基于Python实现的口罩佩戴检测

作者: xiaozhu 发布时间: 2022-10-14 浏览: 994 次 编辑

import warnings

# 忽视警告

warnings.filterwarnings('ignore')

import os

import matplotlib

import cv2 as cv

import numpy as np

import matplotlib.pyplot as plt

from tensorflow.keras.callbacks import ModelCheckpoint, ReduceLROnPlateau, EarlyStopping

from tensorflow.keras.applications.imagenet_utils import preprocess_input

from tensorflow.keras import backend as K

from tensorflow.keras.optimizers import Adam

K.image_data_format() == 'channels_last'

from keras_py.utils import get_random_data

from keras_py.face_rec import mask_rec

from keras_py.face_rec import face_rec

from keras_py.mobileNet import MobileNet

from tensorflow.keras.preprocessing.image import ImageDataGenerator

# 数据集路径

basic_path = "./datasets/5f680a696ec9b83bb0037081-momodel/data/"

def letterbox_image(image, size): # 调整图片尺寸,返回经过调整的照片

new_image = cv.resize(image, size, interpolation=cv.INTER_AREA)

return new_image

read_img = cv.imread("test1.jpg")

print("调整前图片的尺寸:", read_img.shape)

read_img = letterbox_image(image=read_img, size=(50, 50))

print("调整前图片的尺寸:", read_img.shape)

def processing_data(data_path, height, width, batch_size=32, test_split=0.1): # 数据处理,batch_size默认大小为32

train_data = ImageDataGenerator(

# 对图片的每个像素值均乘上这个放缩因子,把像素值放缩到0和1之间有利于模型的收敛

rescale=1. / 255,

# 浮点数,剪切强度(逆时针方向的剪切变换角度)

shear_range=0.1,

# 随机缩放的幅度,若为浮点数,则相当于[lower,upper] = [1 - zoom_range, 1+zoom_range]

zoom_range=0.1,

# 浮点数,图片宽度的某个比例,数据提升时图片水平偏移的幅度

width_shift_range=0.1,

# 浮点数,图片高度的某个比例,数据提升时图片竖直偏移的幅度

height_shift_range=0.1,

# 布尔值,进行随机水平翻转

horizontal_flip=True,

# 布尔值,进行随机竖直翻转

vertical_flip=True,

# 在 0 和 1 之间浮动。用作验证集的训练数据的比例

validation_split=test_split

)

# 接下来生成测试集,可以参考训练集的写法

test_data = ImageDataGenerator(

rescale=1. / 255,

validation_split=test_split)

train_generator = train_data.flow_from_directory(

# 提供的路径下面需要有子目录

data_path,

# 整数元组 (height, width),默认:(256, 256)。 所有的图像将被调整到的尺寸。

target_size=(height, width),

# 一批数据的大小

batch_size=batch_size,

# "categorical", "binary", "sparse", "input" 或 None 之一。

# 默认:"categorical",返回one-hot 编码标签。

class_mode='categorical',

# 数据子集 ("training" 或 "validation")

subset='training',

seed=0)

test_generator = test_data.flow_from_directory(

data_path,

target_size=(height, width),

batch_size=batch_size,

class_mode='categorical',

subset='validation',

seed=0)

return train_generator, test_generator

# 数据路径

data_path = basic_path + 'image'

# 图像数据的行数和列数

height, width = 160, 160

# 获取训练数据和验证数据集

train_generator, test_generator = processing_data(data_path, height, width)

# 通过属性class_indices可获得文件夹名与类的序号的对应字典。

labels = train_generator.class_indices

print(labels)

# 转换为类的序号与文件夹名对应的字典

labels = dict((v, k) for k, v in labels.items())

print(labels)

pnet_path = "./datasets/5f680a696ec9b83bb0037081-momodel/data/keras_model_data/pnet.h5"

rnet_path = "./datasets/5f680a696ec9b83bb0037081-momodel/data/keras_model_data/rnet.h5"

onet_path = "./datasets/5f680a696ec9b83bb0037081-momodel/data/keras_model_data/onet.h5"

# 加载 MobileNet 的预训练模型权重

weights_path = basic_path + 'keras_model_data/mobilenet_1_0_224_tf_no_top.h5'

# 图像数据的行数和列数

height, width = 160, 160

model = MobileNet(input_shape=[height,width,3],classes=2)

model.load_weights(weights_path,by_name=True)

print('加载完成...')

def save_model(model, checkpoint_save_path, model_dir): # 保存模型

if os.path.exists(checkpoint_save_path):

print("模型加载中")

model.load_weights(checkpoint_save_path)

print("模型加载完毕")

checkpoint_period = 跟单网gendan5.comModelCheckpoint(

# 模型存储路径

model_dir + 'ep{epoch:03d}-loss{loss:.3f}-val_loss{val_loss:.3f}.h5',

# 检测的指标

monitor='val_acc',

# ‘auto’,‘min’,‘max’中选择

mode='max',

# 是否只存储模型权重

save_weights_only=False,

# 是否只保存最优的模型

save_best_only=True,

# 检测的轮数是每隔2轮

period=2

)

return checkpoint_period

checkpoint_save_path = "./results/last_one88.h5"

model_dir = "./results/"

checkpoint_period = save_model(model, checkpoint_save_path, model_dir)

# 学习率下降的方式,acc三次不下降就下降学习率继续训练

reduce_lr = ReduceLROnPlateau(

monitor='accuracy', # 检测的指标

factor=0.5, # 当acc不下降时将学习率下调的比例

patience=3, # 检测轮数是每隔三轮

verbose=2 # 信息展示模式

)

early_stopping = EarlyStopping(

monitor='val_accuracy', # 检测的指标

min_delta=0.0001, # 增大或减小的阈值

patience=3, # 检测的轮数频率

verbose=1 # 信息展示的模式

)

# 一次的训练集大小

batch_size = 64

# 图片数据路径

data_path = basic_path + 'image'

# 图片处理

train_generator, test_generator = processing_data(data_path, height=160, width=160, batch_size=batch_size, test_split=0.1)

# 编译模型

model.compile(loss='binary_crossentropy', # 二分类损失函数

optimizer=Adam(lr=0.001), # 优化器

metrics=['accuracy']) # 优化目标

# 训练模型

history = model.fit(train_generator,

epochs=20, # epochs: 整数,数据的迭代总轮数。

# 一个epoch包含的步数,通常应该等于你的数据集的样本数量除以批量大小。

steps_per_epoch=637 // batch_size,

validation_data=test_generator,

validation_steps=70 // batch_size,

initial_epoch=0, # 整数。开始训练的轮次(有助于恢复之前的训练)。

callbacks=[checkpoint_period, reduce_lr])

# 保存模型

model.save_weights(model_dir + 'temp.h5')

plt.plot(history.history['loss'],label = 'train_loss')

plt.plot(history.history['val_loss'],'r',label = 'val_loss')

plt.legend()

plt.show()

plt.plot(history.history['accuracy'],label = 'acc')

plt.plot(history.history['val_accuracy'],'r',label = 'val_acc')

plt.legend()

plt.show()