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| Features |
- Video and bitmap image formats
- The Junior 4 capture board acquires color or monochrome video
images from composite interlaced video signals. The NTSC and
PAL color standards are supported. The monochrome video acquisition
complies with the so-called CCIR (625 lines) and EIA/RS-170
(525 lines) standards. Acquisition of full frame (two fields)
or single field images is selectable.
Before storing the acquired image into the destination memory
buffer, a pixel format conversion takes place in real-time.
Numerous color or monochrome formats can be chosen: RGB15, 16,
24, 32, Y8, YUV4:2:2, YUV4:2:0, packed or planar, and more.
- Acquisition
- Before PCI transfer to the PC, the acquired images can be
scaled to any format smaller than the original one, down to
1/12. The downscaling process involves a sophisticated hardware
device, performing an accurate interpolation in both the horizontal
and vertical directions. The image buffer for a downscaled image
is smaller in size, and its transfer needs less PCI bandwidth.
Moreover, any part of the incoming image can be retained for
further PCI transfer, allowing to define a region of interest.
All desirable adjustments can be applied to the images during
acquisition, such as video contrast, brightness, color saturation
and hue (NTSC only).
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- Bus mastering
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The
Junior 4 capture board is a PCI bus mastering agent that directly
stores the acquired images into the PC physical memory without
CPU involvement. As a unique feature, the Junior automatically
recovers the scatter-gather virtual memory mapping to present
the data as a regular bitmap image in a user allocated memory
buffer.
- Driver interoperability
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Thanks
to its basic architecture, Junior 4 may be operated with most
of the Conexant® Bt878/CN878A based drivers.
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