我正在尝试模拟从标记中脱颖而出的图像。到目前为止,这是我的代码,它完成了图片中的操作。本质上,我只是想旋转图像以使其与棋盘正交。
如您所见,我使用代码来查找归一化方形图像和相应棋盘角之间的转换矩阵。然后我用warpPerspective
得到你看到的图像。我知道我可以使用来自的旋转向量solvePnP
来获得一个旋转矩阵,rodrigues()
但我不知道下一步是什么
def transformTheSurface(inputFrame):
ret, frameLeft = capleft.read()
capGray = cv2.cvtColor(frameLeft,cv2.COLOR_BGR2GRAY)
found, corners = cv2.findChessboardCorners(capGray, (5,4), None, cv2.CALIB_CB_NORMALIZE_IMAGE + cv2.CALIB_CB_ADAPTIVE_THRESH ) #,None,cv2.CALIB_CB_FAST_CHECK)
if (found):
npGameFrame = pygame.surfarray.array3d(inputFrame)
inputFrameGray = cv2.cvtColor(npGameFrame,cv2.COLOR_BGR2GRAY)
cv2.drawChessboardCorners(frameLeft, (5,4), corners, found)
q = corners[[0, 4, 15, 19]]
ret, rvecs, tvecs = cv2.solvePnP(objp, corners, mtx, dist)
ptMatrix = cv2.getPerspectiveTransform( muffinCoords, q)
npGameFrame = cv2.flip(npGameFrame, 0)
ptMatrixWithXRot = ptMatrix * rodRotMat[0]
#inputFrameConv = cv2.cvtColor(npGameFrame,cv2.COLOR_BGRA2GRAY)
transMuffin = cv2.warpPerspective(npGameFrame, ptMatrix, (640, 480)) #, muffinImg, cv2.INTER_NEAREST, cv2.BORDER_CONSTANT, 0)
编辑:
我添加了更多代码,希望创建自己的 3x3 转换矩阵。我使用了以下参考。这是我的代码:
#initialization happens earlier in code
muffinCoords = np.zeros((4,2), np.float32)
muffinCoords[0] = (0,0)
muffinCoords[1] = (200,0)
muffinCoords[2] = (0,200)
muffinCoords[3] = (200,200)
A1 = np.zeros((4,3), np.float32)
A1[0] = (1,0,322)
A1[1] = (0,1,203)
A1[2] = (0,0,0)
A1[3] = (0,0,1)
R = np.zeros((4,4), np.float32)
R[3,3] = 1.0
T = np.zeros((4,4), np.float32)
T[0] = (1,0,0,0)
T[1] = (0,1,0,0)
T[2] = (0,0,1,0)
T[3] = (0,0,0,1)
#end initialization
#load calib data derived using cv2.calibrateCamera, my Fx and Fy are about 800
loadedCalibFileMTX = np.load('calibDataMTX.npy')
mtx = np.zeros((3,4), np.float32)
mtx[:3,:3] = loadedCalibFileMTX
#this is new to my code, creating what I interpret as Rx*Ry*Rz
ret, rvecCalc, tvecs = cv2.solvePnP(objp, corners, loadedCalibFileMTX, dist)
rodRotMat = cv2.Rodrigues(rvecCalc)
R[:3,:3] = rodRotMat[0]
#then I create T
T[0,3] = tvecs[0]
T[1,3] = tvecs[1]
T[2,3] = tvecs[2]
# CREATING CUSTOM TRANSFORM MATRIX
# A1 -> 2d to 3d projection matrix
# R-> rotation matrix as calculated by solve PnP, or Rx * Ry * Rz
# T -> converted translation matrix, reference from site, vectors pulled from tvecs of solvPnP
# mtx -> 3d to 2d matrix
# customTransformMat = mtx * (T * (R * A1)) {this is intended calculation of following}
first = np.dot(R, A1)
second = np.dot(T, first)
finalCalc = np.dot(mtx, second)
finalNorm = finalCalc/(finalCalc[2,2]) # to make sure that the [2,2] element is 1
transMuffin = cv2.warpPerspective(npGameFrame, finalNorm, (640, 480), None, cv2.INTER_NEAREST, cv2.BORDER_CONSTANT, 0)
#transMuffin is returned as undefined here, any help?
# using the cv2.getPerspectiveTransform method to find what you can find pictured at the top
ptMatrix = cv2.getPerspectiveTransform( muffinCoords, q)