Some question about phase shift algorithm

So that means if I use 10th grayscale stripe. I need to define 10 sine wave and phase shift equation? There are different period with different gray code stripe.

If so, the sine waves are defined on reference stripe in every row (if I use vertical pattern), and to compute the deformation on every sine wave?(deformation means the stripe displacement, or the shifted horizontally)

And if that is ture, the sine wave of rows may have many phase (because there are many depth in a row), show on the figure.And how can I define the sine wave with many different phase?

My algorithm will refer to the TI demo system. Have you use three stripe with different phase on the same gray code sequence on the demo system?

And have you use phase shift sequence combined with gray code sequence?

thanks for your answer

Best regards,Timon

Hello! Fizix,

Now I concept every gray code stripe need three phase shift the least to compute the phase(also in your algorithm).

If that is true, the camera needs to capture 32 image when I use 10 gray code level. (all black pattern, all white pattern,and 30 pattern image that involve 10 gray code pattern with 3 different phase)

But when I capture the LightCrafter projector image, they do not have three phase pattern in capture image.(I think the system needs three phase pattern information on objects,so the camera needs to cpature three phase pattern image every gray code)

I have to confirm how many gray code pattern is used. The pattern count set "22". (all black pattern, all white pattern, 10 gray code levels, 10 binary code levels or not)

Why do not have phase shift pattern? (In theory we need to capture 62 image, and actually we only capture 15 images in system include all black and all white pattern)

thanks for your answers.

Best Regards,Timon

Hello! Fizix

I don't know how to define the "particular". However,my acknowledge that we need the phase shift algorithm to discriminate the stripe deformation.

The pattern and algorithm base on the LightCrafter system which looks like gray code pattern sequence and their inverse pattern.  

I can understand the inverse pattern can define the shadow region. But if there are no phase shift stripe pattern. How can I get the phase information and to compute the stripe deformation.

I try to understand the algorithm with LightCrafter demo system. How is the algorithm work? So my reference paper may be not the same method.(my reference paper all used phase shift method,but the demo sytem looks not)

The system developer is Sanjeev.

May I have to build a new question because the problem with the wrong tag if the algorithm don't use the phase shift algorithm.

thanks for your answers

Best Regards,

Timon

Hello Sanjeev,

I have ever read the document before. But there are no detail information and explanation on decoding.

The "decimal matrix" looks like encoding matrix. Every value is a  unique code. And subtract from reference.

I can't imagine the relationship between the unique code and disparity. Is that means the large different value represent the large disparity? Or I have to find the same unique code in the reference matrix and decimal matrix. And compute the displacement between their position?

Best Regards,

Timon