AI项目二十一：视频动态手势识别

殷忆枫2024-05-04 16:06

若该文为原创文章，转载请注明原文出处。

一、简介

人工智能的发展日新月异，也深刻的影响到人机交互领域的发展。手势动作作为一种自然、快捷的交互方式，在智能驾驶、虚拟现实等领域有着广泛的应用。手势识别的任务是，当操作者做出某个手势动作后，计算机能够快速准确的判断出该手势的类型。本文将使用ModelArts开发训练一个视频动态手势识别的算法模型，对上滑、下滑、左滑、右滑、打开、关闭等动态手势类别进行检测，实现类似隔空手势的功能。

在前面也有使用mediapipe实现类似功能。具体自行参考。

本文章参考CNN-VIT 视频动态手势识别【玩转华为云】-云社区-华为云

二、环境

使用的是AUTODL，配置如下：

镜像：PyTorch 1.7.0 Python 3.8(ubuntu18.04) Cuda 11.0

GPU ：RTX 2080 Ti(11GB) * 1升降配置

CPU12 vCPU Intel(R) Xeon(R) Platinum 8255C CPU @ 2.50GHz

三、环境搭建

1、创建虚拟环境

复制代码 
conda create -n cnn_hand_gesture_env python=3.8

2、激活

复制代码 
conda activate cnn_hand_gesture_env

3、安装依赖项

复制代码 
conda install cudatoolkit=11.3.1 cudnn=8.2.1 -y --override-channels --channel https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
复制代码 
pip install tensorflow-gpu==2.5.0 -i https://pypi.doubanio.com/simple --user

pip install opencv-contrib-python
pip install imageio
pip install imgaug
pip install tqdm
pip install IPython

pip install numpy==1.19.3 -i https://pypi.tuna.tsinghua.edu.cn/simple
pip install matplotlib==3.6

这里需要注意的是numpy版本和matplotlib版本,tensorflow2.5版本对应的numpy版本是1.19.3

如果版本过高会一直出错错误。

四、数据下载

下载数据使用的是华为云，可以自行下载或联系我。

复制代码 
import os
import moxing as mox
    
if not os.path.exists('hand_gesture'):
    mox.file.copy_parallel('obs://modelbox-course/hand_gesture', 'hand_gesture')

五、算法简介

视频动态手势识别算法首先使用预训练网络InceptionResNetV2逐帧提取视频动作片段特征，然后输入Transformer Encoder进行分类。我们使用动态手势识别样例数据集对算法进行测试，总共包含108段视频，数据集包含无效手势、上滑、下滑、左滑、右滑、打开、关闭等7种手势的视频，具体操作流程如下：

六、流程

1、将采集的视频文件解码抽取关键帧，每隔4帧保存一次，然后对图像进行中心裁剪和预处理

2、创建图像特征提取器，使用预训练模型InceptionResNetV2提取图像特征

3、提取视频特征向量，如果视频不足40帧就创建全0数组进行补白

4、创建VIT Mode

5、视频推理

6、加载VIT Model，获取视频类别索引标签

7、使用图像特征提取器InceptionResNetV2提取视频特征

8、将视频序列的特征向量输入Transformer Encoder进行预测

9、打印模型预测结果

七、测试

Autodl自带有JupyterLab, 直接运行一遍。

代码解析：

1、创建视频输入管道获取视频类别标签

复制代码 
videos = glob.glob('hand_gesture/*.mp4')
np.random.shuffle(videos)
labels = [int(video.split('_')[-2]) for video in videos]
videos[:5], len(videos), labels[:5], len(videos)

2、视频抽帧预处理

复制代码 
def load_video(file_name):
    cap = cv2.VideoCapture(file_name) 
    # 每隔多少帧抽取一次
    frame_interval = 4
    frames = []
    count = 0
    while True:
        ret, frame = cap.read()
        if not ret:
            break
        
        # 每隔frame_interval帧保存一次
        if count % frame_interval == 0:
            # 中心裁剪    
            frame = crop_center_square(frame)
            # 缩放
            frame = cv2.resize(frame, (IMG_SIZE, IMG_SIZE))
            # BGR -> RGB  [0,1,2] -> [2,1,0]
            frame = frame[:, :, [2, 1, 0]]
            frames.append(frame)
        count += 1
        
    return np.array(frames)

