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POEmbedded image capture - need help getting started
 

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  1. POEmbedded image capture - need help getting started
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    <p>I'm working on an embedded home surveillance system. I want to interface a couple of serial-enabled JPEG capture cameras, maybe a couple of door sensors, etc. Problem is, I can't for the life of me figure out how to interface a camera to a microcontroller. Stills, streaming video, it doesn't matter - I can't find any how-to documentation on this.</p> <p>I understand serial communications, and most of the camera documentation I've found out there describes the protocol necessary to instruct the camera to send the datastream down to the uC for capture. What they don't show is what you're supposed to do with the data once you get it.</p> <p><a href="http://www.4dsystems.com.au/prod.php?id=75" rel="nofollow">Here's an example</a>.</p> <p>They show a great little video, and the datasheet describes which bytes must be sent to the camera to retrieve the image. What I need is an example or tutorial of some sort that will explain what to do with the stream of bytes that make up the image itself. How do I arrange those bytes into an image and save it as a file? </p> <p>I've looked all over the place for a tutorial of some sort, but have come up dry. I'm not sure which processor I'll use for this project just yet, but this question isn't really processor-dependent. All I need is the algorithm, maybe a peek at a library, if one exists. I'll take that process and adapt it to my hardware, I just can't seem to find a place to get started.</p> <p>Have any of you done this? </p>
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    1. USMatthew Murdoch
    1. USGlenn
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    1. COThat's a badly written data sheet! "Package size must not be odd or multiple of 16" and then states limits of 64 and 512 that are multiples of 16, so probably they mean should. And package is probably a mistranslation of packet... Anyway, if you re-assemble the "packages" and write them out as a file, do you by chance get a valid jpeg? You could at least look for a jpeg header in there. Decoding their raw image may be harder, but you may get somewhere with a structured scene (vertical or horizontal white/black split) and a hex dump...
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      1. POEmbedded image capture - need help getting started
      1. USChris Stratton
    2. COIf you're sure your received bytestream contains the image, why don't you save it as a binary file and share it with us? It would be easier for those without a camera to help you.
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      1. POEmbedded image capture - need help getting started
      1. USmisha
    3. CO@ Chris - I'm glad to hear you thought it was a bad datasheet, I certainly didn't get much out of it. @ misha - Therein lies the issue: I don't have the camera yet. I'm looking to _design_ the system, but I don't even know what I need. What I'm hoping for is some sort of tutorial that will show me what to expect from the different types of cameras, and what to do with the data they send me. I don't necessarily expect you guys to write such a tutorial, I'm hoping one has already been written and I just haven't been able to find it. Do you know of any documentation like that?
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      1. USGlenn
 

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