Operation 21
RM/TM-1405GE Series
3.5.3
External VINIT With Pulse Width (No-Delay Shutter)
For multiple-camera applications such as 2D or 3D measurement and multi-angle inspection,
simultaneous image capturing at an exact shutter timing for all cameras is a critical requirement.
The TM-1405’s asynchronous pulse-width control mode provides no-delay shutter as standard.
Regardless of the internal pulse timing, the camera discharges at the VINIT leading edge and
transfers charges at the trailing edge of the pulse. Even though each camera runs with slightly
different H and data clock timing, the image capturing is exactly simultaneous.
Figure 9.
No-Delay Shutter
3.6
Programmable Look-Up Table (LUT) and Knee Control
The TM-1405GE has a built-in LUT (look-up table) for dynamic range control.
At a specific gain setting, the offset (minimum level.... dark point) and A/D reference top voltage
(maximum level... saturation point) are set to 10-bit A/D input so that the full dynamic range of the
CCD is utilized at 10-bit references as the input and the LUT output is converted into 8-bit to adjust
the gamma correction. Notice that the LUT (look-up table) is not available in the 10-bit grayscale
mode.
The look-up table has two knee points (variable gamma selection) that allow the 10-bit input to be
segmented into three regions. The look-up table selection can be made by knee curve direct input.
