I'll add to Richard's and Sieghard's excellent comments. I think contrast is very important in getting a reliable field of view report particularly where the four corners are concerned. Since most pages I scan are white, I saved an old TV tray top that is dark green. This makes a great surface to place my pages on before doing a KNFB field of view report. If you have a table that you know is a darker brown, that also would provide good background contrast for white pages being scanned.
Good luck. Alan Lemly Sent from my iPhone > On Oct 16, 2015, at 1:17 PM, Sieghard Weitzel <[email protected]> wrote: > > Hi Krister, > > I suggest you try out Richard's suggestion and figure out what works best for > you. I prefer to use KNFB Reader in portrait mode since it's more intuitive > for me to just put the page in front of me like I would read it, but > essentially I do the same, i.e. put the phone so the camera corner is approx. > in the middle of the page, I check to see if the left edge of the phone is > roughly parallel to the edge of the paper, then I raide the phone up a good > foot and do my thing. It's better to raise it a bit too high rather than > having it too low, a few inches more don't seem to make a difference when it > comes to accuracy of the OCR and you are more likely to have all four edges > of the page in view. > > Now, if, for example, the app tells you that the phone only sees the top and > the left edge, then you have to move the phone a bit right and down since > obviously it doesn't see those edges. > > If it says you are 10 degrees counter clockwise, then just turn the phone > slightly clockwise. You can actually test this by deliveratly turning the > phone either clockwise or counter clockwise, let's say at least 45 degrees, > so about half way between portrait and landscape. Then do a field of view > report and see what it says, now try to hold the phone more or less straight > and do it again. Compare what it said, doing it sort of by extremes can > really help to bring the point home. It doesn't matter if you turn the phone > clockwise or counter clockwise, just make sure you take notice if it says 40 > degrees clockwise and you then rotate it counter clockwise by approximately > that amount and now it says 5 degrees clockwise you know you turned it the > right way, but not quite enough, if it now says 8 degrees counter clockwise > you know you turned it the right way but a bit too much. I find that if it's > less than 5 degrees the results are usually very good since the app of course > corrects for a small amount of error. > The vibration I assume is self-explanatory, if the phone vibrates you are > holding it tipped side to side or front to back and you just have to make > very small adjustments until it stops vibrating. > > > Regards, > Sieghard > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of > Krister Ekstrom > Sent: Friday, October 16, 2015 9:21 AM > To: [email protected] > Subject: Re: A rant about KNFB Reader and my very, very small brain > > Hi and thanks for that explanation. I actually never thought about having the > document in landscape, probably because i always have the phone in portrait, > but it’s certainly well worth trying. What does that ”rotated so and so many > degrees clockwise” mean and what does it refer to? Is it the paper you should > adjust then? > /Krister > >> 16 okt. 2015 kl. 14:50 skrev Richard Turner <[email protected]>: >> >> Hi, >> Well, it sounds like at least you get a good workout while using the app, >> grin. >> >> In my opinion, the best way to get used to using the app and making sure you >> have the phone in the right position is to do the following: >> >> 1. put the page you want to scan on a table or desk in landscape mode near >> the edge of the surface closest to you. So, the long side would be toward >> you and the short sides will be pointed left to right. >> >> 2. lay the phone flat on the page pointed in the same direction as the >> page, so the long side is toward you with the corner that contains the >> camera as close to the center of the page as possible. >> If you have trouble judging where the center is, before you lay the phone on >> the page, fold the page in half the long way, unfold it and then folder it >> in half the short way and lay it back flat on the surface. That way, where >> the folds meet is the center of the page. >> Place the camera on that spot. >> >> 3. Use both hands to raise the phone straight up about one foot. I hold >> the corners of the phone with my thumbs and little fingers so my other >> fingers are pointed at each other. Some people actually put their elbows on >> the desk to help steady their hands. >> >> Once you have the phone about a foot off the page, and level, gently reach a >> finger to the field of view report button and double tap. >> A tricky movement but not too hard. The main thing it to not tilt