An atmospheric turbulence degeneration video fast stabilizing method based on a Riesz pyramid

Abstract

The invention discloses a rapid atmospheric turbulence degradation video stabilizing method based on a Riesz pyramid. The rapid atmospheric turbulence degradation video stabilizing method comprises the following steps of: 1, performing pyramid decomposition on each frame of image of a video; and 2, calculating the local amplitude and the local phase of each layer of sub-band of the pyramid based on Riesz transformation; and 3, performing time low-pass filtering on the local amplitude and the local phase; and 4, deblurring the single-frame image based on the atmospheric turbulence modulation transfer function. According to the invention, imaging distortion generated by an atmospheric turbulence effect is eliminated by using a low-pass filtering idea. Riesz transformation is multi-dimensional expansion of Hilbert transformation, and local amplitude and local phase information of the two-dimensional signal can be obtained by the Riesz transformation. Wherein the local amplitude reflects the light and shade change of the local gray level of each frame of image in the video, and the local phase change represents the local motion information in the video. And local high-frequency noise and image distortion can be suppressed through low-pass filtering of the unicast local amplitude and the local phase.

Description

technical field

[0001] The invention relates to the technical fields of optical imaging and digital images, in particular to a fast stabilization method for atmospheric turbulence degradation video based on the Ritz pyramid. Background technique

[0002] The random transformation of meteorological parameters such as atmospheric temperature and humidity makes the atmospheric refractive index fluctuate randomly. When the light passes through the atmosphere whose refractive index fluctuates randomly, its direction of propagation will oscillate randomly, causing image blur and dynamic distortion in the imaging system. This degradation phenomenon is called optical turbulence effect. The optical turbulence effect reduces the imaging resolution, causes dynamic distortion of the imaging target, and affects the visual effect of the imaging system and target detection, tracking and recognition. How to eliminate the optical turbulence effect has always been a difficult problem in the...

Examples

Embodiment Construction

[0042] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0043] Such as figure 1 Shown, a kind of atmospheric turbulence degradation video fast stabilization method based on Ritz pyramid of the present invention is as follows:

[0044] Step 1: Image Pyramid Decomposition

[0045]Strong noise has an adverse effect on temporal filtering. The image pyramid is used to decompose the image into subbands with different spatial frequencies. The signal-to-noise ratio of image subbands with lower spatial frequencies is improved, reducing the impact of noise on temporal filtering. . Therefore, before performing Riesz transformation (Ries transformation), it is necessary to use pyramid decomposition for each frame of image to reduce the spatial frequency.

[0046] The Laplacian pyramid is a compact pyramid in the spatial domain that decomposes an image into a series of high-pass components and a low-pass componen...

technical field

[0001] The invention relates to the technical fields of optical imaging and digital images, in particular to a fast stabilization method for atmospheric turbulence degradation video based on the Ritz pyramid. Background technique

[0002] The random transformation of meteorological parameters such as atmospheric temperature and humidity makes the atmospheric refractive index fluctuate randomly. When the light passes through the atmosphere whose refractive index fluctuates randomly, its direction of propagation will oscillate randomly, causing image blur and dynamic distortion in the imaging system. This degradation phenomenon is called optical turbulence effect. The optical turbulence effect reduces the imaging resolution, causes dynamic distortion of the imaging target, and affects the visual effect of the imaging system and target detection, tracking and recognition. How to eliminate the optical turbulence effect has always been a difficult problem in the...

Examples

Embodiment Construction

[0042] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0043] Such as figure 1 Shown, a kind of atmospheric turbulence degradation video fast stabilization method based on Ritz pyramid of the present invention is as follows:

[0044] Step 1: Image Pyramid Decomposition

[0045]Strong noise has an adverse effect on temporal filtering. The image pyramid is used to decompose the image into subbands with different spatial frequencies. The signal-to-noise ratio of image subbands with lower spatial frequencies is improved, reducing the impact of noise on temporal filtering. . Therefore, before performing Riesz transformation (Ries transformation), it is necessary to use pyramid decomposition for each frame of image to reduce the spatial frequency.

[0046] The Laplacian pyramid is a compact pyramid in the spatial domain that decomposes an image into a series of high-pass components and a low-pass componen...

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