29.7cm (A4 format) sheet, the camera will see the entire page at a distance of
11 to 13 inches or 27 to 32 cm.
To take a picture touch the left side of the screen, and VoiceOver should say:
“take picture.” Then you can gently double tap anywhere on the left-hand side
of the screen and the camera will respond with the distinctive sound of the
For best results, to avoid jiggling the phone while the picture is taken, try using a
split tap command where two fingers are planted firmly on the left-hand side of
the screen and then lift one finger to snap the picture. Hold the device steady
until you hear the camera shutter sound.
The image is processed for text. If any is found, the text is displayed
automatically and read aloud as the Text Navigation screen opens. To pause or
resume reading, double tap with two fingers together. Use the VoiceOver rotor
and standard gestures to navigate through the text or additionally by using the
navigation controls located at the bottom of the screen.
To save the document, activate the Save Document button located just above
the recognized text in the right-hand corner of the screen. To return to Image
Capture for taking another picture, activate the Back button or perform the
VoiceOver scrub gesture to go back.
Sharp pictures are essential for optimal performance. Hold the device steady by
using both hands and brace your elbows on the reading surface, while still
keeping the device far enough from the document to capture all the text. For
best results, place the text you want to read on a flat surface in front of you.
Flatten the document as much as possible. Keep the device level over the page.
Fill the screen with the view of the document you want to capture.
To confirm your camera position or learn the feel of a well lined up picture, use
the Field of View Report option. You can activate the Field of View Report by
double tapping or split tapping the right-hand side of the screen and holding the
device still to listen to the report; you can then adjust the position of the device
above the page and repeat the process as needed. The goal is to have the device
close to the document but still far enough away that all four edges of the
document are seen by the camera.
Practice will help in the beginning. Use a familiar document printed in clear type
on an 8 and one half by 11 inch (letter format) or 21 by 29.7 cm (A4 format)
white sheet of paper for your initial practice sessions. Place the document on a
flat surface having a plain dark, not shiny background. After some practice with
aiming and taking pictures you will begin to know how the KNFB Reader app
responds. You will also be better prepared to analyze and correct conditions you
can control when performance does not measure up. A little practice and
persistence can greatly improve performance.
This guide will instruct you on navigating the KNFB Reader app on your iDevice
using the built-in gesture-based screenreader called VoiceOver. An overview of
how to use VoiceOver in iOS can be located by navigating to the VoiceOver for
iOS page on the Apple website
https://www.apple.com/accessibility/osx/voiceover/ . This document assumes
that the user has basic knowledge of how to navigate using VoiceOver and does
not serve as a replacement for VoiceOver training.
Instructions for navigating the KNFB Reader app may reference the following
basic VoiceOver gestures.
● Flick left/right with one finger: move backward or forward by
● Flick down/up with one finger: Moves forward or backward using the
currently selected element set by the VoiceOver rotor
● Double tap with one finger: activate the control currently in focus
● Split tap using two fingers: placing two fingers on the screen and
lifting one performs the action of a double tap
● Flick left/right with three fingers: moves forward or backward
through a document by page
● Double tap with two fingers: Pause and Resume speech
● Double tap with four fingers: Toggle VoiceOver help
Image Capture screen.
The KNFB Reader app opens to the Image Capture screen but several other
screens are also used for reading text and performing other functions in the
app. Think of the image capture screen as the home screen for the app. To
activate a control or to change a setting, with VoiceOver enabled, double tap
with one finger or use a split tap command for best results when taking pictures.
The next few sections will discuss using the controls on the image capture
screen in greater detail.
When the KNFB Reader app is launched for the first time, the VoiceOver focus
will be on the “Take Picture” button. The controls on this screen going from left
to right, and top to bottom in VoiceOver swipe order are as follows.
● File Explorer
● Camera Flash
● Tilt Guidance
● Take Picture
● Field of View Report
● Buy unlimited version (only when
still in trial mode)
● Add picture from library
● Batch Mode
● OCR Language
● Document Type
● Select Profile
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File Explorer—on Image Capture screen in the upper left-
The “File Explorer” screen is where your
saved files are located. Double tap on the
“File Explorer” button to access the File
Explorer screen. Activate the back button to
return to the previous screen. Files are listed
by date with the newest file appearing first
and the oldest appearing last in the list. Use
voice-over actions or double tap the edit
button to access additional file management
related actions including export options,
renaming, and deleting saved documents.
