I am making a program for a micro-controller connected to a radio that has to send bytes of a JPEG image to a computer. I want to know if there is a way to compensate for a situation where some bytes of the JPEG are lost. As it is now, if even 1 byte is lost it corrupts the whole image. I could program it so the micro-controller re-sends the bytes that were lost but I want to avoid wasting communication time for one or two bytes and I don't want to process too much on the micro-controller. So, it would be ideal if I could just fill in the blanks with placeholders because that way the picture would only be a few pixels off which is fine.
Compensating for missing jpeg bytes
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You could use JPEG restart markers but that would mean losing a row of MCU blocks or so when you get corruption, not just a few pixels (depending on how far apart you space them).
You need to add a Define Restart Interval marker at the start of the file (before Start Of Scan) to specify the restart interval in macroblocks.
Then in your stream, at an interval of however many macroblocks you specifed, you insert a 2-byte restart marker, using a counter that cycles between 0 and 7:
So, every time your decoder encounters an 0xFF byte followed by 0xDn (0-7) you can resync to a byte boundary. The 0xFF 0xDn sequence isn't allowed to appear in the normal compression stream (any 0xFF has to be followed by a zero padding byte, to avoid confusion).