Global motion detection method based on joint transformation correlator

A technology of global motion and detection method, which is applied in the direction of using devices, instruments, and measuring devices that measure the time required to move a certain distance.

Inactive Publication Date: 2011-06-29
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

And the result of the correlation operation is accurate, but because the digital image correlation operation needs to go through two Fourier transforms, the amount of calculation is huge

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  • Global motion detection method based on joint transformation correlator
  • Global motion detection method based on joint transformation correlator
  • Global motion detection method based on joint transformation correlator

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Embodiment Construction

[0036] According to the real-time correlation processing method described in the manual, the system is to be mounted on a motion imaging platform, and the structure of the joint transform correlator is required to be compact, and the size should not be too large. One optical path of the joint transform correlator can be integrated into a 30mmX30mmX290mm In a cuboid metal box, such as Figure 6 shown. Among them, the sampling CCD specification is 512X512 pixels, and the sampling frame rate can reach a high-speed CCD with a frame rate of 100 frames; the semiconductor laser with a wavelength range of 636nm to 641nm is selected. Due to the small size of the semiconductor laser, it is very suitable for compact structure requirements.

[0037] The SLM is implemented with a ferroelectric liquid crystal with a specification of 512X512 pixels and a refresh rate greater than 100Hz.

[0038] The focal length of the Fourier lens is determined by the pixel size of the detector and the wav...

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Abstract

The invention discloses a global motion detection method based on a joint transform correlator. A high-frame frequency small surface array detector is adopted as a sampling unit, an optical joint transform correlator is adopted as a Fourier transform simulation processing unit, a DSP (Digital Signal Processor) is used to realize the correlation peak real-time detection algorithm, and the high-precision real-time motion vector detection is finally achieved. The method is insensitive to the noise of an input image and has strong anti-jamming capability; the displacement detection results are accurate; and the measurement precision can reach one pixel level.

Description

Technical field: [0001] The invention relates to motion detection technology for digital image processing. Specifically, it refers to a global motion detection method based on a joint transform correlator, which can be widely used in fields such as electronic image stabilization and image motion compensation. Background technique: [0002] Electronic image stabilization technology is a new generation of sequential image stabilization technology that integrates electronics, computer, digital signal processing and other technologies. It is different from image restoration, image restoration is for each blurred image, and electronic image stabilization is an image sequence, and each frame image in the sequence is clear. The basic principle of image stabilization is: firstly, local motion estimation and global motion estimation are performed according to various information of the image sequence, after obtaining motion parameters, comprehensive evaluation is performed, and then...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/80G01P13/02
Inventor 周伟丁雷李丹
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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