我想在OpenCV中打開一個視頻源文件進行處理。我下面的教程這裏給出:http://docs.opencv.org/trunk/doc/py_tutorials/py_video/py_lucas_kanade/py_lucas_kanade.html#lucas-kanadeOpenCV灰度轉換錯誤
每次我試圖打開要處理我收到以下錯誤.AVI視頻文件:
Traceback (most recent call last):
File "C:\Users\Adam\Desktop\LastProjectAI\sources\samples\python2\lines.py", line 22, in <module>
old_gray = cv2.cvtColor(old_frame, cv2.COLOR_BGR2GRAY)
error: ..\..\..\src\opencv\modules\imgproc\src\color.cpp:3402: error: (-215) scn == 3 || scn == 4
我從其他職位讀到這樣的錯誤當源視頻文件不是3或4個頻道時拋出。但是,我使用的是OpenCV教程提供的視頻,所以我不明白他們爲什麼不工作。
下面是完整的代碼,我有工作:
import numpy as np
import cv2
cap = cv2.VideoCapture('walking.avi')
# params for ShiTomasi corner detection
feature_params = dict(maxCorners = 100,
qualityLevel = 0.3,
minDistance = 7,
blockSize = 7)
# Parameters for lucas kanade optical flow
lk_params = dict(winSize = (15,15),
maxLevel = 2,
criteria = (cv2.TERM_CRITERIA_EPS | cv2.TERM_CRITERIA_COUNT, 10, 0.03))
# Create some random colors
color = np.random.randint(0,255,(100,3))
# Take first frame and find corners in it
ret, old_frame = cap.read()
old_gray = cv2.cvtColor(old_frame, cv2.COLOR_BGR2GRAY)
p0 = cv2.goodFeaturesToTrack(old_gray, mask = None, **feature_params)
# Create a mask image for drawing purposes
mask = np.zeros_like(old_frame)
while(1):
ret,frame = cap.read()
frame_gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
# calculate optical flow
p1, st, err = cv2.calcOpticalFlowPyrLK(old_gray, frame_gray, p0, None, **lk_params)
# Select good points
good_new = p1[st==1]
good_old = p0[st==1]
# draw the tracks
for i,(new,old) in enumerate(zip(good_new,good_old)):
a,b = new.ravel()
c,d = old.ravel()
mask = cv2.line(mask, (a,b),(c,d), color[i].tolist(), 2)
frame = cv2.circle(frame,(a,b),5,color[i].tolist(),-1)
img = cv2.add(frame,mask)
cv2.imshow('frame',img)
k = cv2.waitKey(30) & 0xff
if k == 27:
break
# Now update the previous frame and previous points
old_gray = frame_gray.copy()
p0 = good_new.reshape(-1,1,2)
cv2.destroyAllWindows()
cap.release()
下應注意:
- 我使用與Windows 8
- 視頻文件的Python編輯器IDLE我想要加載的是與Python文件直接相同的文件。
我試過多個視頻文件沒有運氣。有沒有人有任何建議去解決這個錯誤?
編輯:
我能證明它是從德視頻拍攝對象直接讀取後的幀。但是,如果我嘗試後的for循環其中提請軌道加載框架,我得到這個錯誤:
OpenCV Error: Bad flag (parameter or structure field) (Unrecognized or unsupported array type) in cvGetMat, file /build/buildd/opencv-2.4.5+dfsg/modules/core/src/array.cpp, line 2482
Traceback (most recent call last):
File "prac.py", line 55, in <module>
cv2.imshow('frame2', frame)
cv2.error: /build/buildd/opencv-2.4.5+dfsg/modules/core/src/array.cpp:2482: error: (-206) Unrecognized or unsupported array type in function cvGetMat
你正在使用哪個opencv版本? 在opencv 2.x cv2.line()和cv2.circle()返回空,所以只需從您的代碼中刪除「mask =」和「frame =」 –