在jetson-nx上文件夹中的whl包就能安装了,在PC的windows上直接pip install mediapipe就能安装
目录
[1 全身姿态检测](#1 全身姿态检测)
[1.1 基本使用](#1.1 基本使用)
[1.2 关键点分析](#1.2 关键点分析)
[1.2.1 确定对应关系](#1.2.1 确定对应关系)
[1.2.2 通过对应关系判断](#1.2.2 通过对应关系判断)
[1.3 搭配摄像头使用](#1.3 搭配摄像头使用)
[2 手部姿态检测](#2 手部姿态检测)
[2.1 基本使用](#2.1 基本使用)
[2.2 关键点分析](#2.2 关键点分析)
[2.2.1 确定对应关系](#2.2.1 确定对应关系)
[2.2.2 通过对应关系判断](#2.2.2 通过对应关系判断)
[2.3 搭配摄像头使用](#2.3 搭配摄像头使用)
1 全身姿态检测
1.1 基本使用
python
import cv2
import mediapipe as mp
from PIL import ImageFont,ImageDraw,Image
mp_drawing = mp.solutions.drawing_utils
mp_pose = mp.solutions.pose
pose = mp_pose.Pose(min_detection_confidence=0.5, min_tracking_confidence=0.5)
image = cv2.imread('right_foot_aboard.jpg')
image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
# image = cv2.cvtColor(cv2.flip(image, 1), cv2.COLOR_BGR2RGB)
# To improve performance, optionally mark the image as not writeable to
# pass by reference.
image.flags.writeable = False
results = pose.process(image)
# Draw the pose annotation on the image.
image.flags.writeable = True
image = cv2.cvtColor(image, cv2.COLOR_RGB2BGR)
mp_drawing.draw_landmarks(image, results.pose_landmarks, mp_pose.POSE_CONNECTIONS)
pose.close()
cv2.imshow('MediaPipe Pose', image)
cv2.waitKey(0)
cv2.destroyAllWindows()
1.2 关键点分析
1.2.1 确定对应关系
我们可以对识别到的点进行操作,比如检测左侧脚尖在上,还是右脚脚尖在上,也就是32点和31点哪一个在y轴值更小
首先打印一下result
一共是33个点,我们看最后的31和32
我们可以根据图与结果分析出来下面几个信息
- x轴和y轴以图像的左上角为原点,值越大越靠右或靠下。z轴以屏幕为原点,值越小距离屏幕越远
- x,y,z是比例值。x估计是与图像宽的比例,y估计是与图像高的比例,z不知道
- visibility是可见度,值越大越可见,值越小说明可能被遮挡
1.2.2 通过对应关系判断
我们可以通过遍历拿到 左脚、右脚脚尖与图像的比例,然后把他们进行比较
我们换一张图测试一下
1.3 搭配摄像头使用
python
import cv2
import mediapipe as mp
from PIL import ImageFont, ImageDraw, Image
mp_drawing = mp.solutions.drawing_utils
mp_pose = mp.solutions.pose
pose = mp_pose.Pose(min_detection_confidence=0.5, min_tracking_confidence=0.5)
cap = cv2.VideoCapture(0)
while True:
ret, frame = cap.read()
if ret:
image = cv2.cvtColor(cv2.flip(frame, 1), cv2.COLOR_BGR2RGB)
image.flags.writeable = False
results = pose.process(image)
image.flags.writeable = True
image = cv2.cvtColor(image, cv2.COLOR_RGB2BGR)
mp_drawing.draw_landmarks(image, results.pose_landmarks, mp_pose.POSE_CONNECTIONS)
cv2.imshow("capture", image)
k = cv2.waitKey(1)
if k == ord(' ') :
break
# 关闭视频捕获器
cap.release()
# 销毁所有窗口
cv2.destroyAllWindows()
pose.close()
测试过在jetson-nx上用GPU是流畅的。在PC上CPU(CPU与内存配置如下图)是流畅的(GPU没测)
2 手部姿态检测
参考 JetBot手势识别实验_from jetbot import robot-CSDN博客
2.1 基本使用
python
import cv2
import mediapipe as mp
# 初始化MediaPipe Hands模块
mp_hands = mp.solutions.hands
hands = mp_hands.Hands(static_image_mode=True,
max_num_hands=2,
min_detection_confidence=0.5,
min_tracking_confidence=0.5)
mp_drawing = mp.solutions.drawing_utils # 用于绘制关键点的工具
# 读取图片
image_path = '1.jpg' # 这里替换为你的图片路径
image = cv2.imread(image_path)
if image is None:
print("Cannot find the image.")