3、创建图像特征提取器

复制代码 
def get_feature_extractor():
    feature_extractor = keras.applications.inception_resnet_v2.InceptionResNetV2(
        weights = 'imagenet',
        include_top = False,
        pooling = 'avg',
        input_shape = (IMG_SIZE, IMG_SIZE, 3)
    )
    
    preprocess_input = keras.applications.inception_resnet_v2.preprocess_input
    
    inputs = keras.Input((IMG_SIZE, IMG_SIZE, 3))
    preprocessed = preprocess_input(inputs)
    outputs = feature_extractor(preprocessed)
    
    model = keras.Model(inputs, outputs, name = 'feature_extractor')
    
    return model

4、提取视频图像特征

复制代码 
def load_data(videos, labels):
    
    video_features = []

    for video in tqdm(videos):
        frames = load_video(video)
        counts = len(frames)
        # 如果帧数小于MAX_SEQUENCE_LENGTH
        if counts < MAX_SEQUENCE_LENGTH:
            # 补白
            diff = MAX_SEQUENCE_LENGTH - counts
            # 创建全0的numpy数组
            padding = np.zeros((diff, IMG_SIZE, IMG_SIZE, 3))
            # 数组拼接
            frames = np.concatenate((frames, padding))
        # 获取前MAX_SEQUENCE_LENGTH帧画面
        frames = frames[:MAX_SEQUENCE_LENGTH, :]
        # 批量提取特征
        video_feature = feature_extractor.predict(frames)
        video_features.append(video_feature)
        
    return np.array(video_features), np.array(labels)

5、编码器

复制代码 
# 编码器
class TransformerEncoder(layers.Layer):
    
    def __init__(self, num_heads, embed_dim):
        super().__init__()
        self.p_embedding = PositionalEmbedding(MAX_SEQUENCE_LENGTH, NUM_FEATURES)
        self.attention = layers.MultiHeadAttention(num_heads=num_heads, key_dim=embed_dim, dropout=0.1)
        self.layernorm = layers.LayerNormalization()
    
    def call(self,x):
        # positional embedding
        positional_embedding = self.p_embedding(x)
        # self attention
        attention_out = self.attention(
            query = positional_embedding,
            value = positional_embedding,
            key = positional_embedding,
            attention_mask = None
        )
        # layer norm with residual connection        
        output = self.layernorm(positional_embedding + attention_out)
        return output

6、训练模式

复制代码 
history = model.fit(train_dataset,
                    epochs = 1000,
                    steps_per_epoch = train_count // batch_size, 
                    validation_steps = test_count // batch_size, 
                    validation_data = test_dataset,
                    callbacks = [checkpoint, earlyStopping, rlp])

7、测试

复制代码 
# 视频预测
def testVideo():
    test_file = random.sample(videos, 1)[0]
    label = test_file.split('_')[-2]

    print('文件名:{}'.format(test_file) )
    print('真实类别:{}'.format(label_to_name.get(int(label))) )

    # 读取视频每一帧
    frames = load_video(test_file)
    # 挑选前帧MAX_SEQUENCE_LENGTH显示
    frames = frames[:MAX_SEQUENCE_LENGTH].astype(np.uint8)
    # 保存为GIF
    imageio.mimsave('animation.gif', frames, duration=10)
    # 获取特征
    feat = getVideoFeat(frames)
    # 模型推理
    prob = model.predict(tf.expand_dims(feat, axis=0))[0]
    
    print('预测类别：')
    for i in np.argsort(prob)[::-1][:5]:
        print('{}: {}%'.format(label_to_name[i], round(prob[i]*100, 2)))
    
    #return display(Image(open('animation.gif', 'rb').read()))

8、源码

复制代码 
import cv2
import glob
import numpy as np
from tqdm import tqdm
import tensorflow as tf
from tensorflow import keras
from tensorflow.keras import layers
import matplotlib.pyplot as plt

from collections import Counter
import random
import imageio
from IPython.display import Image

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

#%matplotlib inline

MAX_SEQUENCE_LENGTH = 40
IMG_SIZE = 299
NUM_FEATURES = 1536

# 图像中心裁剪
def crop_center_square(img):
    h, w = img.shape[:2]
    square_w = min(h, w)
    
    start_x = w // 2 - square_w // 2
    end_x = start_x + square_w
    
    start_y = h // 2 - square_w // 2
    end_y = start_y + square_w
    
    result = img[start_y:end_y, start_x:end_x]
    
    return result

# 视频抽帧预处理
def load_video(file_name):
    cap = cv2.VideoCapture(file_name) 
    # 每隔多少帧抽取一次
    frame_interval = 4
    frames = []
    count = 0
    while True:
        ret, frame = cap.read()
        if not ret:
            break
        
