Frequency domain weighting correlation method for image registration

A frequency domain weighting and image registration technology, applied in image enhancement, image data processing, instruments, etc., can solve the problem of not taking into account the influence of noise and non-ideal sampling, the accuracy of traditional phase correlation algorithms, and the impossibility of signal processing systems. Problems such as large sampling frequency
CN101976434AInactive Publication Date: 2011-02-16ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2011-02-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a frequency domain weighting correlation method for image registration, which comprises the following steps of: windowing two images to be registered to acquire images for inhibiting frequency spectra from leaking; performing discrete Fourier transform on the images to acquire the frequency spectra and removing a high-frequency part from the frequency spectra of the images by using a low-pass filter; substituting the remaining frequency spectra into a phase weighting correlation expression to obtain a correlation peak frequency domain expression, performing inverse discrete Fourier transform to obtain the correlation peak of a pixel domain and finding coordinates with a maximum value to obtain the displacement value of the whole pixel; and performing binary quartic surface fitting on the periphery of a peak value, performing interpolation calculation to obtain the displacement value of a sub-pixel and adding the displacement value of the whole pixel and the displacement value of the sub-pixel to obtain the registration displacement of sub-pixel accuracy between the two images. The frequency domain weighting correlation method for the image registration has high registration accuracy on digital images and high robustness on scenes and signal-to-noise ratio, and is suitable for the field of the processing of various digital images.
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Description

technical field

[0001] The invention relates to the technical field of computer image registration, in particular to a related method for frequency domain weighting for image registration. Background technique

[0002] Obtaining the relative displacement between two images is an important research content of image registration, which is widely used in various digital image processing fields, such as image stitching, super-resolution reconstruction of remote sensing images, high dynamic contrast (HDR) image construction, real-time Image stabilization technology, motion blur image restoration, etc.

[0003] With the development of digital image processing technology, many image registration methods have emerged. In summary, these methods can be roughly divided into: direct methods (Irani M, Anandan P.About Direct Methods.Lecture notes in computer science.Springer.1999: 267-277) and feature-based methods (Torr P H S, Zisserman A. Feature based methods for structure and motion ...

Claims

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