else:
# 将图像从BGR转换为RGB
image_rgb = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
# 处理图像,检测手部
results = hands.process(image_rgb)
# 将图像从RGB转回BGR以显示
image_bgr = cv2.cvtColor(image_rgb, cv2.COLOR_RGB2BGR)
# 绘制手部关键点
if results.multi_hand_landmarks:
for hand_landmarks in results.multi_hand_landmarks:
mp_drawing.draw_landmarks(image_bgr, hand_landmarks, mp_hands.HAND_CONNECTIONS)
# 显示图像
cv2.imshow('Hand Detection', image_bgr)
cv2.waitKey(0) # 等待按键
cv2.destroyAllWindows()
# # 可选:保存输出图像
# output_image_path = 'path_to_your_output_image.jpg' # 输出文件的路径
# cv2.imwrite(output_image_path, image_bgr)
# print("Output image is saved as", output_image_path)
# 释放资源
hands.close()
2.2 关键点分析
2.2.1 确定对应关系
与全身姿态用法相同了,我们简单说一下
results.multi_hand_landmarks[0]可能会有直接变成列表的方法,我这里就直接用正则取了
python
import cv2
import mediapipe as mp
import re
p = re.compile(r'landmark {\n x: .*\n y: .*\n z: .*\n}')
# 初始化MediaPipe Hands模块
mp_hands = mp.solutions.hands
hands = mp_hands.Hands(static_image_mode=True,
max_num_hands=2,
min_detection_confidence=0.5,
min_tracking_confidence=0.5)
mp_drawing = mp.solutions.drawing_utils # 用于绘制关键点的工具
# 读取图片
image_path = '1.jpg' # 这里替换为你的图片路径
image = cv2.imread(image_path)
if image is None:
print("Cannot find the image.")
else:
# 将图像从BGR转换为RGB
image_rgb = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
# 处理图像,检测手部
results = hands.process(image_rgb)
# print()
id = 0
for result in p.findall(str(results.multi_hand_landmarks[0])):
print('id',id)
id = id + 1
print(result)
print()
# 将图像从RGB转回BGR以显示
image_bgr = cv2.cvtColor(image_rgb, cv2.COLOR_RGB2BGR)
# 绘制手部关键点
if results.multi_hand_landmarks:
for hand_landmarks in results.multi_hand_landmarks:
mp_drawing.draw_landmarks(image_bgr, hand_landmarks, mp_hands.HAND_CONNECTIONS)
cv2.imshow('Hand Detection', image_bgr)
cv2.waitKey(0) # 等待按键
cv2.destroyAllWindows()
hands.close()
我们重点关注食指,通过点位图来看不是8就16
对比图像来看,食指的顶点应该过图像的一半,所以16不符合。之后考虑8,观察其他点与8点的y值可以看出8点比其他的点的y值要小,基本可以断定8点就是食指的顶点
2.2.2 通过对应关系判断
我们比如要判断食指是否伸展,那么就判断 |8的y-0的y| 是否大于 |7的y-0的y|
- 上面这个条件仅考虑手掌面对摄像头或背对摄像头的情况,不考虑手掌冲上或冲下的情况
python
import cv2
import mediapipe as mp
import re
p = re.compile(r'y: (.*)')
# 初始化MediaPipe Hands模块
mp_hands = mp.solutions.hands
hands = mp_hands.Hands(static_image_mode=True,
max_num_hands=2,
min_detection_confidence=0.5,
min_tracking_confidence=0.5)
mp_drawing = mp.solutions.drawing_utils # 用于绘制关键点的工具
# 读取图片
image_path = '6.jpg' # 这里替换为你的图片路径
image = cv2.imread(image_path)
if image is None:
print("Cannot find the image.")
else:
# 将图像从BGR转换为RGB
image_rgb = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
# 处理图像,检测手部
results = hands.process(image_rgb)
y_list = p.findall(str(results.multi_hand_landmarks[0]))
if abs(float(y_list[8])-float(y_list[0]))>abs(float(y_list[7])-float(y_list[0])):
print('食指伸展')
else:
print('食指不伸展')
# 将图像从RGB转回BGR以显示
image_bgr = cv2.cvtColor(image_rgb, cv2.COLOR_RGB2BGR)
# 绘制手部关键点
if results.multi_hand_landmarks:
for hand_landmarks in results.multi_hand_landmarks:
mp_drawing.draw_landmarks(image_bgr, hand_landmarks, mp_hands.HAND_CONNECTIONS)
cv2.imshow('Hand Detection', image_bgr)
cv2.waitKey(0) # 等待按键
cv2.destroyAllWindows()
hands.close()
换一张图测一下
如果要通过5个手指的判断手势是有点复杂的,而且mediapipe也不一定准,所以不建议通过mediapipe做手势识别
2.3 搭配摄像头使用
注意在代码中把static_image_mode改为False
python
import cv2
import mediapipe as mp
mp_hands = mp.solutions.hands
hands = mp_hands.Hands(static_image_mode=False,
max_num_hands=2,
min_detection_confidence=0.5,
min_tracking_confidence=0.5)
mp_drawing = mp.solutions.drawing_utils
cap = cv2.VideoCapture(0)
while True:
ret, frame = cap.read()
if ret:
image_rgb = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
results = hands.process(image_rgb)
image_bgr = cv2.cvtColor(image_rgb, cv2.COLOR_RGB2BGR)
if results.multi_hand_landmarks:
for hand_landmarks in results.multi_hand_landmarks:
mp_drawing.draw_landmarks(image_bgr, hand_landmarks, mp_hands.HAND_CONNECTIONS)
cv2.imshow("capture", image_bgr)
k = cv2.waitKey(1)
if k == ord(' '):
break
cap.release()
cv2.destroyAllWindows()
测试环境与全身姿态检测相同,运行流畅。在nx中会出现下面两个warning,就结果来看问题不大