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jakobwilm / slstudio

SLStudio -- Real Time Structured Light. A comprehensive software suite for capturing and reconstructing 3D scenes with a camera-projector pair.
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Some questions about the decode algorithm named DecoderPhaseShift2x3!! #33

Closed ghost closed 5 years ago

ghost commented 5 years ago

Hello, thank you for your work about the SLStudio. I have a question about the DecoderPhaseShift2x3 class in the SLStudio. Thank you for your answer. This decode algorithm uses single frequency phase shifting images (3 images) and phase cue patterns(3 images) to get the unwrapped absolute phase image using. In my work, I used three different frequency phase shifting patterns at least to get the absolute phase image. So, could you tell me the theory about DecoderPhaseShift2x3 or just give me the paper name you refered? thank you very much. @jakobwilm @snesgaard @ereh

ghost commented 5 years ago

Maybe giving the paper name in every decoding algorithm class should be a better action for understanding your work? Thanks a lot for your contribution.

jakobwilm commented 5 years ago

Hi Zhuang, thanks for your feedback. I do not have a reference for the exact algorithm. If you are familiar with phase shifting, you find that many variants are possible. Essentially, in the 2x3 codec, we are projecting an equivalent phase directly. Utilizing the heterodyne principle has some (theoretical) advantages, but I have not come to implementing it. A good reference is [1].

Best regards, Jakob

[1]: Reich Carsten, Ritter Reinhold & Thesing Jan, 1997. 'White light heterodyne principle for 3D- measurement', Proceedings of SPIE Vol. 3100: Sensors, Sensor Systems, and Sensor Data Processing.

jakobwilm commented 5 years ago

And yes. If I get the time, I will add references in the source files.

ghost commented 5 years ago

I got it, and many thanks for your reply again. @jakobwilm