Abstract: The present disclosure relates to a totem pole bridgeless power factor correction device and a power supply system. The device includes a power factor correction module. The power factor correction module includes a first transistor, a second transistor, a third transistor, a fourth transistor, an inductor and a control module for generating a zeroth control signal in the first time period to control the third transistor and the fourth transistor to be in an off state, performing a zero-crossing detection on an AC voltage in the first time period, generating a first control signal to control a conduction state of the first transistor and the second transistor before the AC voltage crosses zero, and generating a second control signal to control the conduction state of the first transistor and the second transistor after the AC voltage crosses zero.

Abstract: This application relates to the field of artificial intelligence, and specifically, to the field of computer vision. The method includes: performing feature extraction on an image to obtain a basic feature map of the image; determining a proposal of a region possibly including a pedestrian in the image; processing the basic feature map of the image to obtain an object visibility map in which a response to a pedestrian visible part is greater than a response to a pedestrian blocked part and a background part; performing weighted summation processing on the object visibility map and the basic feature map to obtain an enhanced feature map of the image; and determining, based on the proposal of the image and the enhanced feature map of the image, a bounding box including a pedestrian in the image and a confidence level of the bounding box including the pedestrian in the image.