the >> phone while doing this. >> >> After a while, you will get used to how high to raise the phone and how to >> have the camera aimed at the center so you can do it with one hand and get >> good scans. >> >> I hope that helped, >> Richard >> >> >> >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] On Behalf >> Of Krister Ekstrom >> Sent: Friday, October 16, 2015 2:07 AM >> To: [email protected] >> Subject: A rant about KNFB Reader and my very, very small brain >> >> Hello, >> I have been using the KNFB reader for a good while now and think it’s pretty >> decent. It does what it’s supposed to do i guess and does it well. This rant >> is about the one feature my stupid brain isn’t capable of comprehending, >> namely the ”field of view” report. >> >> Now i understand that this feature is quite important and that you probably >> can get excellent results out of the KNFB reader if only i understood how to >> interpret and operate the field of view thing. For example i have never, >> ever, ever made four corners visible in a document. All four edges are >> visible alright but only 3 corners are visible all the time and the rotation >> thing… No matter how i adjust the paper, twist my hands into various painful >> angles, turn the phone, turn myself or turn myself, the phone and twist my >> hands in various painful angles all at the same time, it’s always rotated so >> and so many degrees clockwise or anticlockwise and nothing seems to help >> that. How should i interpret the rotating things, they must be there for a >> reason only i’m too dumb to calculate it out for myself. Maybe i’m holding >> the phone wrong somehow, wouldn’t surprice me in the least, but i don’t know >> how to hold it ”right”. >> I would be grateful for any explanation of this so that i know what obvious >> thing i do wrong. >> /Krister >> >> -- >> The following information is important for all members of the VIPhone list. >> >> If you have any questions or concerns about the running of this list, or if >> you feel that a member's post is inappropriate, please contact the owners or >> moderators directly rather than posting on the list itself. >> >> Your VIPhone list owner is Cara Quinn - you can reach Cara at >> [email protected] >> >> The archives for this list can be searched at >> http://www.mail-archive.com/[email protected]/. >> --- >> You received this message because you are subscribed to the Google Groups >> "VIPhone" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at http://groups.google.com/group/viphone. >> For more options, visit https://groups.google.com/d/optout. >> >> -- >> The following information is important for all members of the VIPhone list. >> >> If you have any questions or concerns about the running of this list, or if >> you feel that a member's post is inappropriate, please contact the owners or >> moderators directly rather than posting on the list itself. >> >> Your VIPhone list owner is Cara Quinn - you can reach Cara at >> [email protected] >> >> The archives for this list can be searched at >> http://www.mail-archive.com/[email protected]/. >> --- >> You received this message because you are subscribed to the Google Groups >> "VIPhone" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at http://groups.google.com/group/viphone. >> For more options, visit https://groups.google.com/d/optout. > > -- > The following information is important for all members of the VIPhone list. > > If you have any questions or concerns about the running of this list, or if > you feel that a member's post is inappropriate, please contact the owners or > moderators directly rather than posting on the list itself. > > Your VIPhone list owner is Cara Quinn - you can reach Cara at > [email protected] > > The archives for this list can be searched at > http://www.mail-archive.com/[email protected]/. > --- > You received this message because you are subscribed to the Google Groups > "VIPhone" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/viphone. > For more options, visit https://groups.google.com/d/optout. > > -- > The following information is important for all members of the VIPhone list. > > If you have any questions or concerns about the running of this list, or if > you feel that a member's post is inappropriate, please contact the owners or > moderators directly rather than posting on the list itself. > > Your VIPhone list owner is Cara Quinn - you can reach Cara at > [email protected] > > The archives for this list can be searched at > http://www.mail-archive.com/[email protected]/. > --- > You received this message because you are subscribed to the Google Groups > "VIPhone" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/viphone. > For more options, visit https://groups.google.com/d/optout. -- The following information is important for all members of the VIPhone list. 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