CONF Santani_ICMR-DSANTANI_2017/IDIAP Insiders and Outsiders: Comparing Urban Impressions between Population Groups Santani, Darshan Ruiz-Correa, Salvador Gatica-Perez, Daniel EXTERNAL http://publications.idiap.ch/attachments/papers/2017/Santani_ICMR-DSANTANI_2017.pdf PUBLIC International Conference on Multimedia Retrieval 2017 ACM http://dx.doi.org/10.1145/3078971.3079022 doi Urban Perception; Crowdsourcing; Mobile; Youth; Subjective Properties