Questions tagged [image-registration]
Image registration is the process of transforming different sets of images to one common coordinate system.
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Phase Correlation with Mask for Translation-Invariant Log-Polar Registration
At the moment, I have implemented a registration method utilizing the mask in the log-polar domain, which consists of the below steps:
Algorithm 1
Transfer Image, Template, and Mask into Log-Polar ...
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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). ...
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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 ...
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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 ...
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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, ...
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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 ...
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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:
(...
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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 ...
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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\|} - \...
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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?
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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 ...
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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 ...
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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 ...
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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
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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):
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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 ...
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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 ...
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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 ...
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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/...
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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 ...
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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 ...
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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 ...
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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-...
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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 ...
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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 ...
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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 ...
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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 ...
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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:
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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How to blend images on a spherical surface / cube map
I already have an algorithm for making panoramic image mosaics by image registration and then blending images in the overlap regions.
The following image from Wikipedia illustrates several images ...
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Normalized cross correlation via FHT - how can I get correlation score?
I'm using the 2D Fast Hartley Transform to do fast correlation of two images in the frequency domain, which is the equivalent of NCC (normalized cross correlation) in the spatial domain.
However, ...
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image correlation without fft
I want to stitch 2 images by crosscorrelation measure, but I don't want to use fft.
I tryed this but something seems to be wrong.any suggestions?
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