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A face image super-resolution restoration method based on hr-lle weight constraints

A face image and super-resolution technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as error and non-isometricity, and achieve good image restoration results

Inactive Publication Date: 2016-10-05
山东网源信息技术有限公司
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Problems solved by technology

However, since the mapping from LR to HR space is a one-to-many mapping relationship, there is non-isometry in this mapping
Directly replacing the HR space weights with the weights of the LR space will introduce errors

Method used

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  • A face image super-resolution restoration method based on hr-lle weight constraints
  • A face image super-resolution restoration method based on hr-lle weight constraints
  • A face image super-resolution restoration method based on hr-lle weight constraints

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Embodiment Construction

[0031] The implementation examples of the present invention will be described below in conjunction with the accompanying drawings.

[0032] (1) Global HR-LLE weight constraint reconstruction

[0033] (1) Global average reconstruction weight constraints

[0034] First, two face image sample libraries need to be established, namely, the paired HR face image sample library and the corresponding LR face image sample library. In this invention, the CAS-PEAL face image library and the self-built second-generation ID card image library were selected for experiments; a total of 1470 frontal face images were selected, and they were all normalized to 140×160 pixel size as the sample library. HR face samples; downsample HR face samples by 4 times to generate corresponding LR face samples.

[0035] Using the traditional LLE-based weight solution method to calculate each LR face sample relative to its K 1 The reconstruction weight of the nearest neighbor sample, as shown in formula (1)....

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Abstract

The invention belongs to the filed of digital image processing and particularly relates to an HR (restrict restriction)-LLE (locally linear embedding) weight constraint based face image super-resolution restoration method. The restoration method includes: calculating a great many of HR face samples and average restoration weight constraint, relative to neighboring samples, of residual HR faces; during restoration, subjecting traditional LLE based face super-resolution restoration weight calculation method to weight constraint. The restoration method includes overall restoration and local detail compensation. The overall restoration aims to restore basic characteristics of a standard face as required, and the local detail compensation aims to restore the face image so as to enable the face to be provided with personality characteristics different from other faces. The HR-LLE weight constraint is added in the method in estimating the LLE based restoration weight of the target HR image, so that the weight is closer to the true restoration weight of the HR image in 12 norms. By the method, better image restoration results can be acquired.

Description

technical field [0001] The invention belongs to the field of digital image processing, in particular to a human face image super-resolution restoration method based on HR-LLE weight constraints. Background technique [0002] In recent years, technologies such as face detection and recognition have played an increasingly important role in multimedia applications such as video surveillance, mobile terminals, and network retrieval. The quality of face images has a great influence on the performance of these multimedia applications. However, due to the influence of image acquisition equipment and acquisition environment, especially in uncontrollable natural environments, the quality of acquired face images is usually poor, and it is difficult to be directly applied to subsequent detection and recognition. It is particularly important to use Super Resolution (SR) technology to improve the quality of face images after face image collection. [0003] Existing face super-resolutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 李晓光魏振利卓力
Owner 山东网源信息技术有限公司
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