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A visible light and SAR image registration method based on linear features and control points

A technology of control points and visible light, applied in image analysis, image data processing, instruments, etc., can solve problems such as straight line mis-matching, algorithm failure, etc.

Active Publication Date: 2012-09-12
陕西中科启航科技有限公司
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Problems solved by technology

Although this method can register visible light images and SAR images containing airport runways, when there are multiple straight line segments with similar positions and slopes in the image, there will often be straight line mis-matching, which will lead to the failure of the algorithm.

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  • A visible light and SAR image registration method based on linear features and control points
  • A visible light and SAR image registration method based on linear features and control points
  • A visible light and SAR image registration method based on linear features and control points

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Embodiment Construction

[0035] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0036] The technical scheme that the embodiment of the present invention solves its technical problem adopts:

[0037] Edge feature detection

[0038]The Canny operator is used to detect the edge of the visible light image, and the ROA operator, which can suppress the multiplicative noise, is used to detect the edge of the SAR image.

[0039] Line Feature Extraction

[0040] The obtained edge image is extracted by using multi-scale discrete fast Beamlet transform to extract line features.

[0041] (c) Coarse registration based on consistent features

[0042] A rough registration method based on feature consistency is adopted. In this transformation model, any one of the visible light or SAR image is used as the reference image, and the other image is used as the image to be registered. The coordinate point relationship of the two images satisfies the following...

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Abstract

The present invention relates to a visible light and SAR image registration method based on linear features and control points. The method carries out edge detections respectively of visible light and an SAR image by using a Canny operator and an ROA (Ratio of Averages) operator according to features of visible light and the SAR image, extracts linear features by employing a multi-scale discrete fast Beamlet transform method, structures control points based on linear features, and realizes coarse-to-fine registration on images to be registered by using a coarse registration method based on consistent features and a fine registration method based on control points. The beneficial effect of the method lies in the fact that mismatching in single straight line matching caused by difference in length and location is prevented, point matching precision is improved, the method is suitable not only for SAR and visible light image registration, but also for registration of images with same edge features due to the employment of registration algorithm based on linear features and control points features.

Description

technical field [0001] The invention relates to a visible light and SAR image registration method based on line features and control points, which overcomes the disadvantage that the existing image registration algorithm is not applicable to heterogeneous images and has relatively low gray level correlation. Background technique [0002] With the rapid development of aviation science and remote sensing technology and the continuous updating of new sensors, people’s ability to obtain remote sensing image data has been continuously improved. In the same area, a large number of remote sensing images of different scales, different perspectives, different time periods, and different spectral information can be obtained. Registration of heterogeneous images has become a research hotspot in remote sensing image processing and interpretation. In particular, SAR images and visible light images have indispensable complementary advantages, but the completely different imaging mechanism...

Claims

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Application Information

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IPC IPC(8): G06T7/00
Inventor 李映崔杨杨韩晓宇张艳宁
Owner 陕西中科启航科技有限公司
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