Mediapipe process() 第一个“自我”参数

Posted 2023-02-23

【中文标题】Mediapipe process() 第一个“自我”参数

【英文标题】：Mediapipe process() first 'self' argument

【发布时间】：2021-12-11 18:50:53

【问题描述】：

我正在尝试使用 mediapipe 来跟踪手部。我在 Windows 10 上使用 Python 3.7.9，我的代码如下：

import cv2
import mediapipe as mp

mp_drawing = mp.solutions.drawing_utils
mp_hands = mp.solutions.hands
cap = cv2.VideoCapture(0)

while (True):
  success, img = cap.read()
  imgRGB = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
  results = mp_hands.Hands.process(imgRGB)
  print(result)
  if cv2.waitKey(10) & 0xFF == ord('q'):
    break

我收到此错误：

Traceback (most recent call last):
  File "C:/Users/Tomáš/PycharmProjects/pythonProject/hand_detect.py", line 11, in <module>
    results = mp_hands.Hands.process(imgRGB)
TypeError: process() missing 1 required positional argument: 'image'
[ WARN:1] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (438) `anonymous-namespace'::SourceReaderCB::~SourceReaderCB terminating async callback

错误表示我需要在传递参数“图像”之前再传递一个参数“自我”。我已经浏览了很多，并且每个相关代码都没有在 process() 函数中使用第一个参数。谁能帮我解决这个错误？

【问题讨论】：

如果没有完全可重现的示例，很难帮助您。或许the mediapipe documentation给你答案，有静态图片的例子。

您能否检查 cv2 的文档以及此函数返回的 cvtColor。您可以在两者之间使用 breakpoint() 进行调试

【参考方案1】：

问题是您在处理它之前没有创建 mp_hands.Hands 的对象。以下代码解决了它并打印了一些结果。顺便说一句，这在我之前评论过的文档链接中有很好的记录..：

import cv2
import mediapipe as mp

mp_drawing = mp.solutions.drawing_utils
mp_hands = mp.solutions.hands
cap = cv2.VideoCapture(0, cv2.CAP_DSHOW)  # i had problems before reading webcam feeds, so i added cv2.CAP_DSHOW here 

while True:
    success, img = cap.read()
    imgRGB = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)

    # you have to create an object of mp_hands.Hands to get results
    # alternatively you could do: results = mp_hands.Hands().process(imgRGB)
    with mp_hands.Hands() as hands:
        results = hands.process(imgRGB)

    # continue loop if no results were found
    if not results.multi_hand_landmarks:
        continue

    # print some results
    for hand_landmarks in results.multi_hand_landmarks:
        print(
            f'Index finger tip coordinates: (',
            f'hand_landmarks.landmark[mp_hands.HandLandmark.INDEX_FINGER_TIP].x, '
            f'hand_landmarks.landmark[mp_hands.HandLandmark.INDEX_FINGER_TIP].y)'
        )

    if cv2.waitKey(10) & 0xFF == ord('q'):
        break

编辑： 这或多或少与here 中的代码相同：

import cv2
import mediapipe as mp

mp_drawing = mp.solutions.drawing_utils
mp_drawing_styles = mp.solutions.drawing_styles
mp_hands = mp.solutions.hands

# initialize webcam
cap = cv2.VideoCapture(0, cv2.CAP_DSHOW)

with mp_hands.Hands(model_complexity=0,
                    min_detection_confidence=0.5,
                    min_tracking_confidence=0.5) as hands:
    while cap.isOpened():
        success, image = cap.read()
        if not success:
            print("Ignoring empty camera frame.")
            # If loading a video, use 'break' instead of 'continue'.
            continue

        # To improve performance, optionally mark the image as not writeable to
        # pass by reference.
        image.flags.writeable = False
        image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
        results = hands.process(image)

        # Draw the hand annotations on the image.
        image.flags.writeable = True
        image = cv2.cvtColor(image, cv2.COLOR_RGB2BGR)
        if results.multi_hand_landmarks:
            for hand_landmarks in results.multi_hand_landmarks:
                mp_drawing.draw_landmarks(
                    image,
                    hand_landmarks,
                    mp_hands.HAND_CONNECTIONS,
                    mp_drawing_styles.get_default_hand_landmarks_style(),
                    mp_drawing_styles.get_default_hand_connections_style())
        # Flip the image horizontally for a selfie-view display.
        cv2.imshow('MediaPipe Hands', cv2.flip(image, 1))
        if cv2.waitKey(5) & 0xFF == 27:
            break
cap.release()

【讨论】：

with mp_hands.Hands() as hands：这一行导致另一个错误：FileNotFoundError: The path does not exist.

我编辑了我的帖子，尝试将第二个代码示例复制粘贴到一个新文件中并运行它。

它没有解决问题。我仍然遇到同样的错误

复制并粘贴完整的错误日志。除此之外，您可以尝试使用 pip uninstall -y cv2 mediapipe pip install cv2 mediapipe

卸载并重新安装软件包

Traceback : File "C:/Users/Tomáš/PycharmProjects/ruce/main.py", line 13, in min_tracking_confidence=0.5) as hands: File "C:\Users\Tomáš \AppData\Local\Programs\Python\Python37\lib\site-packages\mediapipe\python\solutions\hands.py"，第 127 行，在 init 中输出=['multi_hand_landmarks', 'multi_handedness' ]) 文件“C:\Users\Tomáš\AppData\Local\Programs\Python\Python37\lib\site-packages\mediapipe\python\solution_base.py”，第 238 行，在 init binary_graph_path= os.path.join(root_path, binary_graph_path)) FileNotFoundError: 路径不存在。