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Moving target shadow detection method using road information

A shadow detection and moving target technology, applied in the field of signal processing, can solve the problems of difficult detection and high-precision positioning, moving target defocus and position offset, etc., to reduce false alarms in shadow detection, efficient detection, and improve detection efficiency Effect

Pending Publication Date: 2022-05-03
CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
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AI Technical Summary

Problems solved by technology

In SAR images, moving targets have defocus and position offset, making it difficult to be detected and positioned with high precision

Method used

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  • Moving target shadow detection method using road information
  • Moving target shadow detection method using road information
  • Moving target shadow detection method using road information

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Embodiment Construction

[0019] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0020] SAR images such as figure 1 As shown, the size of the Gaussian filter is [40,40], the standard deviation is 7, and the Gaussian smoothing filter SAR image I reduces the influence of speckle noise on edge detection. The smoothed SAR image I′, such as figure 2 shown.

[0021] Use the Canny operator to do edge detection on I', and get the edge information image I' of SAR e ,Such as image 3 As shown, choose the threshold T bw1 =10, binarized image I' e , to get the binary image I′ bw ,Such as Figure 4 shown.

[0022] The row and column dimensions of image I are N respectively r = 1680 and N c =1350, for binary image I' bw Do Radon transform to get the two-dimensional map of angle and distance, such as Figure 5 As shown, the row coordinates are angles, the column coordinates are distances, and the calculated slope k=1.732...

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Abstract

The invention discloses a moving target shadow detection method utilizing road information, which comprises the following steps: extracting road edge information by adopting edge detection and straight line detection, eliminating clutter regions outside a road, and obtaining an ROI (Region of Interest) region of an SAR (Synthetic Aperture Radar) image; the edge detection is adopted to remove clutters and part of connected regions, the part of connected regions are combined, a shadow detection result is obtained, in a specific scene, the moving target shadow is efficiently detected, the shadow detection false alarm is reduced, and the detection efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a target detection technology. Background technique [0002] Moving target detection, tracking and positioning are important tasks of video SAR, and target detection is the premise of target tracking and positioning. In SAR images, moving targets have defocus and position offset, which are difficult to be detected and positioned with high precision. The shadow can reflect the real position of the target, and it is very important to detect the shadow of the moving target. [0003] Methods for detecting moving targets in SAR images include: [0004] In "Single High-Resolution SAR Image Moving Target Detection Method Based on Shadow Detection", a moving target detection method based on a single SAR image is disclosed. The method realizes the detection of the moving target through the detection of the shadow area, and combines the road auxiliary information t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/13G06T7/136G06T7/187
CPCG06T7/0002G06T7/13G06T7/136G06T7/187G06T2207/10044G06T2207/20104G06T2207/20024
Inventor 尚士泽吴福伟杨予昊李大圣金林
Owner CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
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