        # 每隔frame_interval帧保存一次
        if count % frame_interval == 0:
            # 中心裁剪    
            frame = crop_center_square(frame)
            # 缩放
            frame = cv2.resize(frame, (IMG_SIZE, IMG_SIZE))
            # BGR -> RGB  [0,1,2] -> [2,1,0]
            frame = frame[:, :, [2, 1, 0]]
            frames.append(frame)
        count += 1
        
    return np.array(frames) 

# 创建图像特征提取器
def get_feature_extractor():
    feature_extractor = keras.applications.inception_resnet_v2.InceptionResNetV2(
        weights = 'imagenet',
        include_top = False,
        pooling = 'avg',
        input_shape = (IMG_SIZE, IMG_SIZE, 3)
    )
    
    preprocess_input = keras.applications.inception_resnet_v2.preprocess_input
    
    inputs = keras.Input((IMG_SIZE, IMG_SIZE, 3))
    preprocessed = preprocess_input(inputs)
    outputs = feature_extractor(preprocessed)
    
    model = keras.Model(inputs, outputs, name = 'feature_extractor')
    
    return model

# 提取视频图像特征
def load_data(videos, labels):
    
    video_features = []

    for video in tqdm(videos):
        frames = load_video(video)
        counts = len(frames)
        # 如果帧数小于MAX_SEQUENCE_LENGTH
        if counts < MAX_SEQUENCE_LENGTH:
            # 补白
            diff = MAX_SEQUENCE_LENGTH - counts
            # 创建全0的numpy数组
            padding = np.zeros((diff, IMG_SIZE, IMG_SIZE, 3))
            # 数组拼接
            frames = np.concatenate((frames, padding))
        # 获取前MAX_SEQUENCE_LENGTH帧画面
        frames = frames[:MAX_SEQUENCE_LENGTH, :]
        # 批量提取特征
        video_feature = feature_extractor.predict(frames)
        video_features.append(video_feature)
        
    return np.array(video_features), np.array(labels)

# 位置编码
class PositionalEmbedding(layers.Layer):
    def __init__(self, seq_length, output_dim):
        super().__init__()
        # 构造从0~MAX_SEQUENCE_LENGTH的列表
        self.positions = tf.range(0, limit=MAX_SEQUENCE_LENGTH)
        self.positional_embedding = layers.Embedding(input_dim=seq_length, output_dim=output_dim)
    
    def call(self,x):
        # 位置编码
        positions_embedding = self.positional_embedding(self.positions)
        # 输入相加
        return x + positions_embedding
    
# 编码器
class TransformerEncoder(layers.Layer):
    
    def __init__(self, num_heads, embed_dim):
        super().__init__()
        self.p_embedding = PositionalEmbedding(MAX_SEQUENCE_LENGTH, NUM_FEATURES)
        self.attention = layers.MultiHeadAttention(num_heads=num_heads, key_dim=embed_dim, dropout=0.1)
        self.layernorm = layers.LayerNormalization()
    
    def call(self,x):
        # positional embedding
        positional_embedding = self.p_embedding(x)
        # self attention
        attention_out = self.attention(
            query = positional_embedding,
            value = positional_embedding,
            key = positional_embedding,
            attention_mask = None
        )
        # layer norm with residual connection        
        output = self.layernorm(positional_embedding + attention_out)
        return output
    
def video_cls_model(class_vocab):
    # 类别数量
    classes_num = len(class_vocab)
    # 定义模型
    model = keras.Sequential([
        layers.InputLayer(input_shape=(MAX_SEQUENCE_LENGTH, NUM_FEATURES)),
        TransformerEncoder(2, NUM_FEATURES),
        layers.GlobalMaxPooling1D(),
        layers.Dropout(0.1),
        layers.Dense(classes_num, activation="softmax")
    ])
    # 编译模型
    model.compile(optimizer = keras.optimizers.Adam(1e-5), 
                  loss = keras.losses.SparseCategoricalCrossentropy(from_logits=False),
                  metrics = ['accuracy']
    )
    return model

