September 2nd, 2003, 03:53 AM
Rotating Jpegs in compressed domain
I am looking for an algorithm that provides the possibility to rotate a jpeg image without decompressing it. Did anyone ever hear of such an algorithm?
Thanks in advance,
September 17th, 2003, 02:37 PM
You will always need to decompress. Is the issue that you wish to perform the rotation in memory rather than writing to a temporary file?
September 17th, 2003, 03:46 PM
I need to rotate an image in an embedded system. Therefore we have some memory constraints which do not allow to keep the (decompressed) image in memory as a whole. I wonder if it would be possible to decode the Huffmann part and then rotate and reorder each block with its DCT coefficients.
September 17th, 2003, 03:47 PM
In that case, no idea. Sorry and good luck!
September 17th, 2003, 04:09 PM