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Camera Module output data format

Former Member

Hi.

 

I am interested in using a device similar to the OV7670. I am only taking small images (15mm x 10mm) of text so the resolution does not have to be great. I will initially be using an 8-bit MCU which do not have enough RAM to store an image. I would like to request each byte at a time from the device which I can then send to my pc.

 

My question is: Is it possible to request one byte at a time (or small blocks) from the OV7670. The online documentation only refers to frames, which are too big for my MCU to process.

 

Thanks,

 

Mark.

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  • Hello Mark,

    Welcome to the element14 Community, we hope you enjoy it! I will move this over to the Arduino area as it is a better fit.

     

    Thank you,

     

    Jamie

  • in reply to element14support

    I think that code is more to do with continuous transfer. What I need to know that once the device has taken a photo in snapshot mode is it saved to its internal menory or transmitted straight out. If it is saved internally can it be accessed piece by piece or does the transmission happen all at once?

  • in reply to Former Member

    Hi Mark,

     

    The (excellent) link that Paul posted transfers one line at a time as far as I understand.

    It has to do this, because the Arduino Uno has <2k of data memory as I understand.

    A simple video frame of even 160x120 low-resolution requires much more memory.

    The code is likely reading multiple frames.

    Your only practical options if you want to save to memory is to design a memory add-on to the Arduino

    or better still just find an alternative processor or board with sufficient memory. Or find a camera module with

    memory; they used to exist, and they saved as a JPEG image. They are not particularly interesting devices

    though - better to just get a more resource-rich dev-board, e.g. Raspberry Pi, and a camera module for it.

  • in reply to shabaz

    shabaz wrote:

     

    Hi Mark,

     

    The (excellent) link that Paul posted transfers one line at a time as far as I understand.

    It has to do this, because the Arduino Uno has <2k of data memory as I understand.

    A simple video frame of even 160x120 low-resolution requires much more memory.

    The code is likely reading multiple frames.

    Your only practical options if you want to save to memory is to design a memory add-on to the Arduino

    or better still just find an alternative processor or board with sufficient memory. Or find a camera module with

    memory; they used to exist, and they saved as a JPEG image. They are not particularly interesting devices

    though - better to just get a more resource-rich dev-board, e.g. Raspberry Pi, and a camera module for it.

    Exactly image

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  • in reply to shabaz

    shabaz wrote:

     

    Hi Mark,

     

    The (excellent) link that Paul posted transfers one line at a time as far as I understand.

    It has to do this, because the Arduino Uno has <2k of data memory as I understand.

    A simple video frame of even 160x120 low-resolution requires much more memory.

    The code is likely reading multiple frames.

    Your only practical options if you want to save to memory is to design a memory add-on to the Arduino

    or better still just find an alternative processor or board with sufficient memory. Or find a camera module with

    memory; they used to exist, and they saved as a JPEG image. They are not particularly interesting devices

    though - better to just get a more resource-rich dev-board, e.g. Raspberry Pi, and a camera module for it.

    Exactly image

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