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The appropriate settings can be selected directly from the image Opening or Scanning dialog boxes
(when using the ABBYY FineReader interface to scan documents) and on the Scan/Open tab of the
Options dialog box (Tools>Options…).
Important! Any program setting changes made in the Options dialog box require re–scanning or
re–opening the image. These steps are required to processyour image under the new settings.
The following settings are available on the Scan/Open tab of the Options dialog box:
•
Launching automatic analysis and recognition of the retrieved images
ABBYY FineReader is by default set to analyze and recognize documents automatically.
These settings can be modified as needed. The following options are available:
•
Automatically read acquired page images
Document analysis and recognition will be performed automatically.
•
Automatically analyze acquired page images
Document analysis will be performed automatically, and recognition will require the user's
attention.
•
Do not read and analyze acquired page images automatically
The scanned or opened images will be added to the FineReader document. The user will
have to initiate document analysis and recognition manually. This mode is used for
processing documents with a complex structure.
•
Image processing methods
•
Enable image preprocessing
Enable image preprocessing if you need to OCR a book or a digital photo of a text
document. When activated, this feature automatically decides what action to take depending
on the input image type and applies the correction. Adjustments include removing noise
from digital photos, deskewing, removing motion blur, straightening text lines, and
correcting trapezium distortions.
•
Detect page orientation
Enable this feature to automatically detect the orientation of pages added to the FineReader
document.
•
Split facing pages
Enable this feature when scanning a facing or opening dual pages. It will automatically split
pages before adding them to the FineReader document.
Note: The image preprocessing features are only available in the Image Editor dialog box
(Page>Edit Page Image...) to process the images opened in FineReader, and are not
available while scanning or opening document pages. For details, see "Editing Images".
•
The scanner interface to be used while scanning
Selecting the Scanning Interface
By default, ABBYY FineReader uses its own scanning dialog box to adjust scanning options. If, for
some reason, the ABBYY FineReader scanning dialog box is incompatible with your scanner model,
the scanner's dialog box is used.
1. ABBYY FineReader scanning dialog box
In this case, the ABBYY FineReader interface is used to set up scanning mode. The following
settings are available:
•
Resolution, Brightness, and Scanning Mode
•
Image preprocessing options:
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a. Detect page orientation (enable this feature to automatically detect page orientation
while scanning)
b. Split facing pages (enable this feature to automatically split facing pages into separate
images)
c. Enable image preprocessing (enable this feature to perform automatic processing of
scanned images)
•
Multi–page document scanning options:
a. Use the Automatic Document Feeder (ADF)
b. Apply automatic duplex scanning (if supported by the scanner)
c. Set the page scanning delay in seconds
Note: The Use ABBYY FineReader interface option may not be available for some
scanner models.
2. TWAIN or WIA interface provided by the scanner
In this case, scanning options are selected from the scanner driver's dialog box. Consult the
technical documentation provided with the scanner for more information about the dialog box and
its components.
Important! Consult the scanner manual for proper setup. Make sure to install the software
supplied with the scanner.
The ABBYY FineReader scanning interface is used by default.
To change the scanning interface:
1. Open the Options dialog box from the Scan/Open tab (Tools>Options… ).
2. Set the toggle switch in the Scanner group to either: Use ABBYY FineReader interface or Use
native interface.
Scanning Tips
You can set the scanning options in the ABBYY FineReader scanning dialog box or in the scanner
driver dialog box. See the "Selecting the Scanning Interface" section for more information about the
dialog box.
•
Make sure that your scanner is connected properly and switched on.
Consult your scanner documentation to ensure it is set up correctly. Be sure to install the software
provided with your scanner. Some scanner models must be switched on before you power up the
computer.
•
Place your documents face down on the scanner, making sure they are properly adjusted. Skewed
images may be converted incorrectly.
•
Printed documents are best scanned in grayscale at 300 dpi.
Conversion quality depends on the quality of the original document and scanning parameters. Poor
image quality may have an adverse effect on the quality of conversion. Be sure to select the
scanning parameters appropriate for your document.
More information about some of the scanning options is available in these sections:
•
Tuning Brightness
•
Font is Too Small
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ABBYY FineReader 11 User’s Guide
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•
Adjusting Image Resolution
•
Scanning Facing Pages
Tuning Brightness
ABBYY FineReader will display a warning message during scanning if the brightness setting is
incorrect. You may also need to adjust the brightness setting when scanning in black–and–white
mode.
