Time Series of Lines and/or Columns

Time Series of Lines and/or Columns

This option produces a time series for multiple lines and/or columns in real time. The option supports both manual and computer synchronistion of the VTR.

Use what image to specify lines or columns ?

The cursor submenu is produced in order to specify the lines or columns for which the time series is being generated. This entry is used to specify the buffer displayed while the cursor submenu is active. Typically this buffer will contain an image showing the area of interest.

Cursor Positioning: Location for line/column

The cursor submenu is produced in order to specify the lines or columns for which the time series is being generated. For more information about the use of the cursor submenu, refer to [H Help] once the submenu has started.

Line or Column for this point ?

The time series may be generated for either the line or the column passing through this point. If you wish to accumulate the time series for both the line and the column, then specify this point twice.

Place time series for this line/column in which buffer ?

This entry specifies the buffer into which the time series for this line/column is put. While any buffer (except buffer 0) may be used, there is a substantial overhead in using buffers on the frame grabber card. It is recommended, therefore, that if you are acquiring the time series for more than 3 lines that you send them to extended memory buffers. There are two reasons that extended memory buffers are better: they can be accessed at the PCs internal bus speed (rather than the 8MHz ISA bus speed) and they do not require switching between different onboard buffer pages.

Specify another line/column ?

The answer to this question determines whether or not you wish to specify an additional line/column for which to generate a time series.

Accumulate time series for how long ?

This entry specifies the period of time for which the time series is to be generated.

A sample will be taken every !!R0 fields = !!GR1 seconds for !!R2 fields = !!GR3 seconds 



   The sample spacing to be used is available to a command file through !!R0
   (in fields) and !!R1 (in seconds). The total period is in !!R2 fields
   and !!R3 seconds. On completion this is replaced by period actually
   sampled (if different).




Manual or Computer control of VTR ?


   The VTR may be controlled either manually or by the computer. This entry
   selects which.





{If computer control of the VTR}



The VTR will be controlled by the computer.
Start time (offset from current position) ?


   This prompt is produced only if the computer is to control the VTR. It
   specifies where, relative to the current loction, the time series is to
   begin.





{If computer control of the VTR}



On completion Reposition video tape or Leave ?


   After the time series has been completed, the computer will either
   reposition the VTR to the start point (<R>), or leave it where it is
   (<L>).





{If manual control of the VTR}



Press any key to start acquisition (<Q> to abort)


   This prompt is produced if the VTR is to be controlled manually. Press any
   key other than <Q> or <escape> after starting the VTR to start the time
   series.





Errors, Warnings and Messages





Error Message:
Unable to copy all the lines requested during a single frame


   The lines/columns specified must be copied to the destination buffers
   before the next frame is digitised. This error message is produced if the
   copy operation could not be completed before the frame had passed.




Warning Message:
Sending the time series to onboard buffers may not allow as many
lines/columns to be specified


   This warning is generated if you specify more than 4 onboard buffers as
   the destination. While any buffer (except buffer 0) may be used, there is
   a substantial overhead in using buffers on the frame grabber card. It is
   recommended, therefore, that if you are acquiring the time series for more
   than 3 lines that you send them to extended memory buffers. There are two
   reasons that extended memory buffers are better: they can be accessed at
   the PCs internal bus speed (rather than the 8MHz ISA bus speed) and they
   do not require switching between different onboard buffer pages. This
   warning message is produced if some of the destination buffers are onboard
   and more than 3 lines/columns are specified. This warning is not generated
   if the option is started from a command file.





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Stuart Dalziel,
last page update: 19 February 1996