using leostick to "insert" text into video

A shrunk down Leonardo-compatible board, thumb drive sized with native USB support. [Product info]
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leo_stuck
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Joined: Sun Jun 16, 2013 11:57 pm

using leostick to "insert" text into video

Post by leo_stuck » Tue Dec 10, 2013 11:20 pm

Hoping you can point me in the right direction.....I am using a leostick to collect & manipulate data & then i thought wouldn't it be good to insert the data (text) into the video recorded by the onboard camera on my project. Every $2 video cam has a time/date stamp so it can't be to hard to achieve...I just don't know where to start looking for info...if you can think of anything that may help me in my quest I would very much appreciate it. Huroo.

andrew
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Re: using leostick to "insert" text into video

Post by andrew » Wed Dec 11, 2013 8:03 am

There is chip that can be used to super-impose text and graphics over composite video with some extra circuitry, it's the (now) TI LM1881. You will find this of interest - it's a Uno-type shield but should set you on your way:
http://nootropicdesign.com/ve/

LukeW
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Re: using leostick to "insert" text into video

Post by LukeW » Thu Feb 27, 2014 6:55 am

There's also the MAX7456 which does this sort of thing using minimal external components and resources, just SPI control from a microcontroller and composite video in and out from the chip.

http://www.maximintegrated.com/datashee ... vp/id/5516

You should be able to control this from a LeoStick fine.

This will use less resources on the microcontroller compared to using an LM1881 sync separator to separate the sync signals from the video, and build the overlay video all on the host microcontroller and add it on.

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