homography

rotation and translation matrix from homography opencv

北城以北 提交于 2019-12-08 07:04:33
问题 I'm working on an android application in java,I calculated homography with opencv using findHomography(), how I can find the matrix of the camera pose containing the rotation and translation through homography Mat homography = Calib3d.findHomography(ReferencePoints2, ReferencePoints1,0,Calib3d.RANSAC); 回答1: You need to know the intrinsic parameters of the camera to do that. Considers the z=0 plane. The point X=(x,y,0,1)' is projected to the image as p=P*X. Now use the decomposition P=K[R t],

How to use OpenGL to emulate OpenCV's warpPerspective functionality (perspective transform)

社会主义新天地 提交于 2019-12-06 04:22:41
问题 I've done image warping using OpenCV in Python and C++, see the Coca Cola logo warped in place in the corners I had selected: Using the following images: and this: Full album with transition pics and description here I need to do exactly this, but in OpenGL. I'll have: Corners inside which I've to map the warped image A homography matrix that maps the transformation of the logo image into the logo image you see inside the final image (using OpenCV's warpPerspective), something like this: [[ 2

Getting the 5 points used by RANSAC in findHomography (OpenCV for Android)

别说谁变了你拦得住时间么 提交于 2019-12-06 02:23:17
In OpenCV for Android, the function org.opencv.Calib3d.findHomography(..) returns the homogeneous transformation matrix. For example, this only returns the homography: Mat homography = Calib3d.findHomography(points1, points2, Calib3d.RANSAC, 0.5); Is there a way to return the points that RANSAC

2D-3D homography matrix estimation

≡放荡痞女 提交于 2019-12-06 00:52:42
问题 I am working with my Kinect on some 2D 3D image processing. Here is my problem: I have points in 3D (x,y,z) which lie on a plane. I also know the coordinates of the points on the RGB image (x,y). Now I want to estimate a 2D-3D homography matrix to estimate the (x1,y1,z1) coordinates to a random (x1,y1) point. I think that is possible, but I don't know where to start. Thanks! 回答1: What you're looking for is a camera projection matrix, not a homography. A homography maps a plane seen from a

Find Homography matrix from Fundamental matrix

感情迁移 提交于 2019-12-05 03:44:29
问题 I'm trying to compute Homography matrix H given a set of correspondences and the Fundamental matrix F . From the principle of Epipolar geometry I know this can be done by cross product of epiline and F from Epipole Geometry [e_ij] x F_ij = H_ij I'm using OpenCV for finding Fundamental matrix F from set of matches between two views using cv::findFundamentalMat() . My question is that how can I find e_ij and how to use it in order to compute H . In OpenCV there is a function cv:

Having some difficulty in image stitching using OpenCV

大憨熊 提交于 2019-12-04 14:41:25
问题 I'm currently working on Image stitching using OpenCV 2.3.1 on Visual Studio 2010, but I'm having some trouble. Problem Description I'm trying to write a code for stitching multiple images derived from a few cameras(about 3~4), i,e, the code should keep executing image stitching until I ask it to stop. The following is what I've done so far: (For simplification, I'll replace some part of the code with just a few words) 1.Reading frames(images) from 2 cameras (Currently I'm just working on 2

Calculating homography matrix using arbitrary known geometrical relations

廉价感情. 提交于 2019-12-04 12:35:20
问题 I am using OpenCV for an optical measurement system. I need to carry out a perspective transformation between two images, captured by a digital camera. In the field of view of the camera I placed a set of markers (which lie in a common plane), which I use as corresponding points in both images. Using the markers' positions I can calculate the homography matrix. The problem is, that the measured object, whose images I actually want to transform is positioned in a small distance from the

How to use OpenGL to emulate OpenCV's warpPerspective functionality (perspective transform)

若如初见. 提交于 2019-12-04 10:48:59
I've done image warping using OpenCV in Python and C++, see the Coca Cola logo warped in place in the corners I had selected: Using the following images: and this: Full album with transition pics and description here I need to do exactly this, but in OpenGL. I'll have: Corners inside which I've to

How to estimate 2D similarity transformation (linear conformal, nonreflective similarity) in OpenCV?

故事扮演 提交于 2019-12-04 09:42:54
问题 I'm trying to search a specific object in input images by matching SIFT descriptors and finding the transformation matrix by RANSAC. The object can only be modified in scene by similarity transform in 2D space (scaled, rotated, translated), so I need to estimate 2x2 transform matrix instead of 3x3 homography matrix in 3D space. How can I achieve this in OpenCV? 回答1: You can use estimateRigidTransform (I do not know whether it is RANSAC, the code at http://code.opencv.org/projects/opencv

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