To adjust the brightness:
1. Click the Scan button.
2. In the dialog box, specify the desired brightness.
Depending on which scanning interface is being used, either the ABBYY FineReader scanning dialog
box or the scanner driver dialog box will open. A medium value of around 50% should suffice in
most cases.
3. Proceed to scan the document.
If the resulting image contains too many "torn" or "glued" letters, troubleshoot using the table
below.
Your image looks like this
Recommendations
This image is suitable for OCR.
characters are "torn" or very light
•
Lower the brightness to make the image darker.
•
Scan in grayscale. Brightness will be tuned
automatically.
characters are distorted, glued together,
or filled
•
Increase the brightness to make the image
brighter.
•
Scan in grayscale. Brightness will be tuned
automatically.
Font is Too Small
For optimal OCR results, scan documents printed in very small fonts at higher resolutions.
1. Click the Scan button.
2. In the dialog box, specify the desired resolution.
Depending on which scanning interface is being used, either the ABBYY FineReader scanning dialog
box or the scanner driver dialog box will open.
3. Proceed to scan the document.
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ABBYY FineReader 11 User’s Guide
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You may wish to compare the images of the same document obtained at different resolutions by
opening them in the Zoom window in Pixel–to–Pixel mode (View >Zoom
Window>Scale>Pixel–to–Pixel).
Source image
Recommended resolution
300 dpi for typical texts (printed in fonts of size 10pt or larger)
400–600 dpi for texts printed in smaller fonts (9pt or smaller)
Adjusting Image Resolution
OCR quality is affected by the resolution at which documents are scanned. Low resolutions may
adversely affect the quality of OCR.
We recommend scanning documents at 300 dpi.
Important! For best OCR results, vertical and horizontal resolutions must be the same.
Setting the resolution too high (over 600 dpi) increases the recognition time. Increasing the
resolution does not yield substantially improved recognition results. Setting an extremely low
resolution (less than 150 dpi) adversely affects OCR quality.
You may need to adjust the resolution of your images if:
•
The resolution of your image is less than 250 dpi or higher than 600 dpi.
•
The resolution of your image is non–standard.
For example, faxes may have a resolution of 204 x 96 dpi.
To adjust the resolution:
1. Click the Scan button.
2. Depending on the scanning interface used, the ABBYY FineReader interface or the scanner driver
interface will appear.
Choose the desired resolution in the scanning dialog box.
3. Scan the document.
Tip. You can also adjust the resolution in the Image Editor (Page>Edit Page Image…).
Scanning Facing Pages
When scanning facing pages from a book, both pages will appear in a single image.
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ABBYY FineReader 11 User’s Guide
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To improve OCR quality, split the facing pages into two separate images. The program features a
special mode that automatically splits two facing pages into two separate images in the ABBYY
FineReader document.
Scanning facing pages or dual pages:
1. Open the Options dialog box from the Scan/Open tab (Tools>Options… ).
2. Check the Split facing pages option in the Image Processing group.
3. Scan the pages.
The automatic splitting option is also available in the image opening dialog (File>Open PDF
File/Image…) and ABBYY FineReader's scanning dialog box. For details, see Selecting the
Scanning Interface.
Important! If the image contains text in Chinese or Japanese, use the Edit Image dialog box to
split pages manually. These types of images are not supported by the automatic page splitting
feature.
To split facing pages manually:
1. Open the Edit Image dialog box (Page>Edit Page Image… ).
2. Use the options in the Split group to split the page.
Taking Photos of Documents
•
Camera Requirements
•
Lighting
•
Taking Photos
•
When you need to take another photo
Camera Requirements
Your camera should meet the following requirements in order to obtain document images that can
be reliably recognized.
Recommended camera characteristics
•
Image sensor: 5 million pixels for A4 pages. Smaller sensors may be sufficient for taking pictures of
smaller documents such as business cards.
•
Flash disable feature
•
Manual aperture control, i.e. availability of Av or full manual mode
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•
Manual focusing
•
An anti–shake system or ability to use a tripod
•
Optical zoom
Minimum requirements
•
Image sensor: 2 million pixels for A4 pages
•
Variable focal distance. Fixed–focus cameras (lens focused on infinity) should not be used to
photograph documents. These types of camera are commonly built into mobile phones and PDAs.
Note: For detailed information about your camera, please refer to the documentation supplied with
your device.
Lighting
Lighting greatly affects the quality of the resulting photo.
Best results can be achieved with bright and evenly distributed light, preferably daylight. On a
bright sunny day, you can increase the aperture number to get a sharper picture.
Using flash and additional light sources
•
When using artificial lighting, use two light sources positioned so as to avoid shadows or glare.
