Image understanding using sparse representations

Jayaraman J. Thiagarajan, Karthikeyan Natesan Ramamurthy, Pavan Turaga, Andreas Spanias

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Download Free Sample Image understanding has been playing an increasingly crucial role in several inverse problems and computer vision. Sparse models form an important component in image understanding, since they emulate the activity of neural receptors in the primary visual cortex of the human brain. Sparse methods have been utilized in several learning problems because of their ability to provide parsimonious, interpretable, and efficient models. Exploiting the sparsity of natural signals has led to advances in several application areas including image compression, denoising, inpainting, compressed sensing, blind source separation, super-resolution, and classification. The primary goal of this book is to present the theory and algorithmic considerations in using sparse models for image understanding and computer vision applications. To this end, algorithms for obtaining sparse representations and their performance guarantees are discussed in the initial chapters. Furthermore, approaches for designing overcomplete, data-adapted dictionaries to model natural images are described. The development of theory behind dictionary learning involves exploring its connection to unsupervised clustering and analyzing its generalization characteristics using principles from statistical learning theory. An exciting application area that has benefited extensively from the theory of sparse representations is compressed sensing of image and video data. Theory and algorithms pertinent to measurement design, recovery, and model-based compressed sensing are presented. The paradigm of sparse models, when suitably integrated with powerful machine learning frameworks, can lead to advances in computer vision applications such as object recognition, clustering, segmentation, and activity recognition. Frameworks that enhance the performance of sparse models in such applications by imposing constraints based on the prior discriminatory information and the underlying geometrical structure, and kernelizing the sparse coding and dictionary learning methods are presented. In addition to presenting theoretical fundamentals in sparse learning, this book provides a platform for interested readers to explore the vastly growing application domains of sparse representations.

Original languageEnglish (US)
Pages (from-to)1-120
Number of pages120
JournalSynthesis Lectures on Image, Video, and Multimedia Processing
Volume15
DOIs
Publication statusPublished - Apr 24 2014

    Fingerprint

Keywords

  • Clustering
  • Compressed sensing
  • Dictionary learning
  • Graph embedding
  • Image classification
  • Image reconstruction
  • Image recovery
  • Kernel methods
  • Natural images
  • Sparse representations

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Signal Processing
  • Computer Graphics and Computer-Aided Design
  • Atomic and Molecular Physics, and Optics

Cite this