Questions tagged [correspondence]
39 questions
7
votes
1 answer
Can I reuse Homography matrix calculated from 2 different images of same scene taken by 2 different cameras?
I'm trying to learn OpenCV. I've a question regarding homography and epipolar geometry.
Suppose I've calculated homography using cvFindHomography() function using two static images' matched feature points taken with two cameras from two different…
mvr950
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4
votes
2 answers
Implementation of Absolute Differences Stereo Matching Algorithm
Good day!
I am trying to learn how to manually implement stereo matching algorithms. I'm basically starting with the most basic of them all - Absolute Difference.
I found some slides online that describe how to do it. Basically, from what I…
renzbagaporo
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4
votes
1 answer
Calculating corresponding pixels
I have a computer vision set up with two cameras. One of this cameras is a time of flight camera. It gives me the depth of the scene at every pixel. The other camera is standard camera giving me a colour image of the scene.
We would like to use the…
Janusz
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3
votes
0 answers
Comparison between Harris corner detector vs SURF
I am trying find the differences between two stereo images and I was doing some research. I came across Harris corner algorithm and SURF to solve the correspondence problem. I am unsure what the difference between the two are. Can someone explain to…
Micheal C.
- 101
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2
votes
1 answer
Numpy: Finding correspondences of 2D Array in another 2D array, without taking order in account
I have two numpy matrices with with different shapes:
vertices = np.array([[ 100, 101, 102, 103, -1],
[ 200, 201, 202, 203, 204],
[ 300, 301, 302, 303, 104],
[ 505, 506, 507, -1, …
Jean Jacquemier
- 161
- 11
2
votes
3 answers
Reconstructing 3D locations of corresponding points
I'm working on a project where I would like to reconstruct the 3D locations of
feature points I've extracted from my camera images. The idea is to:
Make a camera recording (Greyscale information, VGA size: 640 x 480)
Extract feature points in the…
Xilconic
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2
votes
2 answers
SQL WHERE IN with Left Join is not returning all rows I expect
I'm building a little conjugation/radicalization app, and I have stumbled upon a problem. I have this SQL request:
SELECT DISTINCT RA.*
FROM radical RA
left join conjugated CO
on CO.word_id = RA.id
where CO.conjugation IN…
Jo Colina
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2
votes
1 answer
Can't run correspondence analysis on two-way contingency table using FactoMineR
It does not appear to work on this table, named mytable:
0 1 2 3 4 5 7
Click_No 242854 91661 102 21 65 51 291
Click_Yes 48274 20785 14 2 19 4 146
However, it…
iuppiter
- 171
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- 7
2
votes
1 answer
Merging dataframes using a correspondence table using R
I would like to write a function which merges two dataframes (mydf1 and mydf2) according to a correspondence table (mykeys). Consider the following…
goclem
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2
votes
3 answers
Stereo system - Get 3d position usind OpenCv
I have a stereo system with 2 cameras. I calibrated these cameras. I try to calculate distance between each fingertip.On left image, I find fingertips using convex hull. I calculate epipoolar line for these points.I draw epipolar lines on right…
zakjma
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2
votes
1 answer
Putative correspondences
I am trying to implement the algorithm for estimating the fundamental matrix between two images using RANSAC. So far I have found the interest points using Harris corner detection. I am stuck at computing the putative correspondences using these…
user3178756
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1
vote
2 answers
Algorithm: 2D transformation, find outlying pairs of points and omit
I am looking for the following type of algorithm:
There are n matched pairs of points in 2D. How can I identify outlying pairs of points according to Affine / Helmert transformation and omit them from the transformation key? We do not know the…
justik
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1
vote
1 answer
Correspondence between character columns
I have a dataframe with five character columns. Each column has a limited number of values (categorical data). In the dataset, each value in one column occurs a variable number of times with a the other values in the other columns.
Here is an…
djourd1
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1
vote
2 answers
How to find the right point correspondance between template and a rotated image?
I have a .dxf file containing a drawing (template) which is just a piece with holes, from said drawing I successfully extract the coordinates of the holes and their diameters given in a list [[x1,y1,d1],[x2,y2,d2]...[xn,yn,dn]].
After this, I take a…
1
vote
2 answers
Find value corresponding to maximum in other column
I have a data frame similar to as follows:
x <- c(1, 2, 3, 4, 5)
y <- c(1, 2, 3, 2, 1)
df <- data.frame(x, y)
I want to find the value of x when y is at its maximum. I know that I can find the max of y with this:
max(df$y)
But I don't know how to…
Marco Pastor Mayo
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