Newest 'image-registration' Questions

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Optimal fiducial marker design for signal registration

I have scalar, time series data being produced by a set of measurement devices. For simplicity, assume that all the devices operate at the same sampling frequency (I can always interpolate if not). ...

asked Aug 11 at 20:15

RedPanda

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Using Scipy.correlate2d output matrix to determine best image match

I'm struggling to wrap my head around how I can use the output of a correlation matrix to determine if my image is present. If I am trying to match characters, how can I compare the outputs of these ...

image-processing scipy image-registration

asked Apr 11 at 19:21

Jeremy

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Image registration / alignment using on iOS and Android (using C#/Xamarin)

I'm trying to align two images of a the same scene that are taken with different cameras - identifying what the scaling factor is that should be applied to one of the images to align them as closely ...

image-registration c#

asked Apr 2 at 11:14

Oliver Spencer

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Does this Lucas-Kanade registration MATLAB script appear to be correct?

I'm currently writing a MATLAB script to replicate the Lucas-Kanade registration algorithm discussed here: https://cecas.clemson.edu/~stb/klt/lucas_bruce_d_1981_1.pdf Specifically, I'm attempting to ...

image-processing image-registration

asked Mar 29 at 0:13

Izzo

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Numerical computation of the derivative of a curve valued in $\operatorname{Diff}(\mathbb{R}^2)$

Assume we have a (discretized) sufficiently smooth curve $\alpha : [0, 1] \to \operatorname{Diff}(\mathbb{R}^2)$. Further assume that this curve is generated via a large deformation diffeomorphic ...

computer-vision image-registration finite-differences

asked Dec 14 '20 at 20:40

gian

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Registration of segemented medical images

I’m looking to register images based on probability maps (or possibly the binary images) resulting from segmentation of medical images of blood vessels with a circular FOV using python. Are there any ...

image-processing python image-registration reference-implementation

asked Oct 30 '20 at 22:04

JustAnotherUser

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Calculation of eigendecomposition of a signal in its Fourier domain?

I want to find the eigendecomposition of a 3-dimensional discretely sampled signal $X$, where each sample $X_{i,j,k}$ is treated as a vector $\langle i, j, k\rangle$ (with the origin at the middle of ...

fourier-transform convolution autocorrelation image-registration eigendecomposition

asked Oct 21 '20 at 3:02

Luke Hutchison

1457 bronze badges

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1answer

77 views

Derivative of mutual information in EMMA algorithm for image alignment

This question refers to the paper 'Alignment by Maximization of Mutual Information' by Paul Viola and William M. Wells III, published by International Journal of Computer Vision, 24(2) pg 137–154, ...

image-registration

asked May 30 '20 at 11:34

Amey Joshi

1033 bronze badges

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1answer

112 views

Whats the difference between spatial and temporal resolution?

Iam trying to understand how super-resolution works. But i think i have not understood correctly the difference between the optical resolution (spatial resolution?) and the resolution i know from a ...

sampling nyquist image-registration superresolution

asked Apr 11 '20 at 14:07

Khan

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votes

2answers

103 views

Digital Image Processing Textbook with Specific Topics

I am looking for a Digital Image Processing and analysis textbook, but there are specific topics that I would like the book to cover. Among other topics, I would like it to include a discussion of: (...

image-processing image reference-request image-registration books

asked Aug 5 '19 at 21:07

AaronJPung

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82 views

Understanding performance of Lucas Kanade Iterative Image Registration Technique

I am reading the paper: Lucas, B. D., & Kanade, T. (1981). An iterative image registration technique with an application to stereo vision. I am having some trouble understanding section 4.3 ...

image-processing computer-vision image-registration tracking

asked Apr 17 '19 at 20:37

skr_robo

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1answer

124 views

What does "invariant to bias and gain changes" mean?

