Krister, When using the Field of View report, it is not necessary to receive a zero degree rotation.
My experience has been that as long as I get either a plus or minus 6-8 degree rotation, I take the picture and have excellent results. Why is the degree of rotation important. The short anser is that, generally speaking, the less rotation, the better the OCR. However, all things being equal, that is to say, the font is large enough and the paper contrast is good enough, etc, the app can recognize most text without a zero degree rotation. If, however, you were scanning a document that used extremely stylized text or that was very, very small or that had a reflective serfice, then a smaller degree of rotation may give you better OCR results Oh, to your original question, the degree of rotation is based on a clock. So, if you receive a message a plus 7 degrees clockwise rotation message, during the field of view report, then rotate the phone a little bit counterclockwise, that is to say, from right to left, as though you were counting down or backward on a analog clock face. Finally, I find that I can usually get the photo in one shot if I stand, rather than sit, when using the app. Of course, I do have some vision and doubtless this is a tremendous advantage when taking a photo. Mark -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Alan Lemly Sent: Friday, October 16, 2015 11:12 AM To: [email protected] Subject: Re: A rant about KNFB Reader and my very, very small brain 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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