ice sheet is generally not very regular. Using this method, it is relatively easy to accurately obtain the edge of the Antarctic ice sheet 1 in a complex background. With the edge, the edge extension function (such as Figure 4b ), line extension functions (such as Figure 4...

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Abstract

The invention relates to an MTF (Modulation Transfer Function) parameter testing method under the condition of a nonideal target. The method is characterized by comprising the following steps of: (1) establishing a weight map for a special remote sensing image containing margins on the basis of image features; (2) setting a starting point and a terminating point on the margin, and calculating the shortest path from the starting point to the terminating point in the weight map on the basis of dynamic planning; (3) sampling the image grey value to form a margin spread function at a certain distance in the direction vertical to the shortest path, fitting and solving the margin spread function to obtain the line spread function, and carrying out Fourier transform on the line spread function to obtain an MTF curve; (4) repeating the steps 1-3 several times, and taking average values multiple times to reduce error. The invention not only can be used under the ideal conditions of having a target and a margin, but also can extract an MTF parameter by utilizing the targets with irregular shapes, ,thereby enabling the margin selection to be convenient, flexible and accurate.

Description

technical field [0001] The invention relates to the technical field of electronic information, in particular to a method for testing MTF parameters under the condition of non-ideal targets. Background technique [0002] At present, the methods for extracting MTF (Modulation Transfer Function, satellite image modulation transfer function) parameters of orbiting satellites all require matching targets on the ground or images with very regular edges. The ground target must be set in advance in the area where the satellite passes, and the image acquisition is greatly affected by the weather and the satellite orbit. If the edge of other ground objects is used, the requirements for the edge shape and imaging quality are high, and it is difficult to find a very good target in many cases. The flat and ideal edge of the ground object, and during the operation of the satellite, due to equipment aging and other influences, the performance of the sensor is constantly changing, so it is ...

Claims

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Application Information

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IPC IPC(8): G01M11/02G06T5/00
Inventor 刘鹏刘定生
Owner CENT FOR EARTH OBSERVATION & DIGITAL EARTH CHINESE ACADEMY OF SCI
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