Reading this paper, about the ECC criterion (which is included in opencv3), In section 3, the following is stated, with regard to the following equation: (4) $\left\|\frac{i_r}{\left\|i_r\right\|} - \...

image-processing image-registration panorama ecc

asked Feb 23 '19 at 15:16

Gulzar

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1answer

90 views

Homography for (small baseline) Stereo Image Registration

If the distance between two stereo cameras (baseline) is much smaller than the distance to the geometry, is it possible to align the resulting two stereo images using a homography?

image-registration homography

asked Jan 30 '19 at 12:19

cvNerd

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31 views

Does Mutual information utilize spatial information to calculate image similarity?

To calculate images similarity based on Mutual Information (MI), histogram and join histogram is required. In the literature, there are 2 contradict opinions about MI operation. 1. MI does not utilize ...

image-processing information-theory terminology image-registration

asked Aug 7 '18 at 4:08

Mohammad nagdawi

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vote

1answer

97 views

Transforming Non-Uniformly Sampled Image onto Rectangular Grid

I have an image and associated latitude and longitude matrices. So I know the latitude and longitude of every pixel. However, due to the camera orientation, the image is skewed and thus the latitude ...

image-processing image-registration projection

asked Jul 17 '18 at 21:10

Stephen Hartzell

1655 bronze badges

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vote

1answer

448 views

Affine Transformation for matching 2D point sets

I have two sets of 18 corresponding 2D points. These coordinates represent the main joint points of a human body, describing the "human pose". I want to decide if these two poses are similar/have the ...

image-processing image-registration template-matching distance-metrics

asked Nov 14 '17 at 9:31

tuuttuut

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108 views

Obtaining Subpixel Resolution for Video Processing in Python

I am working on a video processing application to calculate distance between two points using opencv Specs : Linear Pixels - 1600. FOV - 100 mm Resolution per pixel using above data : 62 micron ...

image-processing python opencv image-registration superresolution

asked Nov 5 '17 at 19:08

Gaurang Deshpande

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1answer

1k views

Affine transformation without imwarp

I program function to calculate the overlap area between 2 images (which is called fixed and floating) after transformation but it takes much time and it's complex for me to combine more than one ...

image-processing matlab image image-registration

asked Aug 28 '17 at 7:55

Mohammad nagdawi

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61 views

Images similarity measure using j-divergence

I need to reproduce the result of Xu, Xiaocong, et al, 2016 paper . Mutual information code already was done and work fine. can anyone help me to write Jeffrey’s divergence code? because the I use ...

image-processing image-registration

asked Aug 13 '17 at 8:01

Mohammad nagdawi

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100 views

Estimating exterior camera parameters by matching lines using least square estimations (Lowe, 1991)

I'm new to computer vision and graphics. I want to estimate exterior camera parameters using non-linear least square estimation as suggested by "Lowe, David G. "Fitting parameterized three-dimensional ...

image-processing computer-vision 3d image-registration camera-calibration

asked May 18 '17 at 5:31

Debaditya

1032 bronze badges

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1answer

528 views

Finding the four corners of each quadrilateral shapes in an image

I am working on some image processing application using Matlab. The image after segmentation will look (more or less) like the figure below. Now I want to find the four corners of each shape to crop ...

image-processing computer-vision image-segmentation image-registration

asked Apr 13 '17 at 2:53

user84310

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vote

1answer

329 views

Parallel Processing Gigapixel Images

Parallel programming is often used to accelerate image processing methods (e.g. Eklund et al., 2013); however, there doesn't appear to be the same level of discussion about using parallel processing ...

image-processing image image-registration

asked Mar 20 '17 at 23:41

user27402

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1answer

603 views

Estimates sub-pixel shift directly in phase region

I try to estimates shift estimation directly in phase region, by following the proposed method in this Sub-pixel Shift Estimation of Image based on the Least Squares Approximation in Phase Region by ...

image-processing matlab estimation image-registration

asked Mar 13 '17 at 2:29

Gregor Isack

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46 views

Get slopes of integer shift of an image in radians

I tried to reproduce the result from this paper, However I'm stuck at the Section III of the paper which involve integer shift. Two images which their phase correlation $\theta(k_1,k_2)$ was ...

image-processing matlab estimation image-registration motion

asked Mar 11 '17 at 13:57

Gregor Isack

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2

votes

1answer

656 views

Estimating scaling and translation between two consecutive temporal images

I have two camera images taken from a camera mounted over a vehicle at time $t$ and $t+1$. I need to estimate the scaling and translation in the images in spatial domain itself so that information ...

image-processing image image-registration

asked Feb 17 '17 at 4:57

Sukuya

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1answer

139 views

How is "Joint class histogram" algorithm deploy using Matlab?

