Step 4: Projector-Camera Configuration

We'll use a "portrait" setup for this scan. This means that the projector and camera will be mounted on their sides. Projectors tend to have some internal lens shift: when you place a projector on a table, it projects the image "up" to a screen rather than shooting straight. To compensate for this, make sure the camera's optical axis is tangential to the surface the projector is hitting. In other words, if the projector has been rotated clockwise, keep the camera to the right of the projector.

At this point, the image planes of the camera and projector are approximately rectified: a horizontal line from the projector is a horizontal line on the camera. A white wall is helpful as a backdrop for testing that the camera and projector are aligned (in general, more reflective colors like white are easier to scan than darker colors).

Once aligned, the camera's perspective needs to have a vertical offset from the projector's perspective. Move the camera up: enough so you can see the curve in the cosine pattern being projected. Too much, and you'll be capturing a lot of shadows (areas where the projecting isn't projecting) or missing areas where the projector is projecting.

For mounting, you can use pretty much anything that is suitably stable. I've used everything from spider projector mounts, to desks with tape and cardboard, to music stands. The main goal is making sure that the geometry doesn't change while you're capturing each pattern.
Where can i find the software? And would an hdmi pico projector work for this?
<p>Thats breathtaking...</p>
<p>Ok, so I placed the pictures into ThreePhase, and it isn't doing anything. All it does is open to a white screen. What is the solution?</p><p>Here are my three test pictures:</p>
<p>Its trendy :)</p>
<p>yep ..while searching on the internet i found this structured light scanner software, well yeah it coast me 50 euro as i remember but it works perfectly for me especially that it does not force the user to use a DSLR camera (like the flexScan3d software) or a very precise video projector ( like David3d scaner soft force you to use )</p><p>i guess it s the most cheapest 3D scanner soft now</p><p><a href="http://rghost.net/private/7TGTnVFLw/3e2648710775d90835ef717f5ec6d1f0" rel="nofollow">http://rghost.net/private/7TGTnVFLw/3e2648710775d9...</a></p>
<p>I started working on a structured light scanner using a SHOWWX as <br> well. I&rsquo;m planning on replacing the red laser in the projector with an <br> infrared one, with a corresponding filter on the camera. This way, the <br> scan is invisible to the human eye.</p><p>It also leaves the blue and green lasers in place to allow for <br>projection onto the scanned surface in real time (well, with a few <br>hundred millisecond delay). For example, you could place a white sphere <br> in front of the scanner, find its shape and location, and project the <br>Earth onto it. As you move the object, it continues to be tracked, <br>allowing your projection to stay onit.</p>
<p>HI, New to this 3d scanning. I'd like to test the 'ThreePhase' software.</p><p>The images in the pattern folder are 1024*768. This is not the native resolution of my beamer. Could/ should I make new patterns in the native res. of my beamer for better result?</p><p>And the line pattern is not 'sharp'. Why is this?</p>
<p>Very nice. Thanks</p>
<p>Updated for processing 2.X:</p><p>https://github.com/kippkitts/3PhaseScanning/tree/master/ThreePhase </p>
<p>I am also getting the error &quot;Cannot find class or type named PriorityQueue&quot;</p><p>Any ideas?</p>
<p>Same issue (also with LinkedList in ThreePhase-1): I put:</p><p>import java.util.*;</p><p>In any source, but a new error appeared: java.lang.NullPointerException :/</p>
<p>Thats cold</p>
<p>Nicely done... Amazing instructable</p>
<p>Hey Guys,</p><p>if I have just a &quot;single-dot-laser&quot; I can determine X, Y and Z in help of the Triangulation.</p><p>So Z is Z = (f*b*tan(alpha))/(f+x*tan(alpha))</p><p>where</p><p>f -focal length</p><p>b - Laser Camera Disance</p><p>alpha - Laser Angle</p><p>So I have a Problem there. I calculated x because I need it in mm. So I did the following:</p><p>x = (x_pixel/pizel_widh_Image-0.5)*SensorSizeX</p><p>But my measurement are wrong. I am sure the Formula for Z is right. But I am not sure about x. Is there some one who can help me?</p>
<p>Its nice<br><br></p>
<p>Its extraordinary</p>
<p><br>Its exceptional :)<br></p>
<p>TOO GOOD</p>
<p>Nicely done... Amazing instructable</p>
<p>Hi Kyle,thats really very interesting,but i have faced the same problem as Erlud before<br>the problrm is with PriorityQueue:<br>PriorityQueue toProcess; Processing cannot find a class or type named &quot;PriorityQueue&quot;.</p><p> Can anyone help me?</p>
<p>Thats interesting</p>
<p>I saw this first on Open Processing! I am glad I found how to do it, this is amazing! Thanks</p>
<p>Great post, what was the depth resolution you could get ? Can this method be used to reproduce fine details ?</p>
<p>Thank you for the post Kyle, awesome work.</p>
Very interesting and informative. I have a cnc router if the camera and projector where mounted on the &quot;y &quot; axis could a series of images be taken along the length of a wide relatively flat carvings nd the series of images be inter grated so the original be reproduced. Thanks Laurie
Hi Kyle<br> My name is Erich. I tried to run the program in Processing but I recei un error over PriorityQueue toProcess; that processing cannot find a class or type named &quot;PriorityQueue&quot;. <br>What am I doing wrong?
Very nice Kyle
Quite cool.
Wow, super cool Kyle!!
Thank you for the post Kyle, awesome work.
Thats remarkable
how do you feel about using processing vs c++ (oF) I feel like processing is REALLY laggy when dealing with things like this. Maybe I am missing something?
hi kyle <br>I recently tried this code , its amazing how u get a very good scan with just 3 pictures <br>I still didn't get a good result for my scan, I was wondering if you can help me with it <br>but I don't know how to paste picture on Instructables , can anyone help ?? <br> <br>thanks in advance
Real-time Structured Light Virtual 3D Scanner scans virtual 3D objects in the virtual environment. http://3dracs.real3d.pk

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