George Abrahams

Con actividad desde 2022

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

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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...

8 meses hace | 1

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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...

9 meses hace | 0

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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...

10 meses hace | 0

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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...

11 meses hace | 0

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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...

alrededor de 1 año hace | 0

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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, ...

alrededor de 1 año hace | 0

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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 ...

alrededor de 1 año hace | 0

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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 ...

alrededor de 1 año hace | 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...

alrededor de 1 año hace | 0

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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...

alrededor de 1 año hace | 0

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

alrededor de 1 año hace | 0

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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...

alrededor de 1 año hace | 0

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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...

alrededor de 1 año hace | 0

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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...

alrededor de 1 año hace | 0

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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...

alrededor de 1 año hace | 0

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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...

alrededor de 1 año hace | 0

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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 ...

alrededor de 1 año hace | 0

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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 ...

alrededor de 1 año hace | 0

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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...

alrededor de 1 año hace | 0

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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 = [ ...

alrededor de 1 año hace | 0

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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...

alrededor de 1 año hace | 0

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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...

alrededor de 1 año hace | 0

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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...

alrededor de 1 año hace | 0

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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...

alrededor de 1 año hace | 0

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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...

alrededor de 1 año hace | 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...

alrededor de 1 año hace | 0

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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...

alrededor de 1 año hace | 0

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How to plot a polytope in MATLAB using a given matrix ?
Hi @Ankur Deka. There's already a nice article on this topic. Please see https://mathworks.com/help/matlab/math/computing-the-co...

alrededor de 1 año hace | 0

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How to correlate vector and matrix time series?
If you're asking about code only, i.e., not statistical methdology, it would look this: % Example data. Using a smaller grid si...

alrededor de 1 año hace | 1

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How to take some points uniformly on the surface of the 3D model
Firstly, I'm assuming your model is in a triangular mesh format. If it's a point cloud, you can triangulate it with the alphaSha...

alrededor de 1 año hace | 1

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George Abrahams

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