Adaptive polarization information acquisition and calculation method and device for target detection
A polarization information, target detection technology, applied in the field of optical instruments, can solve the problems of difficult separation of target and background, introduction of large noise, etc.
Active Publication Date: 2019-06-21
HOHAI UNIV
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Problems solved by technology
[0003] Due to the strong water surface specular reflection phenomenon in the water surface environment, a lot of noise will be introduced in the traditional target imaging process, and it is difficult to separate the target from the background by using the light intensity and spectral information of the target
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[0033] like figure 1 As shown, a method for collecting and calculating adaptive polarization information for target detection disclosed in the embodiment of the present invention first adjusts the angle of the cloud platform according to the sun altitude angle at the time of shooting; then adjusts the direction of the polarizer to collect the target in the 0° direction, Polarization images of three polarization directions in the 45° direction and 90° direction; finally, the polarization parameters and polarization degree images of the target are calculated based on the collected polarization images.
[0034] Among them, the calculation principle and method of polarization parameters are as follows:
[0035] Mathematical models such as Figure 5 As shown, the input satisfies θ 1 +θ 2 =k90°, k=1, 2 for a group of polarization images, the output is the difference between polarization images, and two parameters are added to regulate the enhancement or suppression of this group ...
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The invention discloses an adaptive polarization information acquisition and calculating method and device for target detection. The method comprises the following steps: adjusting a pan-tilt angle according to a solar elevation angle at a photographing moment; adjusting the direction of a polarizing film to acquire polarimetric images of a target in three polarization directions of 0-degree, 45-degree and 90-degree; and calculating polarization parameters and polarization degree images of the target in the directions of 0-degree, 90-degree, 45-degree and 135-degree on the basis of the acquired polarimetric images; the device comprises a polarization information collecting unit, a polarization information calculation unit, and a control unit, the polarization information collecting unit can automatically adjust the shooting angle of a camera and the angle of the polarizing film; the polarization information calculation unit calculates polarization parameter information of a water surface target based on the acquired polarization images of the three directions; and the control unit includes an acquisition control module, a storage control module, a polarization information calculation control module and the like. The adaptive polarization information acquisition and calculating method and device can effectively obtain the polarization information of the water surface target.
Description
technical field [0001] The invention relates to an adaptive polarization information acquisition and calculation method and device for target detection, belonging to the technical field of optical instruments. Background technique [0002] The application of image and video processing methods to the detection and identification of water surface targets began in the 1990s, and polarization imaging technology is an imaging technology that has only developed rapidly in recent years. For the detection methods of surface targets, many foreign scholars have conducted a lot of research. At present, the commonly used detection methods of surface targets are classified according to different data acquisition methods, mainly as follows: detection of surface targets based on radar images, detection of surface targets based on infrared images Water surface target detection and water surface target detection based on visible light images. [0003] Due to the strong water surface specula...
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IPC IPC(8): G01C11/00G01C11/02
CPCG01C11/00G01C11/02
Inventor 王慧斌沈洁陈哲徐岑王建华
Owner HOHAI UNIV