Structure Inference Net: Object Detection Using Scene-Level Context and Instance-Level Relationships
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1 Structure Inference Net: Object Detection Using Scene-Level Context and Instance-Level Relationships Yong Liu,2, Ruiping Wang,2,3, Shiguang Shan,2,3, Xilin Chen,2,3 Key Laboratory of Intelligent Information Processing of Chinese Academy of Sciences (CAS), Institute of Computing Technology, CAS, Beijing, 9, China 2 University of Chinese Academy of Sciences, Beijing, 49, China 3 Cooperative Medianet Innovation Center, China yong.liu@vipl.ict.ac.cn, {wangruiping, sgshan, xlchen}@ict.ac.cn This document provides more quantitive results of localization, occlusion and area size, more qualitative results of relationships and more detection samples in the following sections, where the baseline method is Faster R-CNN.. Localization This section gives additional results of Sec. 5.2 (Localization part) in the main paper. The 2 categories in PASCAL VOC are divided into three super-categories including animals, vehicles and furnitures. Fig. takes these super-categories to show the frequency and impact on the performance of each type of false positive. One can see that Edge has fewer localization errors on vehicles compared with the baseline, and SIN performs best. 2. Occlusion & Area Size This section details the occlusion and area size analysis of SIN. We inspect the performance variations for each characteristic on seven categories selected by [] (i.e. Ref. [2] in the main paper) on PASCAL VOC 27. Here, results on three typical categories including boat, chair and dining table are presented in Fig. 2. We can learn that SIN performs better with occluded, truncated and small objects compared with the baseline. 3. Relationships Visualization This section gives more qualitative results of relationships produced by SIN to check whether the relative object-object relationship has really been learned on COCO in Fig. 3.
2 animals animals animals BG: 2% Oth: % Sim: % BG: 2% Oth: % Sim: % BG: % Oth: % Sim: % Cor: 79% Cor: 8% Cor: 8% (a) animals vehicles on baseline Sim: 5% Loc: % (b) vehicles animals on Edge Sim: 4% Loc: % (c) animals vehicles on SIN (Scene & Edge) Sim: 5% Loc: % Cor: 79% Cor: 8% Cor: 8% (d) furniture vehicles on baseline (e) furniture vehicles on Edge (f) vehicles furniture on SIN (Scene & Edge) Oth: 9% Sim: % Oth: 8% Sim: 9% Oth: 7% Sim: % Cor: 62% Loc: % Cor: 64% Loc: % Cor: 64% Loc: % (g) furnitures on baseline (h) furnitures on Edge (i) furnitures on SIN (Scene & Edge) Figure. Analysis of Top-Ranked False Positives. Pie charts: fraction of detections that are correct (Cor) or false positive due to poor localization (Loc), confusion with similar objects (Sim), confusion with other VOC objects (Oth), or confusion with background or unlabeled objects (BG). In every pair of results, the left is based on baseline, the middle is based on Edge and the right is based on SIN. Loc errors of our SIN method are fewer than the baseline. 4. Qualitative Results on VOC In this part, we present more qualitative results of SIN versus the baseline on VOC in Fig Qualitative Results on COCO In this part, we present more qualitative results of SIN versus the baseline on COCO in Fig. 5. References [] D. Hoiem, Y. Chodpathumwan, and Q. Dai. Diagnosing error in object detectors. In ECCV, 22. 2
3 Baseline: boat Trnc. BBox Area.93 Aspect Rat. Sides Visible AllGRU: boat.99 Trnc. BBox Area Aspect Rat. Sides Visible.2 bttm front rear N T XSS M LXL XTT MWXW. body cabin mast pddl sail wndw N T XSS M LXL XTT MWXW bttm front rear. body cabin mast pddl sail wndw (a) boat Baseline: chair Trnc. BBox Area AllGRU: chair Aspect Rat. Sides Visible Trnc. BBox Area Aspect Rat. Sides Visible.2.7 NT XSS M L XL XTT M WXW bttm front rear bckrst cshn hndrst leg NT XSS M L XL XTT M WXW.92 Trnc. bttm front rear bckrst cshn hndrst leg (b) chair Baseline: diningtable Trnc. BBox Area AllGRU: diningtable Aspect Rat. Sides Visible Sides Visible N L M H Aspect Rat BBox Area N T XS S M L XL XT T M W XW tbllg tbltp.6 N L M H N T XS S M L XL XT T M W XW tbllg tbltp (c) dining table Figure 2. Per-Category Analysis of Characteristics. APN (+) with standard error bars (red). Black dashed lines indicate overall APN. Key: Occlusion: N=none; L=low; M=medium; H=high. Truncation: N=not truncated; T=truncated. Box Area: XS=extra-small; S=small; M=medium; L=large; XL=extra-large. Aspect Ratio: XT=extra-tall/narrow; T=tall; M=medium; W=wide; XW=extra-wide. Part Visibility / Viewpoint: =part/ is visible; =part/ is not visible. In every pair of results, the left is based on baseline, and the right is detection result of SIN. We can learn that SIN performs better with occluded, truncated and small objects compared with the baseline. Figure 3. More Relative Objects Visualization on COCO. It is learned that those objects connected by red dashed line are most relative. 3
4 Figure 4. More Qualitative results of Baseline vs. SIN on VOC. In every pair of detection results, the left is based on baseline, and the right is detection result of SIN. We can see that SIN always performs better. 4
5 Figure 5. More Qualitative results of Baseline vs. SIN on COCO. In every pair of detection results, the left is based on baseline, and the right is detection result of SIN. We can see that SIN always performs better. 5
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