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3—Basic Operation of the Tau 640 and GUI
Tau 640 User’s Manual
3-20
June 2011
TAU-0640-00-10, version 110
Camera Digital Output
Note
Note
Off
: The digital data stream coming from the Tau 640 camera is turned off.
8-bit
: Data from the 640
×
480 (NTSC) or 640
×
512 (PAL) video pixels is provided
after application of the current Automatic Gain Control (AGC) and Dynamic Detail
Enhancement (DDE). The 8-bit data is essentially a digital version of the same data
provided on the analog video channel.
14-bit Filtered
: Data from 640
×
512 pixels is provided prior to video processing
modes in the 8-bit data described above. The 14-bit data is the
filtered
data to include
the Dynamic Detail Enhancement (DDE) and will appear gray when saving 16-bit TIFF
files. See “Tau 640 Digital Data Channel” on page 4-1.
14-bit Raw
: Data from 640
×
512 pixels is provided prior to all video processing and
does not include the Dynamic Detail Enhancement (DDE) or bad pixel replacement.
The 14-bit data is the ‘raw’ data and will also appear gray when saving 16-bit TIFF
files. See “Tau 640 Digital Data Channel” on page 4-1.
XP Mode Select
The Tau 640 camera has 18 XP pins on the 50-pin Hirose connector. The XP mode
uses a number of these pins to output parallel digital image data.
BT656
: The BT.656 parallel output is a common interface which will drive many LCD
displays. The data is digitally encoded NTSC/PAL video and will have AGC, DDE,
symbols, and color included.
CMOS
: The CMOS interface is a parallel output that allows the user to access 8-bit
AGC corrected data or 14-bit data. The signal levels are 0 - 3.3 V CMOS logic and are
intended to drive boards mounted directly to the Tau 640 camera. CMOS is not
intended to drive a cable. An XP-board (1.5” by 1.5”) reference design is available
upon request.
The Revert feature is not available in CMOS or LVDS digital data.
AGC mode will only affect the digital data output if Camera Digital Output mode is set to 8-bit
data.