Nazir, SaimaYousaf, Muhammad HaroonVelastin Carroza, Sergio Alejandro2019-10-012019-10-012017-11-20Nazir, S., Yousaf, M.H. y Velastin, S.A. (2018). Feature Similarity and Frequency-Based Weighted Visual Words Codebook Learning Scheme for Human Action Recognition. In PSIVT 2017 Image and Video Technology,10749, pp. 326-336.978-3-319-75786-5https://hdl.handle.net/10016/28933This paper has been presented at : 8th Pacific-Rim Symposium, PSIVT 2017.Human action recognition has become a popular field for computer vision researchers in the recent decade. This paper presents a human action recognition scheme based on a textual information concept inspired by document retrieval systems. Videos are represented using a commonly used local feature representation. In addition, we formulate a new weighted class specific dictionary learning scheme to reflect the importance of visual words for a particular action class. Weighted class specific dictionary learning enriches the scheme to learn a sparse representation for a particular action class. To evaluate our scheme on realistic and complex scenarios, we have tested it on UCF Sports and UCF11 benchmark datasets. This paper reports experimental results that outperform recent state-of-the-art methods for the UCF Sports and the UCF11 dataset i.e. 98.93% and 93.88% in terms of average accuracy respectively. To the best of our knowledge, this contribution is first to apply a weighted class specific dictionary learning method on realistic human action recognition datasets.11eng© Springer International Publishing AG, part of Springer Nature 2018Human action recognitionBag of visual wordsSpatio-temporal featuresUcf sportsconference paperInformáticaopen access326336Image and Video Technology PSIVT 201710749CC/0000029176