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My Question is as below in two parts……

QUESTION (IN SHORT):

• To generate point cloud of real-world object….

• Through 360 degree rotation of it….on rotating table

• Getting 360 images… one image at each degree (1° to 360°).

• I know how to process image and getting pixel value of it.

• See one sample image below…you can see image is black and white...because I have to deal with the objects which are much shiny (glittery)…and it is DIAMOND. So I have setting up background so that shiny object (diamond) converted in to B/W object. And so I can easily scan outer edge of object (e.g. Diamond).

• And one thing to consider is I don’t using any laser… I just using one rotating table and one camera for taking image…you can see one sample project over here… but there MATLAB hides all the things…because that guy using MATLAB’s in Built functionality.

• Actually I am looking for Math routine or Algorithm or any Technique which helping me out to how getting point cloud…….using the way I have mentioned……..

MORE ELABORATION:

I need to have point-cloud of real-world object. So, I can display it in Computer Screen.

For that I am using one rotating table. I will put my object on it and I will rotate table a complete 360° degree rotation and I will take 360 images…one image at each degree (1° to 360°).

Camera which is used for taking image is well calibrated. I have given one sample image as below. I also know how to scan image and getting pixel value of it.

Also take in consideration that my images are Silhouette type…means just black and white... No color images.

But my problem is or where I am trapped down is in...

Getting Points cloud of object…….from the data which I have getting through processing of image.

One same kind of project I found over here…….. But it just using built in MATLAB functions…I am using Microsoft Visual C#.Net so I have to build the entire algorithm myself….because MATLAB hides all the things which I want to know….

Is there any master…….who know this entire thing well and getting me out of trap...!!!! enter image description here

Thanks…..

Pritesh
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  • What technique is it you want to use? You're mentioning previous work using structured light, but show an image with a red contour. Is this red contour something you're already able to generate yourself? – Bart May 12 '11 at 11:08
  • no..no.... That red line is drawn by me....that is scan line....outer line of object...i will take pixel value(x,y value) along that red line... – Pritesh May 12 '11 at 20:50

1 Answers1

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I have no experience of this but If I wanted to do something like this I would have tried this:

  1. Use a single color light source
  2. if Possible create a lightsource which falls on a thin verticle slice of the object.
  3. have 360 B/W Images, those Images will be images of a verticle line having variyng intensity. If you use matlab your matrix will have a/few column with sime values.
  4. now asume a verticle line(your Axis of rotation). 5 plot or convert (imageno, rownoOfMatrix, ValueInPopulatedColumnInSameRow)... [Assuming numbering Image from 0 to 360]
  5. under ideal conditions A lame way To get X and Y use K1 * cos imgNo * ValInCol and K1 * sin imgNo * ValInCol, and Z will be some K2 * rowNum.. K1 and K2 can be caliberated knowing actual size of object.

I mean Something like this: http://fab.cba.mit.edu/content/processes/structured_light/

but instead of using structured light using a single verticle light

http://www.geom.uiuc.edu/~samuelp/del_project.html This link might help in triangulation...

Shubham
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  • Pritesh, I have edited my answer after your comment and I actually can't see the Image which you have posted... If you can show any Image I can say more... you mentioned your Image is Silhouette I couldn't imagine hoe good Silhouette something shiny can make.. – Shubham May 12 '11 at 11:17
  • you can see one video over here [http://www.youtube.com/user/PriteshAryan?feature=mhee] ......that will explain what i exactly need is......by the way...though i have displayed 3D Object in Computer screen using just single camera....in that video...but it is not much accurate...so i am looking for the standard way.... – Pritesh May 12 '11 at 12:20