CV-A1
5.4. CV-A1 Block Diagram
Fig. 8. Block diagram.
6. Functions and Operations
6.1. Basic functions
Some of the primary camera functions need a general introduction before the operation modes are described. The list below shows the primary functions from the command list.
SM | Shutter Mode | Normal shutter, Programmable Exposure |
SH | Shutter Speed | Off to 1/200,000 second |
PE | Programmable Exposure | 1.3 H to 1023.3 H |
SC | Scanning Format | Full frame, 1/2 partial, 1/3, 1/6 partial |
BI | Binning | Off, vertical, horizontal, vertical + horizontal |
TR | Trigger Mode | Normal, Edge, PWC, frame delay readout |
|
| Long time exposure, |
HC | HD Accumulation | Sync., async. |
The shutter SM can be set to normal (SM=0), where the exposure time is selected from 16 fixed step with the command SH, or programmable exposure (SM=1). The command PE allows 1023 step with 1 line period resolution. (58.4 ∝s). Note that PE=0 and PE=1 results in 1.3H.
The CCD scanning format SC can be selected between full or partial scanning. With partial scanning, only the vertical central part of the CCD sensor is read out with a higher frame rate. The partial scan is done by a fast dump read out of the lines in the vertical ccd register down to the top of the partial image. The partial part of the image is read out with normal speed. The lines below the partial image are read out and dumped with a high speed.
Some signal distortion can be expected below highlighted areas, (saturated areas). It is caused by limitation in the vertical ccd register transfer efficiency at high speed.
Imaged scene
1380 pixels
1/2 PS, 513 pixels 1/3 PS, 341 pixels 1/6 PS, 171 pixels
Partial scanning.
Aspect ratio correct
Fig. 9. Partial scanning.
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