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Questions tagged [image-registration]

Combine 2 images for the same scene taken by different model to get a more informative image. The first step of image registration is finding a correlation between images (fix and floating) by detecting image features, intensity value or combine them. Image similarity is a cost function and it should calculate iteratively while doing a transformation. Once we reach the optimal solution the optimization process suspends and the images will align based on best fit transformation parameters.

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How to interpret the OpenCV warp matrix?

I am using the function findTransformECC for automatic image alignment. I am only correcting for a shift so I use the warp mode MOTION_TRANSLATION. Image alignment works perfectly with cv2.warpAffine. Next thing I would like to do is to use the…
Wilmar van Ommeren
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Mattes Mutual Info basic doubts on 3D image registration

1. Mattes Mutual Info Doubts In SimpleITK Mattes Mutual information is a similarity metric measure, is this a maximizing function or minimizing function? I have tried a 3D registration(image size : 480*480*60) with Metric Mattes Mutual Info metric…
Subhajit
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ITK-SNAP segmentation displays same intensity value even after registration

I'm using ITK-SNAP to compare the intensities of several Regions of Interest between several conditions. For some subjects, I need to realign one image to another by using the Registration tool. However, I noticed that the intensity values of a…
Pollux
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Image segmentation and registration using SimpleITK

I have some doubts regarding 3D image registration and segmentation: Load dicom images: In DCE-MRI there are 4000 slices and total 100 stacks, so 40 in each stack. How can I load them to a 4D array using GDCM simpleITK function Registration:…
Subhajit
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Dicom Registration - IPP and PS

I have two dicom files with the following Image Patient Position (IPP) and Pixel Spacing (PS) img1, has PS of 2mm IPP of (-256,-256,-128) img2 has PS of 2.5mm and IPP of (-206,-201,-128) For image restration / alignment, I understand I need to have…
Ash
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mislocated google-maps overlay

Although I have successfully deployed the Google Maps API, a new, larger area image is misplaced. To demonstrate the issue, I have taken the code from the example here and changed the API key, the corner and centre lat-longs and the image ONLY. You…
Paul Scorer
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What are steps used in a intensity-based registration

What are the steps in intensity-based registration? If I have a floating image matching to a stack of images (of which only one is the best match), what are the steps in registration? Why is medical image normally use intensity-based for…
Mohammad nagdawi
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how to convert insight itk image transformation matrix to the form used in imwarp in matlab

So I got this transformation matrix from itk-snap when I tried to register a stack of CT images to a stack of MRI images. T = 2.0523 -0.0277 0.1518 0 0.0123 2.0405 0.3059 0 -0.1249 -0.2292 1.5095 0 270.7916 …
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estimating 3D Affine transformation, what matrix to use

I want to estimate an affine transform given matches between a transformed img and a reference img (which came from a reference stack). Can I estimate a 3D affine transform given only the x,y coordinates of the transformed image and the x, y, z…
haxtar
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How to mathematically obtain camera trace path from video

I have an aerial video of some (approximately flat) view (no depth maps required). I want to obtain the shape of the ground path the camera center passed upon. The path does not have to be correct with correspondence to the worl'd north, or have any…
Gulzar
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How to extend an ITK class in Python?

SimpleITK provides easy to use Python interface. Can I extend the class from there? I need to solve a registration problem, which requires me to write my customized registration class, especially the similarity metric. How can I extend SimpleITK in…
pyan
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Calculating 3D affine transform and re-sampling a volume using that

I am trying to register two volumes(vol1 and vol2). The size of the vol1 is 40x40x24. The size of the vol2 is 64 x64x11. So far, I have extracted their features and then matched them. Now, I have a set of corresponding points in two volumes that is…
sara_123
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Alignment/Registration of Bone X-ray Images Using MATLAB

I have several x-ray images of the same bone taken at different times (during followups), approximately from the same angle of the camera plane compared with the bone surface plane. However, the angle, location and size of the bone in the images are…
Noga
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Fast computation of joint histogram of two images

In the context of image registration, I have to compute the joint histogram of two images i.e. each histogram(i,j) contains the number of pixels whose intensity is i in the first image and j in the second one. To do this I loop on the…
neon29
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MATLAB isosurface vertices coordinates correspondence with volume

I've got a question regarding the isosurface function of MATLAB. Let's say I've got a mask (a bw volume) representing object A, and a surface (vertices and faces) representing object B. We know that object A and object B are different…
user1384636
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