The tag has no wiki summary.

learn more… | top users | synonyms

1
vote
1answer
92 views

Decomposition of **3D** structuring elements for morphological operations

I am struggling to implement a mathematical morphology toolset in an image processing package. I base my implementation on what I saw in MATLAB, and on several papers on the subject. There seems to ...
0
votes
1answer
69 views

Getting HRTF from 3-D scan + acoustic simulation

This question follows from Modelling propagation of sound wave by particle simulation This last fortnight I have started experimenting with Binaural audio; it really blows everything else out of the ...
2
votes
0answers
48 views

Upsampling Methods for Computed-Tomography

I have two sets of data of given Field of view, one of them only covers a subset of the FOV of the other. I therefore want to upsample the one with the larger FOV to combine it with the other one. So ...
1
vote
0answers
31 views

How to detect directional signal in three dimensions?

I have three orthogonal accelerometers that give accelerations in x,y and z dimensions. I'm trying to detect directional vibrations between certain frequencies. In other words, my input is 3d vector ...
1
vote
1answer
78 views

3d CT segmentation

It's my first attempt at 3D analysis. I am trying to segment a 3D CT data. My case study is very simple: trying to segment circular objects in my data. Do you have any suggestions on how to achieve ...
5
votes
2answers
297 views

Eigenvalues and eigenvectors of a 3D image Laplacian

I need to compute the eigenvalues and eigenvectors of a 3D image Laplacian. I'm trying to evaluate the heat kernel on the 3D uniform grid (the uniform structure generated by the voxelized image) at ...
0
votes
0answers
46 views

Meshes vs. Raw Point Clouds for 3D Object Recognition

I am trying to answer the question of whether it is better to use a raw point cloud or to mesh the point cloud prior to calculating local descriptors for the purpose of 3D object recognition in ...
4
votes
1answer
245 views

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 ...
1
vote
1answer
130 views

Properties of projected 3d points (to 2d), Principal component analysis (PCA)

This question is a little theoretical. Say I have 3 points that are bound within a certain 3D volume of some shape (i.e. box, cylinder, cone, etc). By using PCA, I find the most two dominant ...
1
vote
1answer
320 views

How to relocate face points in opencv / face distortion?

I have to simulate facial expressions on a face image ( say open mouth ). For this I first extracted the facial feature points and found the corners of the lips. Now I need to deform the image by ...
2
votes
1answer
460 views

Texture mapping on a 3D face from 2D face image

I have 3D points (xyz) of a face image and I have 2D face image of the same person. The 3D points of the face are such that If I project the points to 2D plane, it matches with the 2D face image. I ...
2
votes
0answers
57 views

Phong Reflection Model Parameters

Question: Can anyone refer me the Phong reflection model parameters for a face image taken for web-cam? Details: I am doing 3D reconstruction of 2D images using 3D Morphable Model as in this paper ...
3
votes
1answer
444 views

filling holes of a 3D image in Matlab

I want to use morphology operator for filling holes of a 3d image. The 3d image consists of 116 2-D image slices of the same size (512*512 pixels). I tried using imfill in Matlab for the 3d image but ...
0
votes
0answers
250 views

Using GavabDB for 3D face reconstruction from frontal image

Project: 3D face reconstruction Input: 2D frontal face Image Output: 3D face Reconstruction and expression simulation Platform: Matlab or Opencv cpp. I found out after study that 3D Morphable Models ...
0
votes
2answers
97 views

What is the procedure to obtain a 3D face dataset? Can anyone suggest a good 3D face dataset?

Project Description: Input: Frontal Face Image Expression Angle Size Details: I have to convert the input frontal face image into 3D face and simulate the ...
3
votes
1answer
172 views

Software to register a 2D image to a 3D volume

I have been searching for software that can handle the task of registering a 2D image to a 3D volume. The 3D volume is a microCT scan, while the 2D image is taken from a plane passing through the ...
8
votes
2answers
457 views

How to measure a lung nodule in a CT Scan DICOM image?

In this question, I would like to focus on intensity value of the CT Scan. First, take a look at the image below: The upper image is the original image, while the lower image is the thresholded ...
4
votes
2answers
665 views

Shortest geometric distance from surface in 3d dataset?

I have a three-dimensional binary image of a collection of discrete, individual voxels ("seeds") contained in a connected 3-dimensional surface ("skin"). (Like a small fruit, with a surface delineated ...
4
votes
3answers
101 views

What is temporal neighborhood?

I read in a paper http://tcts.fpms.ac.be/publications/regpapers/2011/nrmmbgtd_icvs_LNCS.pdf about spatio-temporal filters, which is applied to frames of the videos. I could not understand these terms ...
10
votes
1answer
155 views

Advise on detecting anatomical landmarks in a CT reconstructed volume

I'm trying to automatically detect some medical defined anatomical landmarks in a CT reconstructed volume. Medical doctors use these landmarks to measure some patient specific parameters. I have ...
8
votes
1answer
2k views

Analytical expression for the eigenvectors of a 3x3 real, symmetric matrix?

I am writing an algorithm that process 3D images based on the local moment of inertia. I have a 3x3 real symmetric matrix, from which I need to find the eigenvalues. I have found a variety of ...
7
votes
3answers
778 views

Camera calibration/pin hole camera model and working out 3d position

I have a calibrated camera and have the intrinsic parameters. I also have the extrinsic parameters relative to a point (the world origin) on a planar surface in the real world. This point I have set ...
5
votes
1answer
557 views

The fastest way to “fill holes” in 3D?

I have a 3D binary image that I must fill all of the holes in the image. "Fill holes 3D" in this case, is basically a 3D version of BW2 = imfill(BW,'holes') from ...
9
votes
2answers
135 views

Finding radius r of the overlappable sphere(s) in 3D image

My current problem: I have an input 3D binary image (a 3D matrix that has only 0 and 1) that consists of random numbers of sphere with radius r. We do not know how many spheres are there in the ...
10
votes
1answer
192 views

Image Processing method for spiky selection

I have an input as a 3D binary image and the preferred output below: Input: Preferred Output: What image processing methods should I look for if I am to have only the spiky object(s) remain, ...
6
votes
2answers
3k views

How to compute camera pose from Homography matrix?

Say I use only one calibrated camera. From this camera, I get images A and B. I know the homography between A and B, computed through OpenCV's findHomography(). I know the pose (rotation matrix R and ...
5
votes
2answers
138 views

I'm looking to do my senior capstone project in the field of medical tomography, what is a good book to get acquainted with the field?

I'm a junior currently pursuing a mathematics degree with aspirations toward medical school. I have a senior project I have my entire last year to devote time to, and I've decided that I want to ...
2
votes
1answer
94 views

Tools for 3D shape analysis

I have a 3D shape in a 3D binary image. Therefore, I have a list of all of the x,y,z points. If I am to analyze this shape for various identification, such as "sphericity", volume, surface area, etc., ...
21
votes
3answers
622 views

How can I reconstruct a 3D structure from a set of images?

I have a set of contours (set of line segments) grouped in the following way: $S_i = \{I^0, I^\frac{\pi}{4}, I^\frac{2\pi}{4}, \ldots, I^\frac{7\pi}{4} \}$ where $S_i$ denote sequence of photos of ...