我正在尝试使用reprojectImageTo3D（）函数构造3d点云。我已经执行了以下步骤：stereoCalibrate（）-> stereoRectify（）->计算视差图-> reprojectImageTo3D.reprojectImageTo3D（）的输出在点云中给出了一个圆锥体，这不是所希望的，我也面临着获取准确的视差图时出现问题。获取视差图的分步过程是什么。下面是我的代码。请在错误的地方帮助我
import numpy as np
import cv2
import glob
from matplotlib import pyplot as plt
import sys
#get all frames from calibration video
calibcap = cv2.VideoCapture('testcut1.avi')
calib_files = []
if calibcap.isOpened() == False:
print('Error file not found!')
while calibcap.isOpened():
ret,frame = calibcap.read()
if ret == True:
#time.sleep(1/20)
cv2.imshow('frame',frame)
calib_files.append(frame)
if cv2.waitKey(10) & 0xFF == 27:
break
else:
break
calibcap.release()
#divide a frame into 2 images (left cam img and right cam img)
cam_left = []
cam_right = []
for fname in calib_files:
cam_left.append(fname[288:576,:360])
cam_right.append(fname[:288,360:720])
#print(len(cam_left))
#print(len(cam_right))
height, width, depth = cam_left[0].shape
print(cam_left[0].shape)
#cv2.imshow("leftcam", cam_left[0])
#cv2.imshow("righcam", cam_right[0])
#Declaring Object points array
objpleft = np.zeros((6*6,3),np.float32)
objpleft[:,:2] = np.mgrid[0:6,0:6].T.reshape(-1,2)
objpright = np.zeros((6*6,3),np.float32)
objpright[:,:2] = np.mgrid[0:6,0:6].T.reshape(-1,2)
#Termination Criteria
criteria = (cv2.TERM_CRITERIA_EPS + cv2.TERM_CRITERIA_MAX_ITER, 30, 0.001)
#Declaring variables for objectpoints and imagepoints
objectpoints = []
objectpointsleft = []
objectpointsright = []
imgpointsleft = []
imgpointsright = []
imagepointsl = []
#Finding Imagepoints and ObjectPoints of left camera
for fname in cam_left:
img = fname
gray = cv2.cvtColor(fname,cv2.COLOR_BGR2GRAY)
ret, corners = cv2.findChessboardCorners(gray, (6,6),None)
if ret == True:
objectpointsleft.append(objpleft)
corners1 = cv2.cornerSubPix(gray, corners, (11,11), (-1,-1), criteria)
imgpointsleft.append(corners1)
#Draw and Display Corners
img = cv2.drawChessboardCorners(img, (6,6), corners1, ret)
cv2.imshow("calibleft", img)
cv2.waitKey(500)
ret, mtxl, distl, rvecl, tvecl = cv2.calibrateCamera(objectpointsleft,imgpointsleft,(width,height),None,None)
print(mtxl)
print(distl)
objectpoints.append(objectpointsleft[0])
imagepointsl.append(imgpointsleft[0])
#Finding Image points and Object points for right Camera
for fnamee in cam_right:
img1 = fnamee
gray1 = cv2.cvtColor(fnamee,cv2.COLOR_BGR2GRAY)
ret1, corners2 = cv2.findChessboardCorners(gray1, (6,6),None)
if ret1 == True:
objectpointsright.append(objpright)
corners3 = cv2.cornerSubPix(gray1, corners2, (11,11), (-1,-1), criteria)
imgpointsright.append(corners3)
#Draw and Display Corners
img1 = cv2.drawChessboardCorners(img1, (6,6), corners3, ret1)
cv2.imshow("calibright", img1)
cv2.waitKey(500)
#ret, mtxr, distr, rvecr, tvecr = cv2.calibrateCamera(objectpointsright,imgpointsright,gray1.shape[::-1],None,None)
#print(mtxr)
#print(distr)
print("Now doing stereoCalib")
cameraMatrix1 = None
distCoeffs1 = None
cameraMatrix2 = None
distCoeffs2 = None
R = None
T = None
E = None
F = None
stereo_criteria = (cv2.TERM_CRITERIA_COUNT + cv2.TERM_CRITERIA_EPS, 1000, 1e-6)
