# HandTrackingModule.py
import cv2
import mediapipe as mp
class HandDetector:
"""
使用mediapipe库查找手。导出地标像素格式。添加了额外的功能。
如查找方式，许多手指向上或两个手指之间的距离。而且提供找到的手的边界框信息。
"""
def __init__(self, mode=False, maxHands=2, detectionCon=0.5, minTrackCon = 0.5):
"""
:param mode: 在静态模式下，对每个图像进行检测
:param maxHands: 要检测的最大手数
:param detectionCon: 最小检测置信度
:param minTrackCon: 最小跟踪置信度
"""
self.mode = mode
self.maxHands = maxHands
self.modelComplex = False
self.detectionCon = detectionCon
self.minTrackCon = minTrackCon
# 初始化手部识别模型
self.mpHands = mp.solutions.hands
self.hands = self.mpHands.Hands(self.mode, self.maxHands, self.modelComplex,
self.detectionCon, self.minTrackCon)
self.mpDraw = mp.solutions.drawing_utils # 初始化绘图器
self.tipIds = [4, 8, 12, 16, 20] # 指尖列表
self.fingers = []
self.lmList = []
def findHands(self, img, draw=True):
"""
从图像(BRG)中找到手部。
:param img: 用于查找手的图像。
:param draw: 在图像上绘制输出的标志。
:return: 带或不带图形的图像
"""
imgRGB = cv2.cvtColor(img, cv2.COLOR_BGR2RGB) # 将传入的图像由BGR模式转标准的Opencv模式——RGB模式，
self.results = self.hands.process(imgRGB)
if self.results.multi_hand_landmarks:
for handLms in self.results.multi_hand_landmarks:
if draw:
self.mpDraw.draw_landmarks(img, handLms,
self.mpHands.HAND_CONNECTIONS)
return img
def findPosition(self, img, handNo=0, draw=True):
"""
查找单手的地标并将其放入列表中像素格式。还可以返回手部周围的边界框。
:param img: 要查找的主图像
:param handNo: 如果检测到多只手，则为手部id
:param draw: 在图像上绘制输出的标志。(默认绘制矩形框)
:return: 像素格式的手部关节位置列表；手部边界框
"""
xList = []
yList = []
bbox = []
bboxInfo =[]
self.lmList = []
if self.results.multi_hand_landmarks:
myHand = self.results.multi_hand_landmarks[handNo]
for id, lm in enumerate(myHand.landmark):
h, w, c = img.shape
px, py = int(lm.x * w), int(lm.y * h)
xList.append(px)
yList.append(py)
self.lmList.append([px, py])
if draw:
cv2.circle(img, (px, py), 5, (255, 0, 255), cv2.FILLED)
xmin, xmax = min(xList), max(xList)
ymin, ymax = min(yList), max(yList)
boxW, boxH = xmax - xmin, ymax - ymin
bbox = xmin, ymin, boxW, boxH
cx, cy = bbox[0] + (bbox[2] // 2), \
bbox[1] + (bbox[3] // 2)
bboxInfo = {"id": id, "bbox": bbox,"center": (cx, cy)}
if draw:
cv2.rectangle(img, (bbox[0] - 20, bbox[1] - 20),
(bbox[0] + bbox[2] + 20, bbox[1] + bbox[3] + 20),
(0, 255, 0), 2)
return self.lmList, bboxInfo
def fingersUp(self):
"""
查找列表中打开并返回的手指数。会分别考虑左手和右手
：return：竖起手指的列表
"""
if self.results.multi_hand_landmarks:
myHandType = self.handType()
fingers = []
# Thumb
if myHandType == "Right":
if self.lmList[self.tipIds[0]][0] > self.lmList[self.tipIds[0] - 1][0]:
fingers.append(1)
else:
fingers.append(0)
else:
if self.lmList[self.tipIds[0]][0] < self.lmList[self.tipIds[0] - 1][0]:
fingers.append(1)
else:
fingers.append(0)
# 4 Fingers
for id in range(1, 5):
if self.lmList[self.tipIds[id]][1] < self.lmList[self.tipIds[id] - 2][1]:
fingers.append(1)
else:
fingers.append(0)
return fingers
def handType(self):
"""
检查传入的手部是左还是右
：return: "Right" 或 "Left"
"""
if self.results.multi_hand_landmarks:
if self.lmList[17][0] < self.lmList[5][0]:
return "Right"
else:
return "Left"
import cv2
from HandTrackingModule import HandDetector
class Main:
def __init__(self):
self.camera = cv2.VideoCapture(0,cv2.CAP_DSHOW)
self.camera.set(3, 1280)
self.camera.set(4, 720)
def Gesture_recognition(self):
while True:
self.detector = HandDetector()
frame, img = self.camera.read()
img = self.detector.findHands(img)
lmList, bbox = self.detector.findPosition(img)
if lmList:
x_1, y_1 = bbox["bbox"][0], bbox["bbox"][1]
x1, x2, x3, x4, x5 = self.detector.fingersUp()
if (x2 == 1 and x3 == 1) and (x4 == 0 and x5 == 0 and x1 == 0):
cv2.putText(img, "2_TWO", (x_1, y_1), cv2.FONT_HERSHEY_PLAIN, 3,
(0, 0, 255), 3)
elif (x2 == 1 and x3 == 1 and x4 == 1) and (x1 == 0 and x5 == 0):
cv2.putText(img, "3_THREE", (x_1, y_1), cv2.FONT_HERSHEY_PLAIN, 3,
(0, 0, 255), 3)
elif (x2 == 1 and x3 == 1 and x4 == 1 and x5 == 1) and (x1 == 0):
cv2.putText(img, "4_FOUR", (x_1, y_1), cv2.FONT_HERSHEY_PLAIN, 3,
(0, 0, 255), 3)
elif x1 == 1 and x2 == 1 and x3 == 1 and x4 == 1 and x5 == 1:
cv2.putText(img, "5_FIVE", (x_1, y_1), cv2.FONT_HERSHEY_PLAIN, 3,
(0, 0, 255), 3)
elif x2 == 1 and (x1 == 0, x3 == 0, x4 == 0, x5 == 0):
cv2.putText(img, "1_ONE", (x_1, y_1), cv2.FONT_HERSHEY_PLAIN, 3,
(0, 0, 255), 3)
elif x1 and (x2 == 0, x3 == 0, x4 == 0, x5 == 0):
cv2.putText(img, "GOOD!", (x_1, y_1), cv2.FONT_HERSHEY_PLAIN, 3,
(0, 0, 255), 3)
cv2.imshow("camera", img)
if cv2.getWindowProperty('camera', cv2.WND_PROP_VISIBLE) < 1:
break
cv2.waitKey(1)
if cv2.waitKey(1) & 0xFF == ord("q"):
break
if __name__ == '__main__':
Solution = Main()
Solution.Gesture_recognition()
