期刊
IEEE TRANSACTIONS ON CYBERNETICS
卷 48, 期 5, 页码 1474-1485出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCYB.2017.2703134
关键词
Color image processing; face hallucination; image super-resolution; locality-constrained coding (LCC); quaternion algebra
类别
资金
- Fundamental Research Funds for the Central Universities [531107050878]
- National Natural Science Fund of China for Distinguished Young Scholars [61325007]
- National Natural Science Fund of China for International Cooperation and Exchanges [61520106001]
- National Natural Science Foundation of China [61572540]
- Macau Science and Technology Development Fund [FDCT/019/2015/A]
Recently, the locality linear coding (LLC) has attracted more and more attentions in the areas of image processing and computer vision. However, the conventional LLC with real setting is just designed for the grayscale image. For the color image, it usually treats each color channel individually or encodes the monochrome image by concatenating all the color channels, which ignores the correlations among different channels. In this paper, we propose a quaternion-based locality-constrained coding (QLC) model for color face hallucination in the quaternion space. In QLC, the face images are represented as quaternion matrices. By transforming the channel images into an orthogonal feature space and encoding the coefficients in the quaternion domain, the proposed QLC is expected to learn the advantages of both quaternion algebra and locality coding scheme. Hence, the QLC cannot only expose the true topology of image patch manifold but also preserve the inherent correlations among different color channels. Experimental results demonstrated that our proposed QLC method achieved superior performance in color face hallucination compared with other state-of-the-art methods.
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