JAI CV-A1-20 - Manual (Page 7)

CV-A1-20
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 1/140,000 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, start-stop, smearless (Edge)
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. (83.6 µs). 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
Partial scanning.
Aspect ratio correct
1380 pixels
1/2 PS, 51
3 pixels
1/6 PS, 171 pixe
ls
1/3 PS, 341 pix
els
Fig. 9. Partial scanning.
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