George Abrahams

Active since 2022

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PhD graduate in Biomedical Engineering (Robotics) from King's College London.

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bwgrowregions: Multi-class region growing for binary images
aka Geodesic Voronoi. Useful for centerline- or skeleton-based image segmentation.

4 months ago | 2 downloads |

Answered
How to create a 3D world and simulate a virtual camera in MATLAB on MacOS?
To extend @Umar's answers, to go from image points to an actual image made of up pixels rather than something more like a scatte...

5 months ago | 1

| accepted

Answered
How to preserve subscript or superscript formatting in a text string?
Hi @Leon, For text-based graphics objects, such as title or xlabel, MATLAB uses the following syntax for superscripts and subsc...

6 months ago | 0

Submitted

plotframe: Plot a 3-D Cartesian coordinate system
hg = plotframe( rotationMatrix, translationVector, basisVectorLengths, Name=Value )

6 months ago | 35 downloads |

Answered
How to rewrite code without nested loops
This can be solved using a built-in MATLAB solver, ode45. However, the logistic equation actually has an analytic solution. See...

7 months ago | 0

Answered
How to display the coordinate system of the figure (UCS icon)?
Heres what I think is a pretty nice solution. The coordinate system bases (arrows) are plotted with my plotframe function on Fil...

8 months ago | 0

Submitted

3D Rendering Toolbox: Color image and depth map from mesh
A notable use case is to simulate RGB or Kinect (depth) camera images for computer vision applications.

8 months ago | 17 downloads |

Answered
Camera looking down the negative Z-Axis
Hi @Alex Ruiz. This is equivalent to an 180 degree rotation around the camera's local X-axis. The position of the camera won't b...

9 months ago | 0

Answered
Get visible vertices of a 3D mesh.
Hi @Gaurav. You essentially want the rasterization process, but using the subpixel location of the vertices on the image plane, ...

9 months ago | 0

Answered
How to get projected depth values from camera toolbar while displaying a 3D mesh.
Hi @Gaurav. My 3D Rendering Toolbox on File Exchange will easily handle this. For example, you can see the toolbox generating a ...

9 months ago | 0

Answered
Creating a depth map of a 3D surface
Hi @Ben. My 3D Rendering Toolbox on File Exchange will easily handle this, assuming that you want a perspective projection. For ...

9 months ago | 1

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convert stl file to depth map
Hi @Yuval Braun, you need a renderer. My 3D Rendering Toolbox on File Exchange will easily handle this. For example, you can see...

9 months ago | 0

Answered
Z map of Camera
Hi @Afsaneh, you need a renderer, either rasterized or ray-traced (slower). My 3D Rendering Toolbox on File Exchange will easily...

9 months ago | 0

Answered
Using camera intrinsics in surface plot
See world2img. Requires the Computer Vision Toolbox.

10 months ago | 0

Answered
Help! Project a 3D Mesh to an image - how to get the corresponding 2d coordinates with 3D points
If you're not commited to using the MATLAB axes' camera, my 3D Rendering Toolbox on File Exchange contains the function world2im...

10 months ago | 0

Answered
get projection image without rendering to screen
My 3D Rendering Toolbox on File Exchange is one option for doing this. The world2image function performs the perspective project...

10 months ago | 0

Answered
How can I get the image plane of a rendered 3D mesh?
Me again. The alternative is to, like you said, render it yourself with perspective projection etc. This will give you full cont...

10 months ago | 0

Answered
Simulate real camera capturing process
For anyone else landing on this page with a similar question, the issue with getframe is that you can't control the sensor resol...

10 months ago | 0

Answered
How to generate 2D grid map inside of a patch area
Hi @David Hermann. A 2D grid map of a patch sounds suspiciously like an image of the patch. Considering that you're first extra...

10 months ago | 0

Answered
Why is vec2mtx missing some grid points?
vec2mtx is an implementation of a line drawing algorithm. It takes a continuous line segment and converts it to a discrete grid ...

10 months ago | 0

Answered
create a loop within another loop as the parameter changes
Hi @Alessandro. Unfortunately your code contains mismatched brackets in the calculation of Tr, we don't know the sizes of rhob ...

10 months ago | 0

Answered
how to caculate using time of the MATLAB Online (basic): ?
You'll need to give more information. Are you trying to time something, like the execution time of a piece of code? If so, timei...

10 months ago | 0

Answered
2D plot using data from different text files
Something along these lines? (Pun intended) fileNames = [ "a.txt", "b.txt", "c.txt", "d.txt", "e.txt" ]; angleOfIncidence = [ ...

10 months ago | 0

Answered
How to estimate the depth map for a 2D face image?
This task is called "monocular depth estimation" and it is a heavily researched field. For a still image, the most common, trad...

10 months ago | 0

Answered
How to find depth map image by using a single image......?????
This task is called "monocular depth estimation" and it is a heavily researched field. For a still image, the most common, trad...

10 months ago | 0

Answered
How can I get the image plane of a rendered 3D mesh?
The most literal answer to your question is getframe. For example: surf( peaks ) % Convert the plot to an image. F = getframe...

10 months ago | 0

| accepted

Answered
How do I convert focal length from mm to pixels?
Let be the focal length in mm, be the focal length in pixels, and be the pixel size in mm. Then, and . The values for sho...

10 months ago | 0

Answered
Trasform focal length from pixel to world unit
Hi @dix93. Please see the camera calibration documentation on the intrinsic parameters. The intrinsic matrix has the following e...

10 months ago | 0

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Why is the unit of focal length in pixel when you multiply mm and pixel?
Hi @sinan saglam. I'm assuming that you're referring to the cameraIntrinsics documentation. At the time of writing, it describes...

10 months ago | 0

Answered
intersect and delete 3D Mesh
Hi @Alexander. This is known as constructive solid geometry (CSG). Here are a few MATLAB resources for you. gptoolbox on File E...

10 months ago | 0

George Abrahams

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