Pulnix TM-1300 Manual de Instruções descarregar pdf (Página 23)

Page 15

Operation

TM-4000CL Series Progressive Scan Shutter Cameras

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’s gain is set at 16 to 22 dB and the RS-170

video level is 714 mV. Using 20 dB gain for the calculation, 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.

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

The TM-4000CL 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.

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.

3.7 Scan Modes

The TM-4000CL supports the following scan modes:

FIGURE 6. Scan Modes

3.7.1 Full Progressive Scan

Normal scanning mode the TM-4000CL is for 2048 x 2048 pixels. The standard speed with dual-

channel output is 15 frame/sec at the pixel clock of 40 MHz. The progressive scan reads every line from

line 1

line 2

n+1

line 1+2

line 3+4

(2n-1)+2n

Two row binning

Progressive scan

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 39 40

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