Next Article in Journal
Intelligent High-Resolution Geological Mapping Based on SLIC-CNN
Previous Article in Journal
Geospatial Data Management Research: Progress and Future Directions
Open AccessEditor’s ChoiceArticle

Towards Detecting Building Facades with Graffiti Artwork Based on Street View Images

1
Institute of Geography, Heidelberg University, 69117 Heidelberg, Germany
2
Metropolregion Rhein-Neckar, 68161 Mannheim, Germany
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
ISPRS Int. J. Geo-Inf. 2020, 9(2), 98; https://doi.org/10.3390/ijgi9020098
Received: 29 November 2019 / Revised: 16 January 2020 / Accepted: 27 January 2020 / Published: 4 February 2020
As a recognized type of art, graffiti is a cultural asset and an important aspect of a city’s aesthetics. As such, graffiti is associated with social and commercial vibrancy and is known to attract tourists. However, positional uncertainty and incompleteness are current issues of open geo-datasets containing graffiti data. In this paper, we present an approach towards detecting building facades with graffiti artwork based on the automatic interpretation of images from Google Street View (GSV). It starts with the identification of geo-tagged photos of graffiti artwork posted on the photo sharing media Flickr. GSV images are then extracted from the surroundings of these photos and interpreted by a customized, i.e., transfer learned, convolutional neural network. The compass heading of the GSV images classified as containing graffiti artwork and the possible positions of their acquisition are considered for scoring building facades according to their potential of containing the artwork observable in the GSV images. More than 36,000 GSV images and 5000 facades from buildings represented in OpenStreetMap were processed and evaluated. Precision and recall rates were computed for different facade score thresholds. False-positive errors are caused mostly by advertisements and scribblings on the building facades as well as by movable objects containing graffiti artwork and obstructing the facades. However, considering higher scores as threshold for detecting facades containing graffiti leads to the perfect precision rate. Our approach can be applied for identifying previously unmapped graffiti artwork and for assisting map contributors interested in the topic. Furthermore, researchers interested on the spatial correlations between graffiti artwork and socio-economic factors can profit from our open-access code and results. View Full-Text
Keywords: graffiti; street art; social media; street view; neural networks graffiti; street art; social media; street view; neural networks
Show Figures

Figure 1

MDPI and ACS Style

Novack, T.; Vorbeck, L.; Lorei, H.; Zipf, A. Towards Detecting Building Facades with Graffiti Artwork Based on Street View Images. ISPRS Int. J. Geo-Inf. 2020, 9, 98. https://doi.org/10.3390/ijgi9020098

AMA Style

Novack T, Vorbeck L, Lorei H, Zipf A. Towards Detecting Building Facades with Graffiti Artwork Based on Street View Images. ISPRS International Journal of Geo-Information. 2020; 9(2):98. https://doi.org/10.3390/ijgi9020098

Chicago/Turabian Style

Novack, Tessio; Vorbeck, Leonard; Lorei, Heinrich; Zipf, Alexander. 2020. "Towards Detecting Building Facades with Graffiti Artwork Based on Street View Images" ISPRS Int. J. Geo-Inf. 9, no. 2: 98. https://doi.org/10.3390/ijgi9020098

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop