Driver Software
PHYTEC Meßtechnik GmbH 2004 L-608e_4
163
If small formats are often required, we recommend to apply separate
fields. In this case you allocate two memory regions with two pointers
providing the start addresses. They are transferred to the function by
the parameters pOImgBuf and pEImgBuf for odd- and even-fields. The
parameter nInterlaced is set to 0, in order to indicate, that the fields
are stored in separate memory regions.
If whole frames are required, because the resolution should be more
than 288 lines, the Grabber can be instructed to store the frame in one
single memory region. The Grabber automatically will interlace the
two fields. If this option is required, you have to set nInterlaced = 1.
In this case the start address of the frame in the memory is transferred
by the parameter pEImgBuf.
Note:
This region must contain both fields, so that the region must be twice
in size of one field. The odd parameter pOImgBuf is not used in the
interlaced mode (nInterlaced=1).
If only one field (even or odd) should be digitized, the pointer of the
field, which is not digitized is set to
N
ULL
. Therefore if only one even
field is required you have to set pOImgBuf =
NULL
.
Finally the type of image recording, is described: With
nSingleShot = 0 the Grabber is instructed to digitize continuously.
That means, that after the start continuously digitized information are
stored in the memory in real time (50 fields per sec.). In field mode
(nInterlaced = 0) the information is stored to one memory region
(20 ms), then to the other region (another 20 ms) alternatingly.
This means, that each field memory region is at least not accessed
from the Grabber for at least 20 ms.
For frame mode (nInterlaced = 1) the Grabber stores continuously to
the common memory, 20 ms the odd and then 20ms the even lines.
Содержание eGrabber-4plus
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