TM-1020-15CL Progressive Scan High-Resolution Shutter Camera
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2
Dynamic Range Control
Typical interline transfer CCDs have fixed noise levels based
on dark current (thermal or KT noise), pattern noise, and oper-
ating clock speed.Typically for a 1k x 1k CCD operating at
20MHz pixel clock, the noise level is around 30 electrons.The
maximum capacity of the CCD charges is limited by the well
capacity at saturation.The range is limited by the structure and
the pixel size.
The TM-1020-15CL uses a 1” CCD with 9.0 µm x 9.0 µm
pixel and two-phase vertical shift register structure.The well
capacity is 50,000 electrons.The theoretical dynamic range is
50,000:30 = 1667:1 (64 dB).
A typical CCD camera does not use the full dynamic range
due to the nominal gain and the output specification such as RS-
170.The typical CCD camera has its gain set at 16 to 22 dB and
the RS-170 video level is 714 mV. Using 20 dB gain for the calcu-
lation, CCD output is limited to 714/10 = 71.4 mV. Since the
CCD’s saturation voltage is 400 mV to 500 mV, it uses less than
1/5 of the full dynamic range.
Machine vision and outdoor applications cannot afford to miss
image information behind the saturation, which is why the
dynamic range adaptation is critical.
Programmable LUT and Knee Control
(patent pending)
The TM-1020-15CL has a built-in LUT (look-up table) for
dynamic range control.At a specific gain setting, the offset (mini-
mum level... dark point) and A/D reference top voltage (maxi-
mum level... saturation point) are set to 10-bit A/D input so that
full dynamic range of CCD is utilized at 10-bit references as the
input and the LUT output is converted into 8-bit to adjust the
gamma correction.
The look-up table has two knee points (variable gamma selec-
tion) that allow the 10-bit to be segmented into three regions.
The look-up table selection can be made either by variable knee
curve or by direct input.
Scan Mode
Full Progressive Scan
Normal scanning mode for the TM-1020-15CL is 1008 x 1018
pixels.The standard speed with single-channel output is 15
frame/sec at the pixel clock of 20 MHz. Unlike an interlace scan
camera, the TM-1020-15CL reads every line from top to bottom,
resulting in all lines being obtained per captured image frame
with electronic shutter.
Two-Row Binning
This is a standard feature in the TM-1020-15CL.The camera
scans two rows together and outputs 1008 (H) x 508 (V) pixels
at 30 frames per second.Two-row binning is typically implement-
ed to increase speed.
Blooming adj. = 13. 5 V
Max. Digital dynamic range at 3 dB amp
(138 paginas)
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