我的代码无法正常工作我正在尝试制作一个手动操作的游戏但显示错误

Question

这是我的代码：

import math
import random
import cvzone
import cv2
import numpy as np
from cvzone.HandTrackingModule import HandDetector

cap = cv2.VideoCapture(2)
cap.set(3, 1280)
cap.set(4, 720)

detector = HandDetector(detectionCon=0.8, maxHands=1)


class SnakeGameClass:
    def __init__(self, pathFood):
        self.points = []  # all points of the snake
        self.lengths = []  # distance between each point
        self.currentLength = 0  # total length of the snake
        self.allowedLength = 150  # total allowed Length
        self.previousHead = 0, 0  # previous head point

        self.imgFood = cv2.imread(pathFood, cv2.IMREAD_UNCHANGED)
        self.hFood, self.wFood, _ = self.imgFood.shape
        self.foodPoint = 0, 0
        self.randomFoodLocation()

        self.score = 0
        self.gameOver = False

    def randomFoodLocation(self):
        self.foodPoint = random.randint(100, 1000), random.randint(100, 600)

    def update(self, imgMain, currentHead):

        if self.gameOver:
            cvzone.putTextRect(imgMain, "Game Over", [300, 400],
                               scale=7, thickness=5, offset=20)
            cvzone.putTextRect(imgMain, f'Your Score: {self.score}', [300, 550],
                               scale=7, thickness=5, offset=20)
        else:
            px, py = self.previousHead
            cx, cy = currentHead

            self.points.append([cx, cy])
            distance = math.hypot(cx - px, cy - py)
            self.lengths.append(distance)
            self.currentLength += distance
            self.previousHead = cx, cy

            # Length Reduction
            if self.currentLength > self.allowedLength:
                for i, length in enumerate(self.lengths):
                    self.currentLength -= length
                    self.lengths.pop(i)
                    self.points.pop(i)
                    if self.currentLength < self.allowedLength:
                        break

            # Check if snake ate the Food
            rx, ry = self.foodPoint
            if rx - self.wFood // 2 < cx < rx + self.wFood // 2 and \
                    ry - self.hFood // 2 < cy < ry + self.hFood // 2:
                self.randomFoodLocation()
                self.allowedLength += 50
                self.score += 1
                print(self.score)

            # Draw Snake
            if self.points:
                for i, point in enumerate(self.points):
                    if i != 0:
                        cv2.line(imgMain, self.points[i - 1], self.points[i], (0, 0, 255), 20)
                cv2.circle(imgMain, self.points[-1], 20, (0, 255, 0), cv2.FILLED)

            # Draw Food
            imgMain = cvzone.overlayPNG(imgMain, self.imgFood,
                                        (rx - self.wFood // 2, ry - self.hFood // 2))

            cvzone.putTextRect(imgMain, f'Score: {self.score}', [50, 80],
                               scale=3, thickness=3, offset=10)

            # Check for Collision
            pts = np.array(self.points[:-2], np.int32)
            pts = pts.reshape((-1, 1, 2))
            cv2.polylines(imgMain, [pts], False, (0, 255, 0), 3)
            minDist = cv2.pointPolygonTest(pts, (cx, cy), True)

            if -1 <= minDist <= 1:
                print("Hit")
                self.gameOver = True
                self.points = []  # all points of the snake
                self.lengths = []  # distance between each point
                self.currentLength = 0  # total length of the snake
                self.allowedLength = 150  # total allowed Length
                self.previousHead = 0, 0  # previous head point
                self.randomFoodLocation()

        return imgMain


game = SnakeGameClass("Donut.png")

while True:
    success, img = cap.read()
    img = cv2.flip(img, 1)
    hands, img = detector.findHands(img, flipType=False)

    if hands:
        lmList = hands[0]['lmList']
        pointIndex = lmList[8][0:2]
        img = game.update(img, pointIndex)
    cv2.imshow("Image", img)
    key = cv2.waitKey(1)
    if key == ord('r'):
        game.gameOver = False

我在行中遇到错误：hands, img = detector.findHands(img, FlipType=False)

错误显示为：

       File "c:\py\Snake game\main.py", line 108, in <module>
   hands, img = detector.findHands(img, flipType=False)
 File "C:\Users\lenovo\AppData\Local\Programs\Python\Python310\lib\site-packages\cvzone\HandTrackingModule.py", line 48, in findHands
   imgRGB = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
cv2.error: OpenCV(4.5.5) D:\a\opencv-python\opencv-python\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

Answer 1

实际上cap = cv2.VideoCapture(2)有问题
将其替换为 cap = cv2.VideoCapture(0)
现在我的代码工作正常......