Image registration and image retrieval depend on image similarity measure to find mutual information between 2 images. Using histogram, joint histogram, and joint class histogram we can find the ...

image-registration reference-implementation

asked Dec 4 '16 at 1:25

Mohammad nagdawi

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vote

1answer

166 views

Using Local Binary Pattern for finding Homography between two Image

Can LBP be used to find the homography between two images with similar field of view for Image Registration?

image-processing local-features image-registration

asked Nov 22 '16 at 4:03

krishnakumar

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votes

2answers

716 views

How can we combine 2D image with 3D image for the same sense?

We have 3D point cloud data captured by a laser scanner and need to register it with 2D images to get further information. In our case, the 2D image and 3D points are not overlapping and therefore we ...

image-processing computer-vision 3d image-registration camera-calibration

asked Oct 22 '16 at 2:20

Mohammad nagdawi

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3

votes

1answer

626 views

Best way of segmenting veins from arm?

I have done fews researches and found out approach such as multiscale and region growing, that could be used of extracting forearm veins. However, I tried to use frangi filter and Figure 1 is the ...

image-processing image image-segmentation image-registration

asked Aug 26 '16 at 8:53

Anthony Goh

313 bronze badges

3

votes

2answers

3k views

Practical advices for applying phase correlation in image registration task

I'm using OpenCV to detect shift between 2 images, here is sample code (based on cv::phaseCorrelate function): ...

fourier-transform opencv phase correlation image-registration

asked Jul 5 '16 at 12:27

mrgloom

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2

votes

1answer

123 views

Feature matching of images without corners

I am trying to stitch aerial images using feature-based registration. Most image pairs are matched well, such as this: Others are not matched due to lack of common features: As you can see, the ...

local-features image-registration template-matching stitching

asked Jun 10 '16 at 11:55

Libor

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votes

1answer

95 views

Automatic landmarks on images of hands

Problem statement I am starting a project soon where I need to create a method to automatically create landmarks on a set of images of human hands. I do not have a sample image but the images are ...

image-processing image-segmentation image-registration

asked Apr 2 '16 at 15:21

Gumeo

1154 bronze badges

3

votes

1answer

3k views

How to achieve image straightening as cam scanner does?

Is it possible to achieve image straightening as cam scanner does I mean selecting a non-rectangular region and converting it to a rectangular region as an image. I can only do re sizing and crop of ...

image-processing image image-registration

asked Mar 14 '16 at 7:51

ANUJ SINGH

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1answer

446 views

Are there any template matching / optical flow algorithms for large image displacement?

I had some success with feature-based methods for image registration, but these methods are sometimes unsuitable (e.g. images containing repetitive patterns, very low contrast, low texture, no edges/...

image-registration template-matching

asked Dec 19 '15 at 23:14

Libor

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votes

2answers

904 views

Is there a difference between Image Alignment and Stereo Rectification for stereo correspondence or matching?

As far as I know, Image alignment just finds the best fit given two images of the same scene. Whereas Image rectification, with regards to stereo vision, warps the images so that the epipolar lines ...

image-processing image image-registration terminology stereo-vision

asked Sep 23 '15 at 6:13

Grim

916 bronze badges

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0answers

270 views

Image registration dataset

I am searching for global purpose Dataset to test some image registration algorithm.. May you please give advice? I am looking for color or gray-scale dataset. I prefer it not to be medical or ...

image-registration data-request

asked Sep 21 '15 at 14:10

Humam Helfawi

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vote

1answer

932 views

Camera calibration vs. registration

Suppose I have two cameras, c1 and c2 that are securely installed and do not move. What I want is a matrix T, that takes a pixel of an image from camera c1 and calculates the according pixel in an ...

