An Image Registration Method for Interferometric Synthetic Aperture LiDAR System

An interferometric synthetic aperture and lidar technology, which is applied in image analysis, image enhancement, image data processing, etc., can solve the problems of poor single-view registration effect and slow registration speed, and improve registration efficiency, accuracy, and registration accuracy. The effect of fast alignment speed and high registration accuracy

Inactive Publication Date: 2019-06-11
HARBIN INST OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the InSAR registration method has poor single-view registration effect and slow registration speed for the InSAL system containing Gaussian white noise, thereby providing an image registration method for an interferometric synthetic aperture laser radar system

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  • An Image Registration Method for Interferometric Synthetic Aperture LiDAR System
  • An Image Registration Method for Interferometric Synthetic Aperture LiDAR System

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specific Embodiment approach 1

[0020] Specific implementation mode one: combine figure 1 Specifically explaining this embodiment, an image registration method for an interferometric synthetic aperture lidar system described in this embodiment includes the following steps:

[0021] Step 1. Select a reference point on the main image, and delineate a 21×21 area centered on the reference point as the registration window;

[0022] Select a point corresponding to the reference point on the main image on the auxiliary image, delineate a 300×300 area centered on this point, and select a 21×21 area in this area to register with the registration window according to the correlation coefficient , so as to estimate the scale of registration translation;

[0023] Step 2. Select multiple standard points on the main image, and define a 21×21 area centered on one standard point as the registration window. On the auxiliary image, according to the scale of the registration translation estimated in step 1, draw Set a search ...

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Abstract

The invention provides an image registration method of an interference synthesis aperture laser radar system and relates to an image registration algorithm of an InSAL system. The objective of the invention is to solve problems of poor registration effects and slow registration speed of current InSAR registration method. The provided method comprises steps of estimating the scale of registration translation; using the maximum correlation function as a registration scale to carry out standard point coarse registration; defining segmentation positions, wherein a standard point between two segmentation positions is a near-zero Doppler position standard point; using a spectrum registration method to obtain a standard point refined registration offset; standard points outside the two segmentation positions are far-zero Doppler position standard points; using the maximum correlation function to be the registration scale to obtain standard point refined registration offsets; combining the standard point refined registration offsets to obtain a standard point refined registration offset matrix of a main image; determining an offset of any pixel in the main image; and according to the offset, using the cubic spline function interpolation method to carry out repeated sampling on an auxiliary image. The image registration method is suitable for image registration of the InSAL system.

Description

technical field [0001] The invention relates to an image registration method of an InSAL system. Background technique [0002] The image registration method of the InSAL (Interferometric Synthetic Aperture Lidar) system is generally implemented by the InSAR algorithm, but the source of the system noise is different due to the different signal sources of the system. In the general InSAR (Synthetic Aperture Radar Interferometry) system, various forms of radio frequency signals come from the radar frequency synthesizer. At present, the radar frequency synthesizer uses the oscillator as the reference source, and its frequency drift and phase noise will directly affect the accuracy and reliability of the system. As for InSAL, since the echo reception of InSAL relies on photodetectors, the main noise sources of photodetectors are shot noise and thermal noise. Among them, shot noise includes shot noise of signal light, background light and dark current. The registration algorith...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/89G06T7/33
CPCG01S17/90G06T2207/10044
Inventor 张勇邱鹏宇赵远
Owner HARBIN INST OF TECH
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