access icon free Image denoising using 2D orthogonal locality preserving discriminant projection

Image denoising using a combination of non-local self-similarity and transformed domain techniques has become popular in past few years. Instead of working on independent pixels, patches extracted from the noisy image are grouped together based on structural similarity and noise elimination is performed in transformed domain. Orthogonal locality preserving projection and its variant that processes the images directly in matrix format have been used for image denoising recently. Locality preserving nature of these techniques takes care of similarity within image patches while learning the basis, hence reducing the task of grouping patches explicitly. Non-local self-similarity based image denoising approaches perform patch grouping based on structural similarity. Discriminant information, if considered can play pivotal role in achieving superior clustering of data and thereby is expected to enhance the quality of denoising. With this aim in mind, two-dimensional (2D) orthogonal locality preserving discriminant projection is formulated in this study. While learning the basis, along with the similarity, proposed approach also takes into account dissimilarity between patches. A global basis thus learnt from the noisy image is used for denoising and comparable denoising performance is shown relative to the state-of-the-art methods.

Inspec keywords: learning (artificial intelligence); transforms; pattern clustering; image denoising

Other keywords: structural similarity; noisy image; comparable denoising performance; orthogonal locality preserving projection; denoising denoising performance; transformed domain; two-dimensional orthogonal locality; domain techniques; 2D orthogonal locality; nonlocal self-similarity based image denoising approaches; locality preserving nature; image patches; discriminant projection

Subjects: Knowledge engineering techniques; Computer vision and image processing techniques; Optical, image and video signal processing

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-ipr.2019.0436
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content/journals/10.1049/iet-ipr.2019.0436
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