Saved documents may also be deleted using
a flick up gesture followed by a double tap
with the actions item selected in the
PDF and image files.
PDF and jpg files may be imported in to the KNFB Reader app for text processing
using the open with function. This means that if you have an image-based pdf or
jpg file that you know contains text, importing the file in to the KNFB Reader app
will enable you to rapidly process the file and extract any text and have the
contents read aloud and available in Braille.
A sample workflow for extracting text from a pdf or jpg file would function as
● Navigate to a pdf or jpg email attachment
● Using the share option, open the file in the KNFB Reader app
● Double tap on the imported file and activate the scan button to
extract text to be read aloud.
Settings button—located on Image Capture screen swiping
right from File Explorer.
The settings screen consists of three tabs with various controls for changing the
way the app functions. Accessing specific settings in any of the tabs may be
accomplished by double tapping on the desired tab to select it. To exit settings
and return to the image capture screen, activate the back button located on the
top left of the screen.
Moving from left to right, the tabs on the settings screen are as follows.
● General tab
● Text tab
● About tab
The general tab is devided in four types of settings: Camera, Reader, File
Manager and Dropbox backup settings.
The Camera settings part contains two switch buttons which are flashlight is
always on and Field of view landscape mode
In the Camera settings you also find a button Select OCR languages. Hitting this
button brings you in a new screen in which you can select or deselect the OCR
languages you want KNFBReader to offer you in the OCR-language picker on the
Take Picture screen.
The Reader settings part of the General Tab contains three switch buttons:
Automaticly start reading, Allow reading in background and Allow word
The flashlight setting, when enabled, will turn on the LED light located next to
the back camera, which you can use as a light source for taking pictures in the
dark or in low-light conditions. Please keep in mind that when the flashlight is
enabled for long periods of time, the battery may drain faster.
The Automatically start reading button determines whether or not text will be
read immediately after the image is captured and text is available. This setting is
enabled by default. Disabling it will cause the KNFB Reader app to seem slower
since the page needs to fully process before text can be read with VoiceOver.
The Allow reading in background toggle determines whether or not speech
stops when switching the app to standby.
As last item the Reader settings contains a button Select Reading languages.
Hitting this button brings you in a new screen in which you can select or
deselect the reading languages you want KNFBReader to offer you in the
Document language picker on the Reader screen. If you find a more info label
next to a language you want to select, then you have a choice between two or
more variants of that language, for instance US and UK English. Tapping the
more info label will bring you in a new screen where you can make your choice
between the language variants.
In the File Explorer settings part you will find a switch-button labeled Confirm
before deleting. When switched to on the system will always ask confirmation
before deleting a file.
In the Dropbox Backup settings part you will find a switch-button labelled Link to
Dropbox. When switching this button to ON you end up in a Dropbox dialog that
asks you to allow access by the KNFB Reader app to the files and folders in your
Dropbox. Allow access or select another Dropbox account for backup.
Once you have allowed access to the Dropbox account, all KNFB files are saved
to a Dropbox folder named KNFB. You will find this folder in the root of your
Dropbox folder. From now on these KNFB files on Dropbox will be synchronized
with the KNFB files on your device. If for instance you add a page to a document,
then that page will also be added to the document in the Dropbox folder. Now
you can use the Dropbox folder to retrieve individual files. To do this you open
your Dropbox app, go to the folder KNFB and go to the file you want to retrieve.
Select open in KNFB Reader to retrieve the actual file. If you delete a file on your
device, then it will not be deleted in the Dropbox folder, so that it is still there
for later use.
Once you have allowed access to the Dropbox account you will also find two
extra buttons. The button Backup all KNFB files to Dropbox and the button
Restore all KNFB files from Dropbox.
After tapping the button Backup all KNFB files to Dropbox a zip containing all
KNFB files on your device is saved in the Dropbox folder named KNFB.
The backup file is used by the restore feature to place all files back to your
device. To do this, double tap on the button Restore all KNFB files from Dropbox
and all KNFB files on your device will be deleted and replaced by the files in the
backup from Dropbox.
When the settings screen is activated, the
Text tab is automatically selected.
The Text tab contains two categories of
settings which are indicated by headings,
for changing the way text is displayed on
screen. The two headings are text settings
and highlight settings.
Text settings include
● Font type
● Font size
● Text color
● Text Background color
● Line distance
Highlight settings include
● Highlight text color
● Highlight background color
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