Pco VC45, Operating Instructions Manual

Page: 14 / 30

14
1. Video Camera VC45

PCO 1999
VMC45-03/99
1.4 Mode Settings
Operating Mode The camera runs in two different operating modes:
•
FRAME interlaced
•
FIELD interlaced
Hint At continuous illumination the brightness of the image is the
same in FIELD or FRAME mode:
CCIR: 40ms with 1 pixel or 20ms with 2 pixels
RS170: 33ms with 1 pixel or 16.5ms with 2 pixels
However, with externally applied shuttering (e.g. flashlight or la-
ser pulse), the FIELD mode generated image has double the
brightness of a FRAME mode generated image.
In the FRAME interlace mode the camera produces two fields
generated with a time shift FIELD 1 and FIELD 2 (odd respect.
even lines). These fields are each integrated for 40ms.
The FIELD interlace mode combines 2 lines (1+2, 3+4, ... in
FIELD 1 and 2+3, 4+5, ... in FIELD 2). FIELD 2 is shifted by one
line in respect to FIELD 1 (line shifting).
FIELD 1
1
3
5
FIELD 2
2
4
6
FRAME
INTERLA-
Integration Time: 2 x 40ms (CCIR)
2 x 33.4ms
Image 1
Image 2
1 2
Video Out
FIELD 1
1
2
3
4
5
6
FIELD 2
1
2
3
4
5
6
INTERLA-
FIELD
Integration Time: 2 x 20ms (CCIR)
2 x 16.7ms
Image 1
Image 2
1 2
Video Out