5,178 research outputs found
Keypoints-based deep feature fusion for cooperative vehicle detection of autonomous driving
Sharing collective perception messages (CPM) between vehicles is investigated
to decrease occlusions so as to improve the perception accuracy and safety of
autonomous driving. However, highly accurate data sharing and low communication
overhead is a big challenge for collective perception, especially when
real-time communication is required among connected and automated vehicles. In
this paper, we propose an efficient and effective keypoints-based deep feature
fusion framework built on the 3D object detector PV-RCNN, called Fusion PV-RCNN
(FPV-RCNN for short), for collective perception. We introduce a
high-performance bounding box proposal matching module and a keypoints
selection strategy to compress the CPM size and solve the multi-vehicle data
fusion problem. Besides, we also propose an effective localization error
correction module based on the maximum consensus principle to increase the
robustness of the data fusion. Compared to a bird's-eye view (BEV) keypoints
feature fusion, FPV-RCNN achieves improved detection accuracy by about 9% at a
high evaluation criterion (IoU 0.7) on the synthetic dataset COMAP dedicated to
collective perception. In addition, its performance is comparable to two raw
data fusion baselines that have no data loss in sharing. Moreover, our method
also significantly decreases the CPM size to less than 0.3 KB, and is thus
about 50 times smaller than the BEV feature map sharing used in previous works.
Even with further decreased CPM feature channels, i.e., from 128 to 32, the
detection performance does not show apparent drops. The code of our method is
available at https://github.com/YuanYunshuang/FPV_RCNN
Effects of bleaching agents on dental restorative materials: A review of the literature and recommendation to dental practitioners and researchers
AbstractIn recent years, there has been an increased demand for improvement in the appearance of natural teeth. The conservative technique of tooth bleaching has gained attention and acceptance from both patients and clinicians. Despite increased popularity, there is controversy surrounding the adverse effects of bleaching on dental restorative materials. This article reviews the effects of bleaching agents on major categories of dental restorative materials and provides evidence-based recommendations to the clinicians and researchers. Current literature reveal that bleaching might have a detrimental effect on restorative materials. However, because of the variability in experimental design, there is a lack of consensus concerning the bleaching effects on restorative materials. A standardized and reproducible guideline for assessment of bleaching effects on restorative materials needs to be established and verified by future studies
- …