Both imagers are treated in exactly the same manner. It is not possible to set a different exposure or gain on each imager.
Digitization control can operate in either manual or automatic mode. Refer to Figure
In manual mode, the user program sets the exposure and gain. The exposure and gain are based on a 0 to 100 scale. Here are some tips for setting exposure and gain.
•In general, keep the gain as low as possible, since it introduces additional noise into the system. Use it only if the exposure is set to maximum, or if the exposure must be kept low to minimize motion blur.
•Adjust the manual iris of the lens to as small an opening as possible for your application, without having to use gain. This will increase the depth of field and give better optical performance.
6.3Subsampling
In many applications it is not necessary to work with the the full 640x320 pixel array. The CCD image processors are capable of reducing the amount of information contained in the digital video stream sent back to the host. They do this by averaging the values from neighboring pixels, giving a higher
Figure 6-2 shows the frame size control on the video capture application. The two frame sizes allowed are 640x480 (full frame) and 320x240 (x2 binning).
6.4Subwindowing
The
2001 VIDERE DESIGN
Figure 6-2 Frame size control in the main capture window.
6.5Frame Rates
Frame rates from the
Frame Rates, Hz | Monochrome | Color |
320x240 | 30, 15, 7.5 | 30, 15, 7.5 |
640x480 | 30, 15, 7.5 | 30, 15, 7.5 |
Table
modes.
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