Programmable Look-Up Table (Lut) And Knee Control - JAI TM-1327GE Series User Manual

TM/ RM -1327GE Series
Figure 34. No-Delay Shutter
8.5.4 Async Direct Shutter
Async Direct Shutter exposure is determined by a direct shutter value entered from 1 to 1040. The
shutter value equals 1.5H (horizontal line time) or 47.6 μsec. for each increment. The Async Direct
Shutter exposure timing functions exactly the same as the internal shutter speed control. Async
Direct Shutter is controlled by GigE camera acquisition software and sent serially through an
Ethernet cable to the camera. The GUI interface that controls Async Direct Shutter exposure is
illustrated in Figure 33 below.
Figure 35. Async Direct Shutter

8.6 Programmable Look-Up Table (LUT) and Knee Control

The TM-1327GE 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.
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Hardware Operation 41