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Image sub-nyquist sampling method based on compressed sensing

A compressed sensing and image technology, applied in the field of image processing, to achieve the effect of easy hardware implementation

Active Publication Date: 2016-06-29
CHONGQING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is currently no specific method that can effectively implement sub-Nyquist sampling of two-dimensional image signals.

Method used

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  • Image sub-nyquist sampling method based on compressed sensing
  • Image sub-nyquist sampling method based on compressed sensing
  • Image sub-nyquist sampling method based on compressed sensing

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Embodiment Construction

[0033] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] Figure 7 Design a flowchart for the system, Figure 6 It is a schematic diagram of the system, as shown in the figure, the method of the present invention includes the following steps:

[0035] 1. Establish a signal model

[0036] In practice, the energy of most signals is not distributed on any frequency component within its entire bandwidth, but only concentrated on a limited or even a small number of sub-frequency bands. In order to effectively describe this structural information, and considering that the current relatively mature theoretical achievements on sampling and the realization of hardware equipment are all based on signal spectrum analysis, the present invention models the image signal as a two-dimensional multi-band signal model. The specific description is as follows:

[0037] Let the signal x(t 1 ,t 2 ) is a r...

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Abstract

The invention relates to an image sub-nyquist sampling method based on compressed sensing, belonging to the technical field of image processing. The method comprises the following steps of (1), establishing a two-dimensional multi-band image signal model according to the characteristic that most of energy in an image signal is distributed in limited, even few, sub-bands in a bandwidth range; (2), uniformly dividing an image signal spectrum, and selecting a generation function for each spectrum sub-block obtained by division, such that a translation invariant signal space capable of effectively representing the characteristic of the image signal is obtained; (3), establishing a space sampling scheme suitable for a signal in the translation invariant space; (4), improving the space sampling scheme in the step (3), and establishing a sub-nyquist sampling scheme suitable for the signal in the translation invariant space; and (5), establishing a corresponding reconstruction scheme, and reconstructing an original analog signal. By means of the invention, the challenges of high sampling rate and sampling data volume in the current image acquisition equipment can be effectively relieved.

Description

technical field [0001] The invention belongs to the technical field of image processing, and relates to an image sub-Nyquist sampling method based on compressed sensing. Background technique [0002] Image signals are highly intuitive and rich in information content, and have become an important source of human information acquisition and exchange. Digital image processing technology has been widely used in remote sensing aerospace, biomedicine, military public security, communication engineering and other fields due to its advantages of high processing precision, strong flexibility, and good stability. A prerequisite for digital image processing is the acquisition of discrete digital images. The existing digital image acquisition methods are to first sample the analog image at high speed according to the Nyquist sampling theorem, and then compress and code the collected massive data to remove redundancy and reduce the amount of data that needs to be transmitted or stored. ...

Claims

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Application Information

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IPC IPC(8): H04N19/132H04N19/136H04N19/117H04N19/176H04N19/149
CPCH04N19/117H04N19/132H04N19/136H04N19/149H04N19/176
Inventor 王汝言杜阳赵辉罗华丰李红兵赵小梅
Owner CHONGQING UNIV OF POSTS & TELECOMM