camera image-registration camera-calibration camera-pose

asked Jul 28 '15 at 13:02

user1809923

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2

votes

1answer

263 views

Image Registration

I am trying to register two images of daily objects from different viewpoints (5 to 20 degrees angle). I have been reading about image registration and I feel like the best way to go is using Feature-...

image-processing matlab image-registration

asked Jul 8 '15 at 16:51

Güngör Basa

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0answers

77 views

Understand about registration between spatial prior and original image

I am working in level set/active contour method using spatial prior information . The main papers that I am focusing:"Automatic segmentation of neonatal images using convex optimization and coupled ...

image-processing computer-vision image-segmentation image-registration

asked Jul 7 '15 at 10:30

John

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vote

1answer

107 views

mathematical transfer for different camera attributes

Suppose I have two camera shoots(Image1,Image2) for the exactly same scene (each pixel is alignment correctly) but from different cameras and different light conditions. I want to remove this light ...

image-processing opencv image-registration

asked Jun 9 '15 at 12:22

Humam Helfawi

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3

votes

2answers

164 views

Transformation of coordinate set

I have a problem in which i have a video that was taken from the side of the subject, something like this and i need to transform the coordinates of the subject to be as if the photo was taken from ...

image-processing image transfer-function image-registration

asked Mar 9 '15 at 9:11

Kozolovska

1334 bronze badges

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vote

2answers

672 views

How to transform or distort or skew a rectangular image to fit arbitrary quad

I have a rectangular image which need to transform so the image fits an arbitrary convex quad. Easy? Except I have an important constraint, the features on the original image must maintain their ...

image-processing transform image-registration

asked Jan 23 '15 at 18:25

Ken

1194 bronze badges

4

votes

1answer

272 views

Image registration / fusion optimal similarity metrics

I have a theoretical question about optimal similarity metrics for comparing data sets. In reading this linked paper, pp. 488-489 [1], I read the following 2 interesting statements. On page 488: ...

image-processing correlation information-theory image-registration distance-metrics

asked Jan 17 '15 at 10:29

sambajetson

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vote

2answers

158 views

How does 3D Time-of-Flight (TOF) camera work?

This is my first post in this forum! So Point me if anything is not clear! I want to know how TOF camera works? So I've done Google & read some nice explanation about How Phase difference between ...

image signal-detection camera image-registration

asked Dec 17 '14 at 13:33

Balaji R

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2answers

188 views

Background Removal and Object Tracking - Track Fish Jumping Out of the Water

0 down vote favorite I am totally new to Image processing. I just started my Master thesis in the area of Computer vision and Machine learning. My background is Informatics. Now, my first task is to ...

image-processing computer-vision image image-segmentation image-registration

asked Jun 4 '14 at 10:31

user3706505

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2

votes

2answers

1k views

What exactly do we do in non-rigid registration?

I found many readings on Non rigid registration, also saw some videos but didn't find a clear explanation anywhere. What I understood is the following Rigid ...

image-registration point-cloud

asked May 9 '14 at 13:46

Shashwat

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vote

0answers

1k views

Image Registration C#

I'm trying to fuse different images of the same scene which each image have a different focus. I've been told that first I have to perform an image registration to the images. Right now, the result ...

image-processing c# image-registration

asked May 5 '14 at 15:34

Elior

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3

votes

0answers

168 views

Detecting blades of a wind turbine

I have many close-range images of a single wind turbine blade (taken from different positions, same angle): I need to separate the blade image from background like this: The problem arises in image ...

edge-detection image-registration background-subtraction stitching

asked Mar 21 '14 at 9:07

Libor

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4

votes

1answer

3k views

Base line detection of text lines

I came across various works in the literature of document analysis addressing the problem of detecting base lines in multi-oriented texts. But no amount of search could give me satisfactory answer to ...

image-processing computer-vision image-registration text-recognition

asked Feb 8 '14 at 17:23

Dib

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votes

1answer

2k views

Image Registration and optical flow

Image registration algorithms can be classified into intensity-based and feature-based algorithms, I want to know When and Why should i choose intensity or feature based algorithm? another question ...

image-processing image image-registration motion-detection optical-flow

asked Oct 9 '13 at 21:10

HforHesham

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