homography Questions
1
Solved
I'm trying to build static augmented reality scene over a photo with 4 defined correspondences between coplanar points on a plane and image.
Here is a step by step flow:
User adds an image usin...
Diderot asked 16/5, 2017 at 17:30
2
Solved
I'm working with a homography calculated by OpenCV. I currently use this homography to transform points using the function below. This function performs the task I require however I have no clue ho...
Pallium asked 14/2, 2012 at 10:50
1
Solved
I have a homgraphy matrix
[h1 h2 h3
h4 h5 h6
h7 h8 h9]
I have transformed a point
p1 to P1 using above homography matrix.
Similarly
p2 to P2
p3 to P3
p4 to P4
I know the diffence betw...
Yellow asked 10/2, 2017 at 6:21
2
Solved
This question was already asked, but I still don't get it. I obtain a homography matrix by calling cv::findHomography from a set of points. I need to check whether it's relevant or not.The proposed...
Tiernan asked 19/2, 2013 at 9:37
1
Solved
Can someone show me how to apply RANSAC to find the best 4 feature matching points and their corresponding (x,y) coordinate so I can use them in my homography code?
The feature matching points wer...
Dinse asked 20/7, 2016 at 22:33
0
I want to transform a curved, rectangular label on a bottle to the normalized form with OpenCV.
I know:
the edge points of the label
the contour as points of the label
the template rectangle si...
Peterpeterborough asked 29/4, 2016 at 16:37
1
Okay so i am trying to find homography of a soccer match. What i have till now is
Read images from a folder which is basically many cropped images of a template soccer field. Basically this has i...
Walrus asked 11/4, 2016 at 6:27
2
Solved
I've two pictures (A and B) slightly distorted one from the other, where there are translation, rotation and scale differences between them (for example, these pictures:)
Ssoooooooo what I ne...
Asphyxiate asked 26/11, 2012 at 17:36
0
In my application:
I track an object.
Get where its corners are coming in this frame.
I find the homography between its corners from last frame and
current frame.
Use that homography to do a pers...
Regale asked 1/10, 2015 at 6:32
2
Solved
I want to convert an image using control points according to this scheme extracted from here:
A and B contains the coordinates of the source an target vertices.
I am computing the transformatio...
Benetta asked 28/8, 2015 at 8:17
2
As I know, Homography (projective transformation) in computer vision can be used to detect object in images but all the examples, I've seen, were on planar objects. Does Homography only work on a p...
Braddy asked 4/6, 2015 at 14:1
1
Solved
As known, in OpenCV I can get affine or perspective transformation between 2 images:
M - affine transformation - by using estimateRigidTransform()
H - perspective (homography) transformation - by...
Discord asked 20/4, 2015 at 13:30
3
Solved
This might have been answered but I desperately need an answer for this. I want to find the largest square or rectangle in an image using OpenCV in Android. All of the solutions that I found are C+...
Valida asked 7/7, 2013 at 12:41
1
Solved
in order to get a homography between two images, I wanted to know how many points I need at least to get a good estimation of the homography matrix?
Nomenclature asked 15/7, 2014 at 0:54
1
When finding a reference image in a scene using SURF, I would like to crop the found object in the scene, and "straighten" it back using warpPerspective and the reversed homography matrix...
Matusow asked 16/5, 2013 at 12:19
2
Solved
I've a calibrated camera where I exactly know the intrinsic and extrinsic data. Also the height of the camera is known. Now I want to virtually rotate the camera for getting a Bird's eye view, such...
Mccormac asked 7/7, 2011 at 6:49
3
Solved
The example in the link below is using findHomography to get the transformation between two sets of points. I want to limit the degrees of freedom used in the transformation so want to replace find...
Mccown asked 29/4, 2014 at 18:58
1
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...
Stowe asked 10/10, 2011 at 10:1
5
Solved
I am using to compile and run code from Features2D + Homography to find a known object tutorial, and I am getting this
OpenCV Error: Assertion failed (npoints >= 0 && points2.checkVecto...
Mahaliamahan asked 15/12, 2011 at 12:38
2
Solved
The findHomography() function in OpenCV finds a perspective transformation between two planes.The computed homography matrix is refined further (using inliers only in case of a robust method)...
Marge asked 27/12, 2012 at 6:22
2
Solved
I have 2 consecutive images from a camera and I want to estimate the change in camera pose:
I calculate the optical flow:
Const MAXFEATURES As Integer = 100
imgA = New Image(Of [Structure].Bgr, ...
Factory asked 12/9, 2011 at 13:44
3
Solved
I'm using findHomography on a list of points and sending the result to warpPerspective.
The problem is that sometimes the result is complete garbage and the resulting image is represented by weird...
Cutoff asked 10/6, 2012 at 21:17
1
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...
Polymorphism asked 12/7, 2013 at 12:59
3
I have two images that are taken from different positions. The 2nd camera is located to the right, up and backward with respect to 1st camera.
So I think there is a perspective transformation bet...
Forefinger asked 18/4, 2013 at 16:25
1
Solved
I calculate the homography matrix of an image using OpenCV's findHomography and then I warp the image using warpPerspective function. Now I want to use the same homography matrix for a scaled versi...
Turbulence asked 3/5, 2013 at 13:30
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