Hey Moe,
Thanks! Yes I think the problem is with multiple scan lines is my projector. The 3 LCD's (R,G,B) are not aligned, it is old and has taken a beating over the years.
This is a gray-code (pattern 07) left side is horizontal pattern and you can see purple edge on top and yellow/green on bottom of black. Then i made vertical patterns you see to the right, but here is blue on left and red on right of each black line.
To see what this causes i played with all patterns and combinations in photoshop to see what David sees
***Now i'm only guessing this is how it works from what i can see with photoshop:
If you only load the first 6 pics from your scan you will see all scan lines moving at once. Then David uses the last gray-code patterns to displayed them in the right order to simulate one line moving down entire screen. Scan data to the right shows those momentary flashes of second line which ruins the good data.
My line flashes are because the projector is not making a sharp edge to the gray-code patterns because of the color bleeding on edges of black lines. I noticed it because the flashes happen almost every complete sin wave. My solution is to photoshop down the brightness all the way on just that shade of purple and yellow/green, this will not work on an object with those same colors. Below is what the hand images with +2 close up filter looked like before i darkened the bleeding color from projector:
Long story short I am ordering a DLP projector! I've owned that panasonic LCD projector for years and have gotten my mileage out of it several times...
Moe I have been finding that generating my own "all black" first image from the fringe patterns is giving me interesting results, its kinda the reverse of editing all the other images as you suggested before (which has helped me get more out of scans, thanks!). I don't know if this black image creation thing works or it my be the faulty projector throwing me off, a few more tests and i'll have some info.
@ Kahlid Thank you. just read this post from beginning info is there, or the end of this other one:
viewtopic.php?f=2&t=1448&p=9266&hilit=structured+light#p9266@Karl I am currently taking still photos with a DSLR, I play video slideshow out to projector of all the slides and I have a remote shutter button for my canon camera. all i do is let the slideshow loop displaying each pattern for 1 second, just enough for me to snap photo of each one so i get a full scan (all 12 photos) in 12 seconds. I think Moe has some really nifty ardurino board and programing allowing him to shoot his canon camera at its maximum frames per second to get it in like 4secs or something.
What I plan to do is play out a video where each pattern is displayed for 3-4 frames 30fps and my canon(t1i) can also record 20fps full HD 1920x1080p. This should give me all 12 photos in 1.5sec, the problem with this method is i have to use a seperate video editing program to extract the 12 good frames and save them out as still images, also i get much higher resolution with the regular camera photos than HD video recording.