retval, cameraMatrix1, distCoeffs1, cameraMatrix2, distCoeffs2, R, T, E, F = cv2.stereoCalibrate(objectpoints, imagepointsl, imgpointsright, None, None, None, None, (width,height), flags=0)
print(cameraMatrix1)
print(distCoeffs1)
print("Stereo Calibration Sucessful\n")
#Implementing Rectification
R1 = np.zeros(shape=(3,3))
R2 = np.zeros(shape=(3,3))
P1 = np.zeros(shape=(3,4))
P2 = np.zeros(shape=(3,4))
print("\nStereo Rectification started")
R1, R2, P1, P2, Q, roi1, roi2 = cv2.stereoRectify(cameraMatrix1, distCoeffs1, cameraMatrix2, distCoeffs2, (width, height), R, T, alpha=0)
print(Q)
leftMapX, leftMapY = cv2.initUndistortRectifyMap(cameraMatrix1, distCoeffs1, R1, P1, (width, height), cv2.CV_16SC2)
rightMapX, rightMapY = cv2.initUndistortRectifyMap(cameraMatrix2, distCoeffs2, R2, P2, (width, height), cv2.CV_16SC2)
distCoeffs1[0][4] = 0.0
distCoeffs2[0][4] = 0.0
newCamsL, roiL = cv2.getOptimalNewCameraMatrix(cameraMatrix = cameraMatrix1, distCoeffs = distCoeffs1, imageSize = (width,height), alpha = 0)
newCamsR, roiR = cv2.getOptimalNewCameraMatrix(cameraMatrix = cameraMatrix2, distCoeffs = distCoeffs2, imageSize = (width,height), alpha = 0)
print("Stereo Rectification Successful\n")
print(roi1)
print('\n///////////////////////////////////\n')
print(roiL)
#In the above code we have done the Calibration technique and found the Q matrix, which can be used for reprojectImageTo3D
#//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
#Now we will calculate the Disparity Map for a pair of Stereo Images and find their 3D co-ordinates using reprojectImageTo3D/triangulatePoints
dispcap = cv2.VideoCapture('stereo4.avi')
if dispcap.isOpened() == False:
print("Error in reading Video File")
ret, frame = dispcap.read()
if ret == True:
cv2.imshow("frame", frame)
temp = frame
imageLeft = temp[288:576,:360]
imageRight = temp[:288,360:720]
#imageLeft = cv2.imread('imgL.jpg')
#imageRight = cv2.imread('imgR.jpg')
cv2.imshow('Left Image', imageLeft)
cv2.imshow('Right Image', imageRight)
height, width, depth = imageLeft.shape
#rectImageLeft = cv2.remap(imageLeft, leftMapX, leftMapY, cv2.INTER_LINEAR)
#rectImageRight = cv2.remap(imageRight, rightMapX, rightMapY, cv2.INTER_LINEAR)
#cv2.imshow('Rectified Left', rectImageLeft)
#cv2.imshow('Rectified right', rectImageRight)
rectFramesL = cv2.undistort(imageLeft, cameraMatrix1, distCoeffs1, newCamsL)
rectFramesR = cv2.undistort(imageRight, cameraMatrix2, distCoeffs2, newCamsR)
cv2.imshow('Rectified Left 1', rectFramesL)
cv2.imshow('Rectified right 1', rectFramesR)
rectFramesLgray = cv2.cvtColor(rectFramesL, cv2.COLOR_BGR2GRAY)
rectFramesRgray = cv2.cvtColor(rectFramesR, cv2.COLOR_BGR2GRAY)
window_size = 3
min_disp = 0
max_disp = 16
num_disp = max_disp - min_disp
stereo = cv2.StereoSGBM_create(
minDisparity = min_disp,
numDisparities=num_disp,
blockSize=16,
P1=8 * 1 * window_size ** 2,
P2=32 * 1 * window_size ** 2,
disp12MaxDiff=1,
uniquenessRatio=10,
speckleWindowSize=0,
speckleRange=0,
)
output = stereo.compute(imageLeft, imageRight)
disparity = np.uint8(output)
cv2.imshow('Disparity Map', disparity)
point_cloud = cv2.reprojectImageTo3D(disparity, Q)
cv2.imshow('pointcloud', point_cloud)
cv2.waitKey(0)
cv2.destroyAllWindows()