Papers › Multimodal Object Detection via Probabilistic Ensembling

Multimodal Object Detection via Probabilistic Ensembling

7 Apr 2021arXiv:2104.02904archive 2025-07-28

Yi-Ting Chen, Jinghao Shi, Zelin Ye, Christoph Mertz, Deva Ramanan, Shu Kong

Object detection with multimodal inputs can improve many safety-critical systems such as autonomous vehicles (AVs). Motivated by AVs that operate in both day and night, we study multimodal object detection with RGB and thermal cameras, since the latter provides much stronger object signatures under poor illumination. We explore strategies for fusing information from different modalities. Our key contribution is a probabilistic ensembling technique, ProbEn, a simple non-learned method that fuses together detections from multi-modalities. We derive ProbEn from Bayes' rule and first principles that assume conditional independence across modalities. Through probabilistic marginalization, ProbEn elegantly handles missing modalities when detectors do not fire on the same object. Importantly, ProbEn also notably improves multimodal detection even when the conditional independence assumption does not hold, e.g., fusing outputs from other fusion methods (both off-the-shelf and trained in-house). We validate ProbEn on two benchmarks containing both aligned (KAIST) and unaligned (FLIR) multimodal images, showing that ProbEn outperforms prior work by more than 13% in relative performance!

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Tasks

3D Object DetectionAutonomous VehiclesObjectObject DetectionPedestrian Detectionobject-detection

Results from the paper archive 2025-07-28

TaskDatasetModelMetricValueRank at snapshotLeaderboardReport
Object Detection EventPed ProEN AP 60.1 #3 of 6 Archive leaderboard report
Object Detection InOutDoor ProbEN AP 62.4 #2 of 6 Archive leaderboard report
Object Detection STCrowd ProbEN AP 60.0 #4 of 6 Archive leaderboard report
Pedestrian Detection LLVIP ProbEn AP 0.515 #13 of 15 Archive leaderboard report

Ranks are positions in the archive's leaderboards as they stood at the 2025-07-28 snapshot. Results published since then are not among these rows, so a rank here is not a current standing.

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