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Inf. Syst."],"published-print":{"date-parts":[[2020,7,31]]},"abstract":"<jats:p>Opinion mining in outdoor images posted by users during different activities can provide valuable information to better understand urban areas. In this regard, we propose a framework to classify the sentiment of outdoor images shared by users on social networks. We compare the performance of state-of-the-art ConvNet architectures and one specifically designed for sentiment analysis. We also evaluate how the merging of deep features and semantic information derived from the scene attributes can improve classification and cross-dataset generalization performance. The evaluation explores a novel dataset\u2014namely, OutdoorSent\u2014and other publicly available datasets. We observe that the incorporation of knowledge about semantic attributes improves the accuracy of all ConvNet architectures studied. Besides, we found that exploring only images related to the context of the study\u2014outdoor, in our case\u2014is recommended, i.e., indoor images were not significantly helpful. Furthermore, we demonstrated the applicability of our results in the United States city of Chicago, Illinois, showing that they can help to improve the knowledge of subjective characteristics of different areas of the city. For instance, particular areas of the city tend to concentrate more images of a specific class of sentiment, which are also correlated with median income, opening up opportunities in different fields.<\/jats:p>","DOI":"10.1145\/3385186","type":"journal-article","created":{"date-parts":[[2020,5,4]],"date-time":"2020-05-04T09:57:41Z","timestamp":1588586261000},"page":"1-28","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":15,"title":["OutdoorSent"],"prefix":"10.1145","volume":"38","author":[{"given":"Wyverson Bonasoli de","family":"Oliveira","sequence":"first","affiliation":[{"name":"Universidade Tecnol\u00f3gica Federal do Paran\u00e1 - UTFPR, Curitiba, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Leyza Baldo","family":"Dorini","sequence":"additional","affiliation":[{"name":"Universidade Tecnol\u00f3gica Federal do Paran\u00e1 - UTFPR, Curitiba, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rodrigo","family":"Minetto","sequence":"additional","affiliation":[{"name":"Universidade Tecnol\u00f3gica Federal do Paran\u00e1 - UTFPR, Curitiba, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thiago H.","family":"Silva","sequence":"additional","affiliation":[{"name":"University of Toronto, Toronto, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2020,4,21]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1109\/IJCNN.2017.7966013"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.eswa.2017.02.002"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1145\/2950050"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1145\/2820426.2820642"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1145\/2502081.2502282"},{"key":"e_1_2_1_6_1","volume-title":"Natural Language Processing and Chinese Computing","author":"Cai Guoyong","unstructured":"Guoyong Cai and Binbin Xia . 2015. 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