ITK Release 4/Video/Time Stamp: Difference between revisions

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Line 39: Line 39:


= Scales =
= Scales =
* int32 : can count in microseconds, up to 4.5 years
** 2**32 / (30 * 3600 * 24.0 * 365 ) = 4.5 years


* double : can count in microseconds, up to 285 years
* double : can count in microseconds, up to 285 years
Line 46: Line 49:
** 2**64 / ( 1000000 * 3600 * 24.0 * 365 ) = 584942
** 2**64 / ( 1000000 * 3600 * 24.0 * 365 ) = 584942
** (or in nanoseconds up to 584 years)
** (or in nanoseconds up to 584 years)
= Units =
* Should the time units be specified ?
** Use microseconds ?

Revision as of 14:24, 29 November 2010

Reference Systems

VRPN - UNC

URL

http://www.cs.unc.edu/Research/vrpn/vrpn_getting_started.html

Time Stamp Structure

<source lang="cpp"> struct timeval 

 {
   __time_t tv_sec;		/* Seconds.  */
   __suseconds_t tv_usec;	/* Microseconds.  */
 };

</source>

OpenCV

  • include/opencv/cv.h: double timestamp
  • src/cv/_cvipp.h: float timestamp
  • 3rdparty/include/ffmpeg_/avformat.h: int64_t timestamp;

KWSys

  • static double GetTime();

ITK RealTimeClock

System Time

Scales

  • int32 : can count in microseconds, up to 4.5 years
    • 2**32 / (30 * 3600 * 24.0 * 365 ) = 4.5 years
  • double : can count in microseconds, up to 285 years
    • 2^53 / ( 1000000 * 3600 * 24.0 * 365 ) = 285
  • int64 : can count in microseconds, up to 584942 years
    • 2**64 / ( 1000000 * 3600 * 24.0 * 365 ) = 584942
    • (or in nanoseconds up to 584 years)


Units

  • Should the time units be specified ?
    • Use microseconds ?
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