2D to 3D

Question

Manoj Soundararajan 2012-3-15

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I am doing my graduation project.. I want to know about the conversion of 2D image into 3D image using cat3 function. Can anyone tell me the syntax behind the usage of "cat3" ???

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Answer 1

Thomas 2012-3-15

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https://ww2.mathworks.cn/matlabcentral/answers/32375-2d-to-3d#answer_40901

在 MATLAB Online 中打开

I'm not sure about the cat3 function. It is not part of MATLAB, is it from file exchange? or any particular toolbox.

cat is function used to concatenate arrays..

doc cat

will give you help about the function..

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Sean de Wolski 2012-3-15

I've made that typo many times as well.

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Answer 2

Sean de Wolski 2012-3-15

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在 MATLAB Online 中打开

cat(3,I1,I2,I3)
doc cat

for more info

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Answer 3

Manoj Soundararajan 2012-3-15

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https://ww2.mathworks.cn/matlabcentral/answers/32375-2d-to-3d#answer_40910

@Sean de Wolski: What are those I1, I2, I3? Are they 3 distinct images? Can all the three may be the same? Or is it necessary that they have to be distinct?

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Walter Roberson 2012-3-15

They can be the same or different.

It is important, though, that they *not* be TrueColor (RGB) images.

Manoj Soundararajan 2012-3-15

No they are not. Yet I don't get a 3D image.

Well !! Can u tell me about surf function ????

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Answer 4

Walter Roberson 2012-3-15

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Well, what do you mean by a "3d image" ? cat(3,I1,I2,I3) would be for creating an RGB image from individual color planes.

MATLAB does not have any (useful) volume visualization routines.

surf() is not designed for volume visualization.

You may wish to have a look at the File Exchange contribution http://www.mathworks.com/matlabcentral/fileexchange/3280-voxel

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Manoj Soundararajan 2012-3-16

I tried voxel already. That's not what I exactly need. Actually i want a human from an 2D image to be projected in a 3d plane such that its visible completly. I hope u got it now.

Walter Roberson 2012-3-16

Then what you need is an extensive model of the shape and material properties, colors, specular properties, light absorption properties of tissue, and varies other pieces of information about human bodies. And then you want models of your light positions, light spectral characteristics, light polarization properties, coherence of the light source, shape and material properties of the emission cavity; and you want to know about the atmospheric properties, humidity, dust particle size distribution, particulate composition in suspension in the atmosphere, molecular gas proportions and light absorption and polarization properties. Once you have all of this data, you want to put it through a good Ray Tracing program, which will probably hum away for half an hour or so to produce one single frame of the 3D view.

OR// you could refine your data set to finer-grained voxels and use a voxel rendering program. Some people have a fondness for that approach.

http://www.mathworks.com/matlabcentral/fileexchange/?term=tag%3A%22ray+tracing%22

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