针对像素层自适应分割算法(Pixel Based Adaptive Segmenter,PBAS)在动态背景下检测准确率低、静止或运动缓慢的前景目标被更新为背景以及出现鬼影干扰的问题,提出了一种结合像素级信息和区域级信息的改进的前景检测算法。首先,提出一...针对像素层自适应分割算法(Pixel Based Adaptive Segmenter,PBAS)在动态背景下检测准确率低、静止或运动缓慢的前景目标被更新为背景以及出现鬼影干扰的问题,提出了一种结合像素级信息和区域级信息的改进的前景检测算法。首先,提出一种融合区域结构信息和区域颜色信息的背景复杂度衡量方式;然后,采用改进的背景复杂度来控制判定阈值和学习率,并检测前景;其次,对像素层的检测结果使用区域窗口进行空间邻域对比,以消除鬼影;最后,引入前景计数机制来保证静止前景不被更新为背景。实验结果表明,该算法对光照条件和前景运动速度不敏感,能有效地从背景中检测出完整的前景目标,并迅速地消除鬼影干扰,准确率达到了92.7%。展开更多
The oxygen evolution reaction(OER),a critical half-reaction in water electrolysis,has garnered significant attention.However,sluggish OER kinetics has emerged as a major impediment to efficient electrochemical energy c...The oxygen evolution reaction(OER),a critical half-reaction in water electrolysis,has garnered significant attention.However,sluggish OER kinetics has emerged as a major impediment to efficient electrochemical energy conversion.There is an urgent need to design novel electrocatalysts with optimized OER kinetics and enhanced intrinsic activity to improve overall OER performance.Herein,one-dimensional(1D)nanocomposites with high electrocatalytic activity were developed through the deposition of CoFePBA nanocubes onto the surface of MnO_(2) nanowires.The electronic structure of the nanocomposite surface was modified,and the synergistic effects between transition metals were leveraged to enhance catalytic activity through the deposition of Prussian blue analog(PBA)nanocubes on manganese dioxide nanowires.Specifically,CoFePBA featured an open crystal structure that offiered numerous electrochemical active sites and efficient charge transfer pathways.Additionally,the synergistic interactions between Co and Fe significantly reduced the OER overpotential.Additionally,the 1D rigid MnO_(2) acted as protective armor,ensuring the stability of active sites within CoFePBA during the OER.The synthesized MnO_(2)@CoFePBA achieved an overpotential of 1.614 V at 10 mA/cm^(2) and a small Tafel slope of 94 mV/dec and demonstrated stable performance for over 200 h.This work offers new insights into the rational design of various PBA-based nanocomposites with high activity and stability.展开更多
文摘针对像素层自适应分割算法(Pixel Based Adaptive Segmenter,PBAS)在动态背景下检测准确率低、静止或运动缓慢的前景目标被更新为背景以及出现鬼影干扰的问题,提出了一种结合像素级信息和区域级信息的改进的前景检测算法。首先,提出一种融合区域结构信息和区域颜色信息的背景复杂度衡量方式;然后,采用改进的背景复杂度来控制判定阈值和学习率,并检测前景;其次,对像素层的检测结果使用区域窗口进行空间邻域对比,以消除鬼影;最后,引入前景计数机制来保证静止前景不被更新为背景。实验结果表明,该算法对光照条件和前景运动速度不敏感,能有效地从背景中检测出完整的前景目标,并迅速地消除鬼影干扰,准确率达到了92.7%。
基金supported by the National Natural Science Foundation of China(No.52371240)the Priority Academic Program Development of Jiangsu Higher Education Institutions.
文摘The oxygen evolution reaction(OER),a critical half-reaction in water electrolysis,has garnered significant attention.However,sluggish OER kinetics has emerged as a major impediment to efficient electrochemical energy conversion.There is an urgent need to design novel electrocatalysts with optimized OER kinetics and enhanced intrinsic activity to improve overall OER performance.Herein,one-dimensional(1D)nanocomposites with high electrocatalytic activity were developed through the deposition of CoFePBA nanocubes onto the surface of MnO_(2) nanowires.The electronic structure of the nanocomposite surface was modified,and the synergistic effects between transition metals were leveraged to enhance catalytic activity through the deposition of Prussian blue analog(PBA)nanocubes on manganese dioxide nanowires.Specifically,CoFePBA featured an open crystal structure that offiered numerous electrochemical active sites and efficient charge transfer pathways.Additionally,the synergistic interactions between Co and Fe significantly reduced the OER overpotential.Additionally,the 1D rigid MnO_(2) acted as protective armor,ensuring the stability of active sites within CoFePBA during the OER.The synthesized MnO_(2)@CoFePBA achieved an overpotential of 1.614 V at 10 mA/cm^(2) and a small Tafel slope of 94 mV/dec and demonstrated stable performance for over 200 h.This work offers new insights into the rational design of various PBA-based nanocomposites with high activity and stability.
