Image super-resolution method

A super-resolution and image technology, applied in the field of image super-resolution, can solve problems such as slow processing speed

Active Publication Date: 2015-09-09
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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However, such methods usually need to solve optimization problems

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[0039] The embodiments of the present invention will be described in detail below. It should be emphasized that the following description is only exemplary, and is not intended to limit the scope of the present invention and its application.

[0040] Refer to figure 1 In the embodiment of the present invention, for a single low-resolution image, an image super-resolution method based on non-correlated dictionary learning and nearest neighbor regression is proposed. According to this method, a training sample set is extracted from the existing high-quality images, and a low-resolution dictionary is trained on the training samples. From the base of the low-resolution dictionary and the high- and low-resolution samples, the high- and low-resolution neighbor sets corresponding to each dictionary base are obtained, and then the mapping matrix from low-resolution features to high-resolution features is calculated, which is Training stage; for the input low-resolution image, extract ...

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Abstract

The present invention discloses an image super-resolution method. The method comprises: training a low-resolution dictionary DL; calculating high and low resolution neighbor sets {NH} and {NL}; calculating a mapping matrix set {Fi} from low resolution features to high resolution features; extracting a low-resolution image block set {PL} and a low-resolution feature set {yL} for input low-resolution image IL; selecting the most approximate dictionary-based dk from the low-resolution dictionary DL for each low-resolution feature yL, and utilizing a corresponding mapping matrix set Fk to recover matching high resolution features yH; adding all reconstructed high resolution features {yH} to the matching low-resolution image blocks {PL} to obtain the corresponding high-resolution image blocks {PH}, and fusing all the high-resolution image blocks into one high-resolution image IH. According to the method provided by the invention, the processing speed is high, and high-resolution images of high quality can be obtained.

Description

technical field [0001] The invention relates to the fields of computer vision and image processing, in particular to an image super-resolution method. Background technique [0002] Image super-resolution belongs to the field of computer vision and image processing. It is a classic image processing problem and has important academic and industrial research value. The goal of image super-resolution is to reconstruct its corresponding high-resolution image from a given low-resolution image, so that the visual effect is as good as possible while the reconstruction error is as small as possible. The current mainstream image super-resolution methods can be divided into three categories: methods based on interpolation; methods based on reconstruction; methods based on learning. [0003] Interpolation-based methods are a basic class of super-resolution methods, and their processing usually uses local covariance coefficients, fixed-function kernels or adaptive structure kernels, whi...

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Application Information

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IPC IPC(8): G06T3/40
CPCG06T3/4053
Inventor 张永兵张宇伦王兴政王好谦戴琼海
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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