[LostBoy]

Hi all,

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,
a LostBoy

[Ian Griffiths]

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?

[LostBoy]

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.

[Ian Griffiths]

In that case, no idea. Sorry and good luck!

[LostBoy]

thx