16 questions
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Creating 3d object from RGBD and normal maps
I have RGBD and normal map and I want to reconstruct a 3d object from those maps - I found a link that helps create point cloud from RGBD map ( https://medium.com/yodayoda/from-depth-map-to-point-...
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48
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problem with GSAFT (backprojection) algorithm for nearfield image reconstruction on my simple planar array
I have a planar array containing 16 transmitters and 88 receivers located on the same plane with dimension 30cm-by-30cm. I have an object of size 6cm-by-6cm. Object and antenna array plane are in ...
- 352
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43
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How to reconstruct MMW image using electrical field in each direction at Reciever points
I have used a structure including 109 Receivers and 4 transmitters in order to do MMW imaging(multistatic imaging). Imaging was done in 3 different frequencies. So, now I have electrical field in each ...
- 352
4
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1
answer
5k
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Implementing a filtered backprojection algorithm using the central slice theorem in Matlab
I'm working on a filtered back projection algorithm using the central slice theorem for a homework assignment and while I understand the theory on paper, I've run into an issue implementing it in ...
- 135
6
votes
1
answer
7k
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Save tensors as images in TensorFlow
This might be a simple question. I am just trying to do radon transform of an image and save it using functions in TensorFlow. But the result is not right. I know I can use plt.imsave() to save the ...
- 393
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1k
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Filtered BackProjection Matlab
I have already implemented the code for BackProjection and it works.
Now I have to implement the code for the filtered version, using first ramlak filter and then hamming window.
My sinogram has ...
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491
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Implementation of Landweber iteration for dynamic Radon Transform in MATLAB
I am working on Dynamic Inverse Problems and Radon transforms. By the term "Dynamic," I mean the object (which eventually I am going to reconstruct its image by having the its measurements), deforms ...
1
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2
answers
793
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MeanShift formula understanding
I'm implementing MeanShift algorithm for object tracking, using ideas from here: http://www.cse.psu.edu/~rtc12/CSE598C/meanShiftColor.pdf
Now I have backprojection image for consequent frame. Each ...
- 2,262
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1
answer
755
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Why iradon returns negative pixel values?
I took 200 projections at a step angle of 1.8 degrees using LabVIEW software. The size of the image is 2748 x 2748 pixels, uint16. Then using Matlab, I load the projection images, do the flat field ...
user8443638
1
vote
1
answer
726
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OpenCv RGB Histogram Back-projection not working as expected
I use backprojection to locate a person in an image knowing the person's histogram. The issue is that it is not working on skin or on clear clothes.
Here is what I get : Back-projection result
Here ...
- 158
0
votes
1
answer
148
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2D edge to 3D modelspace via glm::unproject - ray not intersecting with model
I try to do ray picking with collision, which means a 2D position on the screen is transformed into a 3D position in model space.
My problem is, that the ray doesn't always intersect with the model to ...
- 115
0
votes
1
answer
680
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Edge orientation histogram back projection
I am working on an object detection module using opencv , and I am using the "Edge Orientation Histogram" as the object descriptor.
after generating the histogram, I back project it onto the original ...
- 41
2
votes
1
answer
265
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Qualitative and Quantitative analysis of filtered back projection / iradon in matlab
I was wondering if anyone encountered this issue.
I can reconstruct images from matlab that resembles the original image, however, the actual values are always different.
For example, original image ...
- 21
2
votes
1
answer
1k
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Issue with BackProjection and Opencv
I am trying to implement a backprojection algorithm with opencv to detect hands. This algorithm is composed from multiple sources. I have tried multiple methods such as morphologies and adding ...
- 813
1
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0
answers
308
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CamShift only tracks object sometime, even though BackProjection is very good
edit: it seems like the side of the frame the object enters from matters. Not sure why it would, but entering from the right it always get picked up, from the top, it never does, until it gets close ...
- 25
1
vote
0
answers
345
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How to determine point's 3D coordinates in a 3D triangle with knowing it's 2D coordinates
I have this code in a VB Class which converts a 3D point to 2D point to draw on screen:
Dim N As Point3D, Triangle As Point3D
N.X = 20: N.Y = 30: N.Z = 40
For I = 0 To 2
With N
ZX = .X ...
- 27