Abstract
Progress in scene understanding requires reasoning about the rich and diverse visual environments that make up our daily experience. To this end, we propose the Scene Understanding database, a nearly exhaustive collection of scenes categorized at the same level of specificity as human discourse. The database contains 908 distinct scene categories and 131,072 images. Given this data with both scene and object labels available, we perform in-depth analysis of co-occurrence statistics and the contextual relationship. To better understand this large scale taxonomy of scene categories, we perform two human experiments: we quantify human scene recognition accuracy, and we measure how typical each image is of its assigned scene category. Next, we perform computational experiments: scene recognition with global image features, indoor versus outdoor classification, and “scene detection,” in which we relax the assumption that one image depicts only one scene category. Finally, we relate human experiments to machine performance and explore the relationship between human and machine recognition errors and the relationship between image “typicality” and machine recognition accuracy.
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All the images and scene definitions are available at sundatabase.mit.edu or sun.cs.princeton.edu.
This difference also explains why our count is much higher than (Biederman 1987) estimate of about 1,000 basic-level objects – we included all object words in our count, not just basic-level terms.
The number of images is continuously growing as we run our scripts to query more images from time to time.
Category size ranged from 22 images in the smallest categories to 2360 in the largest. A total of 124,901 images were used in the experiment.
All workers were located in the United States and had a good performance record with the service (at least 100 HITs completed with an acceptance rate of 95 % or better). Workers were paid $0.03 per trial.
Note that we use color for dense SIFT computation and train the feature codebook using SUN database that contains color images only. The 15-scene dataset from Lazebnik et al. (2006) contains several categories of grayscale images, which do not have color information. Therefore, the result of our color-based dense SIFT on the 15-scene database (see Fig. 19a) is much worse than what is reported in Lazebnik et al. (2006).
\(F(3,19846) = 278, p < .001\).
Due to the difficulty of the one-versus-all classification task, confidence was low across all classifications, and even correctly-classified images had average confidence scores below zero.
A \(4 \times 2\) ANOVA gives significant main effects of image typicality (\(F(3,19842) = 79.8, p < .001\)) and correct vs. incorrect classification (\(F(1,19842) = 6006, p < .001\)) and a significant interaction between these factors (\(F(3,19842) = 43.5, p < .001\)).
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Acknowledgments
We thank Yinda Zhang for help on the scene classification experiments. This work is funded by Google Research Award to J. X., NSF Grant 1016862 to A.O, NSF CAREER Award 0747120 to A.T., NSF CAREER Award 1149853 to J.H, as well as ONR MURI N000141010933, Foxconn and gifts from Microsoft and Google. K.A.E was funded by a NSF Graduate Research fellowship.
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Xiao, J., Ehinger, K.A., Hays, J. et al. SUN Database: Exploring a Large Collection of Scene Categories. Int J Comput Vis 119, 3–22 (2016). https://doi.org/10.1007/s11263-014-0748-y
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DOI: https://doi.org/10.1007/s11263-014-0748-y