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FPN-Feature Pyramid Network
2022-06-09 21:16:00 【GY-赵】


上图为四种金字塔的形式,分别对应思维导图中的四种介绍。
上图是FPN实现过程,主要是top-down连接和lateral横向连接。通过元素相加的方式合并feature map。

Feature Pyramid Networks for Fast R-CNN 计算公式,用来帮助RoI选择金字塔的某个level,这里224是imageNet 预训练图像大小,W,H是RoI的尺寸,K代表特征金字塔第K层, K 0 K_0 K0是 W × H = 22 4 2 W×H=224^2 W×H=2242的映射的基准,类似于基于ResNet的Fast RCNN使用C4 作为single-scale feature map,这里设 K 0 = 4 K_0=4 K0=4 。
推荐阅读:https://zhuanlan.zhihu.com/p/62604038
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