I just committed dynamic thresholding to git. 1 bit B/W scans can be controlled by following options: - threshold - threshold-curve - gamma
Dynamic thresholding uses a look up table of thresholds. The table is generated for each scan from the parameters threshold-curve as slope and threshold as offset. Cheers, Rolf Am 03.02.2012 22:40, schrieb m. allan noah: > Cool. You might also want to look at the dynamic thresholding code I > added to the epjitsu backend. Stef was able to copy it to genesys as > well. Basically adds a sliding window and some hysteresis to the > threshold determination, brings out text on gray backgrounds and such. > I'd like to add it to sanei_magic someday, but don't have the time > right now. > > allan > > On Fri, Feb 3, 2012 at 4:31 PM, Rolf Bensch<rolf at bensch-online.de> wrote: >> Hello, >> >> I just commited 1 bit B/W lineart for all scanners in the pixma_mp150 and >> pixma_mp810 subdrivers to the git tree. >> >> Due to the fact that these ccd scanners doesn't support generic lineart, I >> implemented software-lineart. The graphic frontend (Xsane) provides a slider >> to set the threshold. >> >> pixma_mp810 subdriver has been tested well with these scanners: >> >> Canoscan 8800F >> Canoscan 9000F >> Canon Pixma MP810 >> Canon Pixma MP960 >> >> pixma_mp150 subdriver isn't tested yet. This code should run, because it is >> similar to the pixma_mp810 code and I compared the diff files. >> >> Please report other working scanners to the ML. >> >> Cheers, >> Rolf >> >> -- >> sane-devel mailing list: sane-devel at lists.alioth.debian.org >> http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/sane-devel >> Unsubscribe: Send mail with subject "unsubscribe your_password" >> to sane-devel-request at lists.alioth.debian.org > > >
