Data Compression algoritms

sisto · ‎2003-09-01

Posted on September 02, 2003 at 05:57

sisto · ‎2003-08-28

Posted on August 28, 2003 at 11:14

HI there,

has anyone developed encode/decode algoritms to compress/expand ASCII strings and/or graphic data bytes to reduce flash look-up tables dimensions ?

I'm working around a project which use a 64x128 graphic LCD, so You can understand the problem.

sixtus

coor · ‎2003-08-31

Posted on September 01, 2003 at 06:00

LZH.

sisto · ‎2003-08-31

Posted on September 01, 2003 at 06:28

Hi coordinator,

beautiful, concise, extremely clear answer, I appreciate the attention, but it was not that my question !

Evidently you don't have used Your ''lateral mind''.

My direct question is : is there anybody which could provide me the ''C'' or assembler sources ?

Thanks for Your attention.

sjo · ‎2003-08-31

Posted on September 01, 2003 at 08:48

probably the simplest to implement in a 8bit micro is RLE compression.

There are numerous C examples on the net which could be easilt adapted to the ST7.

Hope this helps

SJO

sisto · ‎2003-09-01

Posted on September 02, 2003 at 05:57

Yes SJO, thanks.

Waiting to any answer from the forum people, I have already implemented an RLE encode/decode algorithm.

Respecting a B/W image of 1024 bytes ( LCD 64x128 ), I have gained a compression of about 42%.

As regards the of Shannon entropic limit, I am fairly satisfied.

Sixtus

[ Questo Messaggio Ã¨ stato Modificato da: sixtus il 02-09-2003 09:29 ]