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Superimposing Text/Graphics on a Live Composite Signal — Parallax Forums

Superimposing Text/Graphics on a Live Composite Signal

Aaron193Aaron193 Posts: 27
edited 2009-09-15 01:59 in Propeller 1
Hi, all.

I was curious to know if there is an easy way to program a Propeller Microcontroller to take a live composite signal, superimpose a pre-loaded bitmap image onto it at specified coordinates, and re-output it to a source, such as a TV. Like for instance: on the news, there is the reporter in the background and some sort of text/graphics down at the bottom of the screen which usually describes some breaking news or whatnot. Firstly, is this possible to accomplish such a task with a Propeller? Secondly, has anyone tried this or does anyone have any ideas/sample code for me to look at?

Aaron.

Comments

  • ericballericball Posts: 774
    edited 2009-09-15 00:31
    Search the forum for "LM1881" - which is a common composite sync separation chip.· A couple of the posts are on the subject you are discussing.


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    Composite NTSC sprite driver: Forum
    NTSC & PAL driver templates: ObEx Forum
    OnePinTVText driver: ObEx Forum
  • Mike GreenMike Green Posts: 23,101
    edited 2009-09-15 00:40
    Hitt Consulting made such a device for a while. The source code and schematic are open source. I even made a version of FemtoBasic that would run on it. I think his website is gone now, but you may be able to find his documentation with a Propeller or Completed Projects forum search.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2009-09-15 01:59
    The Propeller Backpack, which is soon to be released, will do this (without an external sync separator, BTW). I'm currently documenting a program by which the Backpack serves as a video overlay terminal for a BASIC Stamp. Stay tuned!

    -Phil
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