look at the Osprey 100 it is a pure frame grabber
At 10:52 AM 10/21/2002, you wrote:
Georgios Kapetanakis wrote:
>
> Hi all,
>
> I know this is getting slightly away from the core interest of the
list, but
> I need your help once more. I am convinced now that getting a frame grabber
> with a bt8x8 chipset is the best way to go, as far as driver support is
> concerned (bttv).
>
> I know of only two frame grabbers with this chipset:
> - Imagenation PXC200AL
> - Sensoray 611
>
> Are there any more? Please note that I am interested in frame grabbers for
> computer vision, not TV/Tuner cards....
But what's the difference between a computer vision grabber and a TV
card with the channel set to the raw video input?
Following for example is the output of a test program I wrote using the
functions in linux/videodev.h to query the bttv driver. You can set the
channel to 1 to receive video. I'm pretty sure that the video quality is
mostly limited by the video format itself, and that any grabber will
produce similar output for a given NTSC or PAL signal. The only other
issue is progressive scan, where you grab only a part of an image, but
there you might be better off getting a dedicated camera with image
processing built into it.
Hello world. Today we are going to look at the video grabber at
/dev/video
name of /dev/video: BT878(Hauppauge (bt878))
VID_TYPE_CAPTURE Can capture to memory
VID_TYPE_TUNER Has a tuner of some form
VID_TYPE_OVERLAY Can overlay its image onto the frame buffer
VID_TYPE_CLIPPING Overlay clipping is supported
VID_TYPE_FRAMERAM Overlay overwrites frame buffer memory
VID_TYPE_SCALES The hardware supports image scaling
Type 0xEB
4 channels
1 audio device
Max width: 768 Max height: 480
Min width: 48 Min height: 32
Video frame buffer base 0xe8000000
height 768 width 1024
depth 16
bytes per line 2048
* * * Channel 0: Television
has 1 tuner
Flags: 0x3: has tuner; has audio
Type: 0x1: TV; not camera
Norm: 0x1: NTSC
brightness 0x7FFF
hue 0x7FFF
colour 0x7D70
contrast 0x6B84
whiteness 0x0
depth 0x10
VIDEO_PALETTE_RGB565 565 16 bit RGB
* * * Channel 1: Composite1
has 0 tuners
Flags: 0x2: no tuner; has audio
Type: 0x2: not TV; camera
Norm: 0x1: NTSC
brightness 0x7FFF
hue 0x7FFF
colour 0x7D70
contrast 0x6B84
whiteness 0x0
depth 0x10
VIDEO_PALETTE_RGB565 565 16 bit RGB
* * * Channel 2: S-Video
has 0 tuners
Flags: 0x2: no tuner; has audio
Type: 0x2: not TV; camera
Norm: 0x1: NTSC
brightness 0x7FFF
hue 0x7FFF
colour 0x7D70
contrast 0x6B84
whiteness 0x0
depth 0x10
VIDEO_PALETTE_RGB565 565 16 bit RGB
* * * Channel 3: Composite3
has 0 tuners
Flags: 0x2: no tuner; has audio
Type: 0x2: not TV; camera
Norm: 0x1: NTSC
brightness 0x7FFF
hue 0x7FFF
colour 0x7D70
contrast 0x6B84
whiteness 0x0
depth 0x10
VIDEO_PALETTE_RGB565 565 16 bit RGB
/\/\/\/*=Martin
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