AW00089317000 Image Acquisition Control
Basler ace GigE 113
Deinterlaced New Fields Output Mode: Each time the camera receives a frame trigger signal it
acquires two fields, combines them into a single frame, and transmits the frame.
After receiving a frame trigger signal, the camera first acquires and reads out an image using the
field 0 scheme and it places this image into the camera’s memory. The camera then acquires and
reads out a second image using the field 1 scheme. The data from the two acquired images is
deinterlaced as shown in Figure 60, and the deinterlaced image data is transmitted as a single
frame.
In deinterlaced new fields output mode, the deinterlaced pixel data from field 0 plus field 1 is
considered to be a frame. It is not necessary to issue a separate frame trigger signal to acquire each
field. When a frame trigger signal is issued to the camera, it will first acquire field 0 and will then
automatically acquire field 1 without the need for a second frame trigger signal. When acquiring
each field, the camera will use the full exposure time indicated by the camera’s exposure time
parameter setting.
If a camera is operating in deinterlaced new fields output mode and is set, for example, for 30
frames per second, it will acquire 60 fields per second. Since two fields are combined to produce
one frame, the camera will end up transmitting 30 frames per second. When set for a 30 frames per
second rate, the camera will begin acquiring field 0 each time it receives a frame trigger signal and
will automatically begin acquiring field one 1/60th of a second later.
The main advantages of using the deinterlaced new fields output mode are that it provides pixel
data for a "full height" image and that it provides much more image information about a given scene.
The disadvantage of using the deinterlaced new fields output mode is that, if the object being
imaged is moving, there can be significant temporal distortion in the transmitted frame.
Frame
Field 0
Pixel Data
Field 1
Pixel Data
Row 0 + Row 1
Row 1 + Row 2
Row 2 + Row 3
Row 3 + Row 4
Row 4 + Row 5
...
Row 6 + Row 7
Row 7 + Row 8
Row 8 + Row 9
Row 9 + Row 10
Row 5 + Row 6
...
Fig. 60: Deinterlaced New Fields Output Mode
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