# 获取视频特征
def getVideoFeat(frames):
    
    frames_count = len(frames)
    
    # 如果帧数小于MAX_SEQUENCE_LENGTH
    if frames_count < MAX_SEQUENCE_LENGTH:
        # 补白
        diff = MAX_SEQUENCE_LENGTH - frames_count
        # 创建全0的numpy数组
        padding = np.zeros((diff, IMG_SIZE, IMG_SIZE, 3))
        # 数组拼接
        frames = np.concatenate((frames, padding))

    # 取前MAX_SEQ_LENGTH帧
    frames = frames[:MAX_SEQUENCE_LENGTH,:]
    # 计算视频特征 N, 1536
    video_feat = feature_extractor.predict(frames)

    return video_feat

# 视频预测
def testVideo():
    test_file = random.sample(videos, 1)[0]
    label = test_file.split('_')[-2]

    print('文件名:{}'.format(test_file) )
    print('真实类别:{}'.format(label_to_name.get(int(label))) )

    # 读取视频每一帧
    frames = load_video(test_file)
    # 挑选前帧MAX_SEQUENCE_LENGTH显示
    frames = frames[:MAX_SEQUENCE_LENGTH].astype(np.uint8)
    # 保存为GIF
    imageio.mimsave('animation.gif', frames, duration=10)
    # 获取特征
    feat = getVideoFeat(frames)
    # 模型推理
    prob = model.predict(tf.expand_dims(feat, axis=0))[0]
    
    print('预测类别：')
    for i in np.argsort(prob)[::-1][:5]:
        print('{}: {}%'.format(label_to_name[i], round(prob[i]*100, 2)))
    
    #return display(Image(open('animation.gif', 'rb').read()))

if __name__ == '__main__':
    print('Tensorflow version: {}'.format(tf.__version__))
    print('GPU available: {}'.format(tf.config.list_physical_devices('GPU')))

    # 创建视频输入管道获取视频类别标签
    videos = glob.glob('hand_gesture/*.mp4')
    np.random.shuffle(videos)
    labels = [int(video.split('_')[-2]) for video in videos]
    videos[:5], len(videos), labels[:5], len(videos)
    print(labels)
    
    # 显示数据分布情况
    counts = Counter(labels)
    print(counts)

    plt.figure(figsize=(8, 4))
    plt.bar(counts.keys(), counts.values())
    plt.xlabel('Class label')
    plt.ylabel('Number of samples')
    plt.title('Class distribution in videos')
    plt.show()
    
    # 显示视频
    label_to_name = {0:'无效手势', 1:'上滑', 2:'下滑', 3:'左滑', 4:'右滑', 5:'打开', 6:'关闭', 7:'放大', 8:'缩小'}
    print(label_to_name.get(labels[0]))

    frames = load_video(videos[0])
    frames = frames[:MAX_SEQUENCE_LENGTH].astype(np.uint8)
    imageio.mimsave('test.gif', frames, durations=10)
    print('mim save test.git')
    #display(Image(open('test.gif', 'rb').read()))
    #frames.shape
    print(frames.shape)
    
    feature_extractor = get_feature_extractor()
    feature_extractor.summary()
    
    video_features, classes = load_data(videos, labels)
    video_features.shape, classes.shape
    print(video_features.shape)
    print(classes.shape)
    
    # Dataset
    batch_size = 16

    dataset = tf.data.Dataset.from_tensor_slices((video_features, classes))

    dataset = dataset.shuffle(len(videos))

    test_count = int(len(videos) * 0.2)
    train_count = len(videos) - test_count

    dataset_train = dataset.skip(test_count).cache().repeat()
    dataset_test = dataset.take(test_count).cache().repeat()

    train_dataset = dataset_train.shuffle(train_count).batch(batch_size)
    test_dataset = dataset_test.shuffle(test_count).batch(batch_size)

    train_dataset, train_count, test_dataset, test_count
    print(train_dataset)
    print(train_count)
    print(test_dataset)
    print(test_count)
    
    # 模型实例化
    model = video_cls_model(np.unique(labels))
    # 打印模型结构
    model.summary()

    # 保存检查点
    checkpoint = ModelCheckpoint(filepath='best.h5', monitor='val_loss', save_weights_only=True, save_best_only=True, verbose=1, mode='min')
    # 提前终止
    earlyStopping = EarlyStopping(monitor='loss', patience=50, mode='min', baseline=None)
    # 减少learning rate
    rlp = ReduceLROnPlateau(monitor='loss', factor=0.7, patience=30, min_lr=1e-15, mode='min', verbose=1)

