Python 2.7 尝试在激光指针上画圆,OpenCV
因此,我从@bradmontgomer的Github获取了代码,并试图对其进行修改。该代码首先将帧转换为HSV颜色空间,将视频帧分割为颜色通道,然后在HSV组件上执行and以识别激光器。我很难找到检测到的激光点的轮廓。这是我的密码Python 2.7 尝试在激光指针上画圆,OpenCV,python-2.7,opencv3.0,opencv-contour,Python 2.7,Opencv3.0,Opencv Contour,因此,我从@bradmontgomer的Github获取了代码,并试图对其进行修改。该代码首先将帧转换为HSV颜色空间,将视频帧分割为颜色通道,然后在HSV组件上执行and以识别激光器。我很难找到检测到的激光点的轮廓。这是我的密码 def threshold_image(self, channel): if channel == "hue": minimum = self.hue_min maximum = self.hue_max eli
def threshold_image(self, channel):
if channel == "hue":
minimum = self.hue_min
maximum = self.hue_max
elif channel == "saturation":
minimum = self.sat_min
maximum = self.sat_max
elif channel == "value":
minimum = self.val_min
maximum = self.val_max
(t, tmp) = cv2.threshold(
self.channels[channel], # src
maximum, # threshold value
0, # we dont care because of the selected type
cv2.THRESH_TOZERO_INV #t type
)
(t, self.channels[channel]) = cv2.threshold(
tmp, # src
minimum, # threshold value
255, # maxvalue
cv2.THRESH_BINARY # type
)
if channel == 'hue':
# only works for filtering red color because the range for the hue is split
self.channels['hue'] = cv2.bitwise_not(self.channels['hue'])
def detect(self, frame):
# resize the frame, blur it, and convert it to the HSV
# color space
frame = imutils.resize(frame, width=600)
hsv_img = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)
# split the video frame into color channels
h, s, v = cv2.split(hsv_img)
self.channels['hue'] = h
self.channels['saturation'] = s
self.channels['value'] = v
# Threshold ranges of HSV components; storing the results in place
self.threshold_image("hue")
self.threshold_image("saturation")
self.threshold_image("value")
# Perform an AND on HSV components to identify the laser!
self.channels['laser'] = cv2.bitwise_and(
self.channels['hue'],
self.channels['value']
)
self.channels['laser'] = cv2.bitwise_and(
self.channels['saturation'],
self.channels['laser']
)
# Merge the HSV components back together.
hsv_image = cv2.merge([
self.channels['hue'],
self.channels['saturation'],
self.channels['value'],
])
thresh = cv2.threshold(self.channels['laser'], 25, 255, cv2.THRESH_BINARY)[1]
#find contours in the mask and initialize the current
#(x, y) center of the ball
#cnts = cv2.findContours(self.channels['laser'].copy(), cv2.RETR_EXTERNAL,
#cv2.CHAIN_APPROX_SIMPLE)
(_, cnts, _) = cv2.findContours(thresh.copy(), cv2.RETR_EXTERNAL,
cv2.CHAIN_APPROX_SIMPLE)
center = None
# only proceed if at least one contour was found
if len(cnts) > 0:
# find the largest contour in the mask, then use
# it to compute the minimum enclosing circle and
# centroid
c = max(cnts, key=cv2.contourArea)
((x, y), radius) = cv2.minEnclosingCircle(c)
M = cv2.moments(c)
center = (int(M["m10"] / M["m00"]), int(M["m01"] / M["m00"]))
# only proceed if the radius meets a minimum size
if radius > 10:
# draw the circle and centroid on the frame,
# then update the list of tracked points
cv2.circle(frame, (int(x), int(y)), int(radius),
(0, 255, 255), 2)
cv2.circle(frame, center, 5, (0, 0, 255), -1)
cv2.imshow('LaserPointer', self.channels['laser'])
################################################
return hsv_image
在“如果len(cnts)>0:”行中,我得到的cnts大于0,但在激光指针中看不到绘制的圆 还有另一个函数(display())显示激光帧(self.channel['laser']) 我从这个函数中注释掉了这些cv2.iamshow行,然后我可以看到激光指针周围的圆圈。这是因为现在执行了cv2.iamshow行内函数“detect(self,frame):”中的帧。然后我在指针上应用了进一步的编码来检测它的位置
def display(self, img, frame):
"""Display the combined image and (optionally) all other image channels
NOTE: default color space in OpenCV is BGR.
"""
cv2.imshow('RGB_VideoFrame', frame)
cv2.imshow('LaserPointer', self.channels['laser'])