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Sx and video capture. — Parallax Forums

Sx and video capture.

Clock LoopClock Loop Posts: 2,069
edited 2006-01-06 02:16 in General Discussion
I am new to sx development, acutally i haven't even purchased anything yet. But looking into it.

My question is, how hard is it to capture video from a CCD sensor using a SX and then send that data over a data limited medium of somewhere around 57.6k or less.

What kind of video quality can I expect at 57.6k (or lower depending on connection quality)

Would it be eaiser to capture data from a USB camera, instead of a CCD?

I know nothing about the SX chips and know even less about whats possible when trying to do video.

Anyone with info would be greatly appreciated.

Comments

  • Clock LoopClock Loop Posts: 2,069
    edited 2005-12-30 04:55
    No one has input?

    Am I again going to have to pioneer my path into this unknown and uncharted territory?
  • danieldaniel Posts: 231
    edited 2005-12-30 05:15
    Perhaps you want to research the CMUcam.· I understand that the first version used an SX as the processor.

    HTH,
    Daniel
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2005-12-30 09:40
    I think this is a very interest idea, but I am not sure how to go about it.
    You would definitely have to add RAM to store whatever you capture as the SX-48/52 are limited.

    They do have the speed and you are dealing with a lot of format considerations.
    Obviously color adds a lot to the processing burden too.

    Take a lot at the XGameStation in the Sale! section of the Parallax Store.
    The developer wrote a 800 page text to teach others how to use the SX with Video and developed that platform to teach it.
    It is well worth the $199 as you won't have to reinvent everything and build from scratch.

    Along the way, you may get exactly what you want.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)

    ······································································ Warm regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan
  • Clock LoopClock Loop Posts: 2,069
    edited 2005-12-30 19:08
    Kramer said...

    It is well worth the $199 as you won't have to reinvent everything and build from scratch.

    Along the way, you may get exactly what you want.


    Well, for $199, I don't mind reinventing everything. Its well worth the learning experience.

    I went ahead and ordered the SX Tech Tool Kit PLUS. [noparse]:)[/noparse]

    Post Edited (BPM) : 12/30/2005 7:13:20 PM GMT
  • BeanBean Posts: 8,129
    edited 2005-12-30 20:11
    If I was doing video capture I would use a SX48, a parallax SRAM, a LM1881 sync seperator, and a 6 or 8 bit "flash" ADC.
    You might be able to get away without the LM1881 by using the ADC to sense the sync signals.
    It will be quite a challenge to get it working. Good Luck.
    Bean.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "SX-Video·Module" Now available from Parallax for only $28.95

    http://www.parallax.com/detail.asp?product_id=30012

    "SX-Video OSD module" Now available from Parallax for only·$49.95
    http://www.parallax.com/detail.asp?product_id=30015

    Product web site: www.sxvm.com

    "I hope the goonwave is not vaporware"
    ·
  • Clock LoopClock Loop Posts: 2,069
    edited 2005-12-30 21:21
    Bean (Hitt Consulting) said...

    It will be quite a challenge to get it working. Good Luck.
    Bean.

    I can't wait. I like challenges. I suppose I should read up on how to turn data from a ccd into a composite signal.
  • Clock LoopClock Loop Posts: 2,069
    edited 2006-01-05 23:01
    Bean (Hitt Consulting) said...
    If I was doing video capture I would use a SX48, a parallax SRAM, a LM1881 sync seperator, and a 6 or 8 bit "flash" ADC.
    You might be able to get away without the LM1881 by using the ADC to sense the sync signals.
    It will be quite a challenge to get it working. Good Luck.
    Bean.

    I think my biggest challenge is to try to cram video thru my limited 56kbit/sec pipe.
  • BeanBean Posts: 8,129
    edited 2006-01-06 00:50
    Low res grey scale with delta compression should be do-able.
    Bean.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "SX-Video·Module" Now available from Parallax for only $28.95

    http://www.parallax.com/detail.asp?product_id=30012

    "SX-Video OSD module" Now available from Parallax for only·$49.95
    http://www.parallax.com/detail.asp?product_id=30015

    Product web site: www.sxvm.com

    "I hope the goonwave is not vaporware"
    ·
  • Clock LoopClock Loop Posts: 2,069
    edited 2006-01-06 02:16
    Bean (Hitt Consulting) said...
    Low res grey scale with delta compression should be do-able.
    Bean.

    Hmm. What would DUAL 56kbit pipes get me?
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