    # 开始训练
    history = model.fit(train_dataset,
                         epochs = 1000,
                         steps_per_epoch = train_count // batch_size, 
                         validation_steps = test_count // batch_size, 
                         validation_data = test_dataset,
                         callbacks = [checkpoint, earlyStopping, rlp])
    # 绘制结果
    plt.plot(history.epoch, history.history['loss'], 'r', label='loss')
    plt.plot(history.epoch, history.history['val_loss'], 'g--', label='val_loss')
    plt.title('VIT Model')
    plt.xlabel('Epoch')
    plt.ylabel('Loss')
    plt.legend()
    
    plt.plot(history.epoch, history.history['accuracy'], 'r', label='acc')
    plt.plot(history.epoch, history.history['val_accuracy'], 'g--', label='val_acc')
    plt.title('VIT Model')
    plt.xlabel('Epoch')
    plt.ylabel('Accuracy')
    plt.legend()

    # 加载训练最优权重
    model.load_weights('best.h5')

    # 模型评估
    model.evaluate(dataset.batch(batch_size))
    
    # 保存模型
    model.save('saved_model')
    print('save model')
    # 手势识别
    # 加载模型
    model = tf.keras.models.load_model('saved_model')
    # 类别标签
    label_to_name = {0:'无效手势', 1:'上滑', 2:'下滑', 3:'左滑', 4:'右滑', 5:'打开', 6:'关闭', 7:'放大', 8:'缩小'}

    # 视频推理
    for i in range(20):
        testVideo()

运行后会训练模型

并保存模型测试，

测试结果

如有侵权，或需要完整代码，请及时联系博主。

相关推荐
静心问道8 分钟前
SELF-INSTRUCT：使用自生成指令对齐语言模型
人工智能·语言模型·大模型
芷栀夏14 分钟前
基于Anything LLM的本地知识库系统远程访问实现路径
数据库·人工智能
AI生存日记14 分钟前
AI 日报：阿里、字节等企业密集发布新技术，覆盖语音、图像与药物研发等领域
人工智能·华为云·语音识别·open ai大模型
hjs_deeplearning34 分钟前
认知篇#10：何为分布式与多智能体？二者联系？
人工智能·分布式·深度学习·学习·agent·智能体
kngines1 小时前
【字节跳动】数据挖掘面试题0001：打车场景下POI与ODR空间关联查询
人工智能·数据挖掘·面试题
.30-06Springfield3 小时前
利用人名语言分类案例演示RNN、LSTM和GRU的区别（基于PyTorch）
人工智能·pytorch·python·rnn·分类·gru·lstm
xingshanchang5 小时前
PyTorch 不支持旧GPU的异常状态与解决方案：CUDNN_STATUS_NOT_SUPPORTED_ARCH_MISMATCH
人工智能·pytorch·python
reddingtons6 小时前
Adobe Firefly AI驱动设计：实用技巧与创新思维路径
大数据·人工智能·adobe·illustrator·photoshop·premiere·indesign
CertiK6 小时前
IBW 2025: CertiK首席商务官出席，探讨AI与Web3融合带来的安全挑战
人工智能·安全·web3
Deepoch7 小时前
Deepoc 大模型在无人机行业应用效果的方法
人工智能·科技·ai·语言模型·无人机
热门推荐
01Coze实战第13讲：飞书多维表格读取+豆包生图模型，轻松批量生成短剧封面02如何将markdown生成pdf03Coze扣子平台完整体验和实践（附国内和国际版对比）04GPU 进阶笔记（二）：华为昇腾 910B GPU05手机电脑之间快速传输图片视频文件，不压缩画质、不限制大小的方法！06扣子（coze）实战|我用扣子搭建了一个自动分析小红薯笔记内容的AI应用|详细步骤拆解07华为昇腾 910B 部署 DeepSeek-R1 蒸馏系列模型详细指南08鸽了六年的某大厂面试题：你会手写一个模板引擎吗？09DeepSeek各版本说明与优缺点分析10Word粘贴时出现“运行时错误53,文件未找到：MathPage.WLL“的解决方案