homography Questions
5
Solved
Below is a python script that calculates the homography between two images and then map a desired point from one image to another
import cv2
import numpy as np
if __name__ == '__main__' :
# Re...
Depriest asked 2/7, 2020 at 11:53
2
Solved
I was making some experimentations with the OpenCV function cv2.warpPerspective when I decided to code it from scratch to better understand its pipeline. Though I followed (hopefully) every theoret...
Oudh asked 25/9, 2022 at 9:44
2
Solved
OpenCV => 3.2
Operating System / Platform => Windows 64 Bit
Compiler => Visual Studio 2015
I am currently working on my project which involves vehicle detection and tracking and estimating and o...
Johnsonian asked 22/5, 2017 at 4:23
2
Solved
I know that one can compute the homography matrix by using at least four correpondence points.
I was wondering if and how can I obtain a homography matrix if I already know the rotation and transl...
Repine asked 28/5, 2017 at 20:12
1
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I'm creating an application that uses manual calibration to align two images. I'm trying to align them almost pixel perfectly, so I'm not relying on automatic calibration as it did not work the bes...
Horrocks asked 22/12, 2022 at 21:45
3
Solved
With the method explained in CV - Extract differences between two images we can identify the differences between two aligned images.
How to do this with OpenCV when the camera angle (point of view)...
Astrix asked 28/5, 2021 at 9:24
7
Solved
I have 4 coplanar points in a video (or image) representing a quad (not necessarily a square or rectangle) and I would like to be able to display a virtual cube on top of them where the corners of ...
Cruel asked 19/1, 2012 at 14:30
3
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I'm detecting markers on images captured by my iPad. Because of that I want to calculate translations and rotations between them, I want to change change perspective on images these image, so it wo...
Antimacassar asked 30/10, 2013 at 23:25
2
Solved
I am trying to solve a plane2plane projection problem using the findHomography function found in the OpenCV library. As a toy example I have a set of points in R2, P, and a second set of points in ...
Component asked 11/3, 2016 at 13:56
6
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I am trying to calculate scale, rotation and translation between two consecutive frames of a video. So basically I matched keypoints and then used opencv function findHomography() to calculate the ...
Bludge asked 4/9, 2014 at 6:16
4
I am learning camera matrix stuff. I already known that I can get the homography of the camera (3*3 matrix) by using four points in a plane in object space. I want to know if we can get the homagra...
Duster asked 16/10, 2012 at 17:33
5
This question is on the OpenCV functions findHomography, getPerspectiveTransform & getAffineTransform
What is the difference between findHomography and getPerspectiveTransform?. My understand...
Frogmouth asked 28/6, 2012 at 4:8
1
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I am doing car tracking on a video. I am trying to determine how many meters it traveled.
I randomly pulled 7 points from a video frame. I made point1 as my origin
Then on the corresponding Googl...
Slocum asked 12/5, 2019 at 18:15
2
Solved
As I know, OpenCV uses RANSAC in order to solve the problem of findHomography and it returns some useful parameters like the homograph_mask.
However, if I want to estimate just 2D transformation ...
Sickert asked 15/10, 2015 at 6:23
0
Usually we use 4 points for correcting perspective of an image. How can we use more number of points to convert a very distorted edged rectangle into a straight rectangle in opencv. Basically I'm t...
Twirl asked 28/3, 2019 at 9:56
3
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 transiti...
Irreligion asked 8/10, 2015 at 14:27
2
I get an H matrix using findHomography function.
H = findHomography(points_src, points_dst);
Then, I use H with warpPerspective to get a perspective projection of the image
warpPerspective(im...
Kaceykachina asked 22/2, 2017 at 16:18
2
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I am trying to find the transformation matrix H so that i can multiply the (x,y) pixel coordinates and get the (x,y) real world coordinates. Here is my code:
import cv2
import numpy as np
from num...
Professionalize asked 16/6, 2017 at 0:13
2
Solved
I am using the function findHomography of OpenCV with the RANSAC method in order to find the homography that relates two images linked with a set of keypoints.
The main issue is that I haven't be...
Cyclamen asked 4/4, 2013 at 15:21
0
I am trying to perform perspective transformation with homography using the opencv-python package.
I have a background and foreground image and would like to perform perspective transform and stit...
Demotic asked 5/3, 2018 at 16:2
1
Solved
I have a panorama image, and a smaller image of buildings seen within that panorama image. What I want to do is recognise if the buildings in that smaller image are in that panorama image, and how ...
Cherilyncherilynn asked 11/1, 2018 at 11:27
2
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Say I have an image which I have obtained after applying a homography transformation H to some original image. The original image is not shown. The result of the homography H applied to the origina...
Doggish asked 27/12, 2017 at 10:18
2
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I'm trying to find the rotation and translation from Homography function. First I compute the corresponding feature points and using findHomography() I computed the Homography Matrix. Then, using d...
Nereus asked 13/11, 2017 at 12:6
1
Solved
I'm wanting to use orb detectors to draw a bounding box around a found image, similarly to the example here, which is using sift detectors: SIFT Refrence
The Linked example uses a FlannBasedMatche...
Florrieflorry asked 26/11, 2017 at 12:45
2
Solved
Hi i am a beginner in computer vision and i wish to know what exactly is the difference between a homography and affine tranformation, if you want to find the translation between two images which o...
Icono asked 3/3, 2017 at 14:21
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