| 1. |
- Berg, Amanda, 1988-, et al.
(författare)
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Channel Coded Distribution Field Tracking for Thermal Infrared Imagery
- 2016
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Ingår i: PROCEEDINGS OF 29TH IEEE CONFERENCE ON COMPUTER VISION AND PATTERN RECOGNITION WORKSHOPS, (CVPRW 2016). - : IEEE. - 9781509014385 - 9781509014378 ; , s. 1248-1256
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Konferensbidrag (refereegranskat)abstract
- We address short-term, single-object tracking, a topic that is currently seeing fast progress for visual video, for the case of thermal infrared (TIR) imagery. The fast progress has been possible thanks to the development of new template-based tracking methods with online template updates, methods which have not been explored for TIR tracking. Instead, tracking methods used for TIR are often subject to a number of constraints, e.g., warm objects, low spatial resolution, and static camera. As TIR cameras become less noisy and get higher resolution these constraints are less relevant, and for emerging civilian applications, e.g., surveillance and automotive safety, new tracking methods are needed. Due to the special characteristics of TIR imagery, we argue that template-based trackers based on distribution fields should have an advantage over trackers based on spatial structure features. In this paper, we propose a template-based tracking method (ABCD) designed specifically for TIR and not being restricted by any of the constraints above. In order to avoid background contamination of the object template, we propose to exploit background information for the online template update and to adaptively select the object region used for tracking. Moreover, we propose a novel method for estimating object scale change. The proposed tracker is evaluated on the VOT-TIR2015 and VOT2015 datasets using the VOT evaluation toolkit and a comparison of relative ranking of all common participating trackers in the challenges is provided. Further, the proposed tracker, ABCD, and the VOT-TIR2015 winner SRDCFir are evaluated on maritime data. Experimental results show that the ABCD tracker performs particularly well on thermal infrared sequences.
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| 2. |
- Bigun, Josef, 1961-, et al.
(författare)
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Frequency map by Structure Tensor in Logarithmic Scale Space and Forensic Fingerprints
- 2016
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Ingår i: PROCEEDINGS OF 29TH IEEE CONFERENCE ON COMPUTER VISION AND PATTERN RECOGNITION WORKSHOPS, (CVPRW 2016). - Piscataway, NJ : IEEE. - 9781509014378 ; , s. 204-213
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Konferensbidrag (refereegranskat)abstract
- Increasingly, absolute frequency and orientation maps are needed, e.g. for forensics. We introduce a non-linear scale space via the logarithm of trace of the Structure Tensor. Therein, frequency estimation becomes an orientation estimation problem. We show that this offers significant advantages, including construction of efficient isotropic estimations of dense maps of frequency. In fingerprints, both maps are shown to improve each other in an enhancement scheme via Gabor filtering. We suggest a novel continuous ridge counting method, relying only on dense absolute frequency and orientation maps, without ridge detection, thinning, etc. Furthermore, we present new evidence that frequency maps are useful attributes of minutiae. We verify that the suggested method compares favorably with state of the art using forensic fingerprints as test bed, and test images where the ground truth is known. In evaluations, we use public data sets and published methods only.
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| 3. |
- Jones, Andrew, et al.
(författare)
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Time-Offset Conversations on a Life-Sized Automultiscopic Projector Array
- 2016
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Ingår i: PROCEEDINGS OF 29TH IEEE CONFERENCE ON COMPUTER VISION AND PATTERN RECOGNITION WORKSHOPS, (CVPRW 2016). - : IEEE. - 9781509014378 ; , s. 927-935
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Konferensbidrag (refereegranskat)abstract
- We present a system for creating and displaying interactive life-sized 3D digital humans based on pre-recorded interviews. We use 30 cameras and an extensive list of questions to record a large set of video responses. Users access videos through a natural conversation interface that mimics face-to-face interaction. Recordings of answers, listening and idle behaviors are linked together to create a persistent visual image of the person throughout the interaction. The interview subjects are rendered using flowed light fields and shown life-size on a special rear-projection screen with an array of 216 video projectors. The display allows multiple users to see different 3D perspectives of the subject in proper relation to their viewpoints, without the need for stereo glasses. The display is effective for interactive conversations since it provides 3D cues such as eye gaze and spatial hand gestures.
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