在用于人脸检测的图像传感器中,帧率和功耗均是关键指标。针对人脸检测智能图像传感器帧率较低和功耗较高的问题,设计了一种高速低功耗读出电路,利用卷积神经网络进行人脸检测,将原始图像输出的数据量压缩了66.6%,减少了模数转换的次数...在用于人脸检测的图像传感器中,帧率和功耗均是关键指标。针对人脸检测智能图像传感器帧率较低和功耗较高的问题,设计了一种高速低功耗读出电路,利用卷积神经网络进行人脸检测,将原始图像输出的数据量压缩了66.6%,减少了模数转换的次数。所使用的网络可以实现3×3卷积、修正线性单元、2×2最大池化和1×1全连接层。读出电路支持可配置时序,通过配置不同的时序,读出电路适用于灰度成像模式和卷积模式。基于55 nm CMOS工艺进行设计,电源供电电压为1.2 V,卷积模式下输出帧率达到603帧/s,读出电路的总功耗为137μW。在Labeled Faces in the Wild数据集中,人脸检测的准确率达到了98.3%。展开更多
The BaF2 （barium fluoride） spectrometer is one of the experiment facilities at the CSNS-WNS（White Neutron Source at China Spallation Neutron Source）, currently under construction. It is designed to precisely measu...The BaF2 （barium fluoride） spectrometer is one of the experiment facilities at the CSNS-WNS（White Neutron Source at China Spallation Neutron Source）, currently under construction. It is designed to precisely measure the（n, γ） cross section, with 92 crystal elements and complete 4π steradian coverage. In order to improve the precision of measurement, in this paper, a new precise digitization and readout method is proposed. Waveform digitizing with 1 GSps sampling rate and 12-bit resolution is used to precisely capture the detector signal. To solve the problem of massive data readout and processing, the readout electronics is designed as a distributed architecture with 4 PXIe crates. The digitized signal is concentrated to the PXIe crate controller through a PCIe bus on the backplane and transmitted to the data acquisition system over gigabit Ethernet in parallel. Besides, the clock and trigger can be fanned out synchronously to every electronic channel over a high-precision distribution network. Test results show that the prototype of the readout electronics can achieve good performance and meet the requirements of the CSNS-WNS BaF2 spectrometer.展开更多
文摘在用于人脸检测的图像传感器中,帧率和功耗均是关键指标。针对人脸检测智能图像传感器帧率较低和功耗较高的问题,设计了一种高速低功耗读出电路,利用卷积神经网络进行人脸检测,将原始图像输出的数据量压缩了66.6%,减少了模数转换的次数。所使用的网络可以实现3×3卷积、修正线性单元、2×2最大池化和1×1全连接层。读出电路支持可配置时序,通过配置不同的时序,读出电路适用于灰度成像模式和卷积模式。基于55 nm CMOS工艺进行设计,电源供电电压为1.2 V,卷积模式下输出帧率达到603帧/s,读出电路的总功耗为137μW。在Labeled Faces in the Wild数据集中,人脸检测的准确率达到了98.3%。
基金Supported by National Research and Development plan(2016YFA0401602)NSAF(U1530111)
文摘The BaF2 （barium fluoride） spectrometer is one of the experiment facilities at the CSNS-WNS（White Neutron Source at China Spallation Neutron Source）, currently under construction. It is designed to precisely measure the（n, γ） cross section, with 92 crystal elements and complete 4π steradian coverage. In order to improve the precision of measurement, in this paper, a new precise digitization and readout method is proposed. Waveform digitizing with 1 GSps sampling rate and 12-bit resolution is used to precisely capture the detector signal. To solve the problem of massive data readout and processing, the readout electronics is designed as a distributed architecture with 4 PXIe crates. The digitized signal is concentrated to the PXIe crate controller through a PCIe bus on the backplane and transmitted to the data acquisition system over gigabit Ethernet in parallel. Besides, the clock and trigger can be fanned out synchronously to every electronic channel over a high-precision distribution network. Test results show that the prototype of the readout electronics can achieve good performance and meet the requirements of the CSNS-WNS BaF2 spectrometer.
