PMID- 29642506
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20180417
LR  - 20181114
IS  - 1424-8220 (Electronic)
IS  - 1424-8220 (Linking)
VI  - 18
IP  - 4
DP  - 2018 Apr 8
TI  - FPGA Based Adaptive Rate and Manifold Pattern Projection for Structured Light 3D 
      Camera System.
LID - 10.3390/s18041139 [doi]
LID - 1139
AB  - The quality of the captured point cloud and the scanning speed of a structured 
      light 3D camera system depend upon their capability of handling the object 
      surface of a large reflectance variation in the trade-off of the required number 
      of patterns to be projected. In this paper, we propose and implement a flexible 
      embedded framework that is capable of triggering the camera single or multiple 
      times for capturing single or multiple projections within a single camera 
      exposure setting. This allows the 3D camera system to synchronize the camera and 
      projector even for miss-matched frame rates such that the system is capable of 
      projecting different types of patterns for different scan speed applications. 
      This makes the system capturing a high quality of 3D point cloud even for the 
      surface of a large reflectance variation while achieving a high scan speed. The 
      proposed framework is implemented on the Field Programmable Gate Array (FPGA), 
      where the camera trigger is adaptively generated in such a way that the position 
      and the number of triggers are automatically determined according to camera 
      exposure settings. In other words, the projection frequency is adaptive to 
      different scanning applications without altering the architecture. In addition, 
      the proposed framework is unique as it does not require any external memory for 
      storage because pattern pixels are generated in real-time, which minimizes the 
      complexity and size of the application-specific integrated circuit (ASIC) design 
      and implementation.
FAU - Atif, Muhammad
AU  - Atif M
AUID- ORCID: 0000-0002-2228-0301
AD  - Intelligent Systems Research Institute (ISRI), College of Information and 
      Communication Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, 
      Korea. m.atif@skku.edu.
FAU - Lee, Sukhan
AU  - Lee S
AD  - Intelligent Systems Research Institute (ISRI), College of Information and 
      Communication Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, 
      Korea. lsh1@skku.edu.
LA  - eng
PT  - Journal Article
DEP - 20180408
PL  - Switzerland
TA  - Sensors (Basel)
JT  - Sensors (Basel, Switzerland)
JID - 101204366
PMC - PMC5948509
OTO - NOTNLM
OT  - adaptive frame rate pattern projection
OT  - hardware synchronization
OT  - structured light 3D camera system
COIS- The founding sponsors had no role in the design of the study; in the collection, 
      analyses, or interpretation of data; in the writing of the manuscript, and in the 
      decision to publish the results.
EDAT- 2018/04/13 06:00
MHDA- 2018/04/13 06:01
PMCR- 2018/04/01
CRDT- 2018/04/13 06:00
PHST- 2018/02/19 00:00 [received]
PHST- 2018/04/04 00:00 [revised]
PHST- 2018/04/06 00:00 [accepted]
PHST- 2018/04/13 06:00 [entrez]
PHST- 2018/04/13 06:00 [pubmed]
PHST- 2018/04/13 06:01 [medline]
PHST- 2018/04/01 00:00 [pmc-release]
AID - s18041139 [pii]
AID - sensors-18-01139 [pii]
AID - 10.3390/s18041139 [doi]
PST - epublish
SO  - Sensors (Basel). 2018 Apr 8;18(4):1139. doi: 10.3390/s18041139.