Translator Disclaimer
Paper
4 March 2014 Pixel structure for asymmetry removal in ToF 3D camera
Author Affiliations +
Proceedings Volume 9022, Image Sensors and Imaging Systems 2014; 90220C (2014) https://doi.org/10.1117/12.2039293
Event: IS&T/SPIE Electronic Imaging, 2014, San Francisco, California, United States
Abstract
Most of time-of-flight (ToF) cameras have a 2-tap pixel structure for demodulating a reflected near infrared (NIR) from objects. In order to eliminate the asymmetry between two taps in the pixel, a ToF camera needs another measurement, which collects photo-generated electrons from reflected NIR by inverting the phase of clock signals to transfer gates. This asymmetry removal needs additional frame memories and suppresses the frame rate due to the additional timing budget. In this paper, we propose novel asymmetry removal scheme without timing and area overheads by employing 2×2 shared 2-tap pixels with cross-connected transfer gates. The 2-tap pixel is shared with neighbor pixels and transfer gates in the pixel are cross-connected between upper and lower pixels. In order to verify the proposed pixel architecture, an electron charge generated in floating diffusion is simulated. And then we try to calculate a depth from camera to objects using simulated electron charge and measure a linearity of depth. In simulation result, proposed pixel architecture has more linear graph than conventional pixel structure along the real distance of objects.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Byongmin Kang, Jungsoon Shin, Jaehyuk Choi, and James D. K. Kim "Pixel structure for asymmetry removal in ToF 3D camera", Proc. SPIE 9022, Image Sensors and Imaging Systems 2014, 90220C (4 March 2014); https://doi.org/10.1117/12.2039293
PROCEEDINGS
7 PAGES


SHARE
Advertisement
Advertisement
RELATED CONTENT

MOEMS-based time-of-flight camera for 3D video capturing
Proceedings of SPIE (March 13 2013)
Depth correction in ToF camera
Proceedings of SPIE (March 12 2013)
Correction of a phase dependent error in a time of...
Proceedings of SPIE (May 23 2013)
SPADAS a high speed 3D single photon camera for...
Proceedings of SPIE (February 27 2015)
Harmonic distortion free distance estimation in ToF camera
Proceedings of SPIE (January 27 2011)

Back to Top