Restraining method on edge Halo effects during process of resetting projections onto convex sets (POCS) super-resolution image

A low-resolution image and image reconstruction technology, which is applied in the field of image processing and can solve problems such as low resolution, edge Halo effect, and edge blurring.

Active Publication Date: 2013-06-05
南京多目智能科技有限公司
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  • Abstract
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Problems solved by technology

[0005] In view of this, the present invention provides a method for suppressing the edge Halo effect in POCS super-resolution image reconstruction, to solve image quality problems such as edge blurring, edge Halo effect, and low resolution in the POCS method

Method used

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  • Restraining method on edge Halo effects during process of resetting projections onto convex sets (POCS) super-resolution image
  • Restraining method on edge Halo effects during process of resetting projections onto convex sets (POCS) super-resolution image
  • Restraining method on edge Halo effects during process of resetting projections onto convex sets (POCS) super-resolution image

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Embodiment 1

[0101] see Figure 5 The flow of the method for suppressing the edge Halo effect during POCS super-resolution image reconstruction disclosed in this embodiment includes the following steps:

[0102] Step S1, read the low-resolution image sequence g with overlapping parts in the same scene i , i is the serial number of the low-resolution image observation frame, i∈[1,n], n is the total number of low-resolution images, n∈[6,36], the resolution is M×N, M∈[64,256], N ∈ [64,256].

[0103] Step S2, select one frame from n frames of low-resolution images as the low-resolution reference frame g 0 , for g 0 Perform wavelet bicubic interpolation to obtain a high-resolution initial estimate f of qM×qN 0 (x, y), q represents the multiple of resolution improvement, q∈[2,4], and (x,) y represents the coordinate point.

[0104] The POCS algorithm is to project the high-resolution estimated value generated by each iteration into the next convex constraint set, so the quality of the high-...

Embodiment 2

[0172] The above embodiments describe the method disclosed in the present invention in detail theoretically, and describe its beneficial effects theoretically. In the following, this embodiment will start from the actual processing process, compare the results of reconstructing images of different scenes between the present invention and the prior art, and support the present invention from practical applications.

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Abstract

The invention discloses a restraining method on edge Halo effects during the process of resetting a projections onto convex sets (POCS) super-resolution image, and belongs to the technical field of image processing techniques. The restraining method on the edge Halo effects during the process of resetting the POCS super-resolution image comprises a step of reading the sequence of a low-resolution image, a step of acquiring a high-resolution initial estimated value of convex sets by applying of a wavelet bicubic interpolation, a step of carrying out motion estimation to achieve low-resolution image registration by applying of a pre-filtering sub pixel iteration method, a step of determining a point spread function with edge-preserving characteristics by comprehensively considering space position information and grey information restraint of high-resolution estimation image pixels, a step of determining a length-variable loose projection parameter value according to relevance between all low-resolution observation frames and reference frames, and a step of resetting super-resolution by applying of a POCS method and combining of the high-resolution initial estimated value, the point spread function with the edge-preserving characteristics and the length-variable loose projection parameter value. Therefore, the image space resolution is improved and the ideal high-resolution image is obtained. By means of the restraining method, the edge Halo effects in the reset image can be reduced to a very large extent.

Description

technical field [0001] The invention belongs to the field of image processing, and more specifically relates to a method for suppressing edge Halo effects during POCS super-resolution image reconstruction. Background technique [0002] With the rapid development of the information age, high-resolution images have been more and more widely used. However, due to constraints such as the cost of physical equipment and various imaging environments, the quality of images obtained by people is low and the resolution is not high. To this end, some scholars have proposed super-resolution reconstruction technology. Its purpose is to make up for the lack of hardware, improve the spatial resolution of the image from the perspective of software, and enhance the usability of the image. Super-resolution technology has a wide range of applications. For example: in the field of military reconnaissance, in order to improve the positioning, identification and early warning capabilities of m...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T7/00
Inventor 郗慧琴肖创柏段娟刘毅
Owner 南京多目智能科技有限公司
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