•
If there is enough light, turn the flash off to prevent sharp highlights and shadows. When using the
flash in poor lighting conditions, be sure to take photos from a distance of approximately 50 cm.
Important! The flash must not be used to take pictures of documents printed on glossy
paper. Compare an image with galre with a good quality image:
If the image is too dark
•
Set a lower aperture value to open up the aperture.
•
Set a higher ISO value.
•
Use manual focus, as automatic focus may fail and cause blur.
Compare an image that is too dark with a good quality image:
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Taking Photos
To obtain good quality photos of documents, be sure to position the camera correctly and follow
these simple recommendations.
•
Use a tripod whenever possible.
•
The lens should be positioned parallel to the page and look towards the center of the document. The
distance between the camera and the document should be selected so that the entire page fits
within the frame when you zoom in. In most cases this distance will be between 50 and 60 cm.
•
Even out the paper document or book pages (especially in the case of thick books). The text lines
should not be skewed by more than 20 degrees, otherwise the text may not be converted properly.
•
To get sharper images, focus on a part of the image between the center of the document and one of
its edges.
•
Enable the anti–shake system, as longer exposures in poor lighting conditions may cause blur.
•
Use the automatic shutter release feature. This will prevent the camera from moving when you press
the shutter release button. The use of automatic shutter release is recommended even if you use a
tripod.
When you need to take another photo
Please make sure that your camera meets the technical requirements and follow the simple
recommendations provided in the "Lighting" and "Taking Photos" sections.
How to improve an image, if:
•
the image is too dark and too soft
Solution: Try to use brighter lighting. Otherwise, set a lower aperture value, i.e. open up the
aperture.
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ABBYY FineReader 11 User’s Guide
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•
the image is not sharp enough
Solution: Autofocus may not work properly in poor lighting or when taking pictures from a close
distance. Try using brighter lighting. If this does not help, try focusing the camera manually.
If the image is only slightly blurred, try the Photo Correction tool that is available in the Image
Editor. For more information, see the "Editing Images Manually" section.
•
only part of the image is blurry
Solution: Try setting a higher aperture value. Take pictures from a greater distance at maximum
optical zoom. Focus on a point between the center and the edge of the image.
•
flash causes glare
Solution: Turn off the flash or try using other light sources and increasing the distance between the
camera and the document.
Automatic Image Preprocessing
OCR quality may be affected by distorted text lines, document skew, noise, and other defects
commonly found on scanned images and digital photos.
ABBYY FineReader offers an image preprocessing feature to deal with image defects of this kind.
When activated, the image preprocessing feature automatically decides what action to take
depending on the input image type and applies the correction. Adjustments include removing noise
from digital photos, deskewing, straightening text lines, and correcting trapezium distortions.
Note: These operations can be very time consuming.
To activate automatic preprocessing when images are scanned and opened:
1. Open the Options dialog box (Tools>Options… ).
2. Make sure to check the Enable image preprocessing option on the Scan/Open tab in the
Image Processing group.
Important! The automatic preprocessing option may also be toggled in the image opening dialog
box (File menu>Open PDF File/Image… ) and in the ABBYY FineReader scanning dialog box. For
more information, see Selecting the Scanning Interface.
Note: If the Enable image preprocessing option was turned off while scanning or opening
images, the image can be processed manually using the Edit Image dialog box.
Editing Images Manually
ABBYY FineReader 11 offers automatic image preprocessing, which means that the program decides
if any correction is needed and applies it to the image.
However, some images may require manual editing. For example, when only a part of an image
needs to be recognized or if you need to process only some of the pages in a document.
To edit an image:
1. Select Page>Edit Page Image…
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In the Image Editor, the active page of the current ABBYY FineReader document is
displayed on the left and the image editing tools are shown on the right.
2. An overview of the image editing tools:
•
Deskew corrects image skew.
•
Photo Correction straightens text lines, removes motion blur, and reduces noise.
•
Correct Trapezium Distortions corrects perspective distortions.
When you select this tool, a frame with grid lines is superimposed on the image. Drag and
drop the corners of the frame to position them in the corners of the page image. Make sure
that the horizontal grid lines run parallel to the lines of text. Then click Correct This
Image.
•
Rotate & Flip rotates the image and flips it left to right or right to left so that the text
appears in the normal reading position (i.e. lines are horizontal and are printed left to right).
•
Split splits the image (e.g. facing pages) into separate units.
•
Crop is used to crop the unneeded edges of an image.
•
Invert enables standard inversion of document colors (dark text against light background).
•
Image Resolution changes image resolution.
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