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facedetectiononmxnetbycnn's Introduction

In this assignment,we trained a CNN model to predict if a image has faces,i.e. face detection. And we implemented it using Mxnet,a open source deep learning frame. To detect the faces,the procedure is just as the following:

1.bash --- $ ./buildDatabase.sh

2.bash --- $ python train.py

3.bash --- $ python detect_face.py

Chinese Document

为了实现人脸检测,培训了卷积神经网络模型,然后使用滑动窗口算法去检测原始图像中某一个区域是否含有人脸。 在这个任务中,我们使用了Mxnet框架,一个开源的、轻量级的深度学习框架。

先介绍一下目录结构:

buildDatabase.sh 根据原始数据构建适合Mxnet处理的数据形式

data目录 存放原始数据集,data下一个文件夹为1类图片

detect_face.py 检测单张图片中的人脸 im2rec.py Mxnet自带工具,构建mxnet可处理的数据集(详情移步mxnet)

make_list.py 创建原始数据集清单文件(详情移步mxnet) predict 存放单张图片的由mxnet生成的数据信息 single 存放原始的单张图片

train.py 模型培训

使用方法:

1.bash --- $ ./buildDatabase.sh

2.bash --- $ python train.py

3.bash --- $ python detect_face.py

总体流程:

1.自己准备好数据集

2.使用mxnet自带的工具make_list.py im2rec.py 构建适合 mxnet处理的数据源

3.使用mxnet的symbol搭建CNN,并进行模型培训

4.采用滑动窗口算法将图像进行分割预测,选取预测度最高的图像局部区域作为人脸区域

mxnet的一些参数说明:

1.epoch:将所有数据让模型过一遍称为 一个 epoch

2.batch:将一个epoch中的分为几次feed模型,一个feed为一个batch

3.batch_size:一个batch中包含多少数据样本,称为batch_size

4.num_batch:batch的数目

5.num_epoch:epoch的数目

6.epoch只在模型培训时出现,predict时不会出现

7.使用不同的epoch,会让mxnet培训出不同的model

说明: 1.此项目还存在诸多问题,譬如数据过拟合,涉及了大量的磁盘I/O操作,单张图片预测时间过长,并不能真实地进行人脸检测,所以为1.0版本,后面会进行大量的改进

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