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How to get faces with different angles before training? #10
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@GeYongtao |
I get it. Thanks a lot! |
@GeYongtao 为了方便旋转框,把框变成了正方形,我论文中评测结果时候也是用正方形评测的。实际上,正方形评测结果是偏低的,因为数据集的标注都是椭圆或者长方形。在我的实验中,评测时候用一些简单的策略把正方形换算成长方形,结果就会有0.5-1个点的提升,比如100个FP的召回从88.1会提升到88.8 |
@jack-cv 还有一个问题,请问第一个阶段训练的face/non face分类输出和bounding box回归对第二阶段的网络训练有帮助吗?(同理:第二阶段的分类输出和bounding box回归对第三阶段的网络)
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@GeYongtao 在我的实现中,各个阶段的边框回归没有关联,各自训练各自的。各阶段的face/non face分类有关联,体现在下一级的负样本是上一级过滤得到。我记得Cascade CNN和MTCNN应该也是这样训练的。 |
@jack-cv 您好,请问你训练的时候,是先把人脸截出来吗?还有就是PCN训练的框是正立的还是斜着的,看您上面的例子似乎框是正立的?那这个正立的框是怎么得到的呢?是取斜着框的x和y的最大最小得到的吗?还是直接将斜着的框转到正立的方向呢? |
@jack-cv 另一个问题,你旋转的时候没有考虑图片被边缘截掉的问题吗?是不是应该扩大边界? |
@jack-cv 你好,想请问训练第三阶段的角度回归时,怎样计算角度的回归值标签数据 |
Hi,@jack-cv. As is shown in the picture, when rotating a face, the bounding box will be rotated accordingly. Thus would lead some undefined pixes around a face(e.g. black pixes in the above image). How do you handle this problem? In other words, how do you ajust bounding box label according to the rotate angle?
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