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Adaptive thresholding
This filter converts an image to black-and-white. During conversion for each pixel a thresholding value is
determined. If the brightness is less than the threshold level, the pixel becomes white, otherwise it
becomes black. Thresholding values are determined from a set of neighbor pixels, thus allowing to
improve the recognition results, e.g. for source images with irregular background.
Value of square size
- set approximate value of character line visual thickness measured in squares. If
this value is smaller than actual typical document character line thickness, and color contrast value
within this square will be lower than threshold contrast value set in the filter, the center of the square at
binarization will become white.
On the other hand, too big square size may also lead to incorrect binarization of a pale printed
character, since light pixels of this character will be recognized as background for densely colored pixels
of other characters.
Note:
When configuring Adaptive thresholding
ing
filter, set Value of square size
e
comparable to
document character thickness.
Value of contrast
- set the difference in color and light between parts of an image.
Value of threshold
-set threshold value within the range 0% to 100%.
Preview windows controls
If the Auto preview
check-box is selected, preview image will be recalculated every time you make a
change in the dialog settings. If this box is unchecked, all changes you made will be calculated after you
click the Preview
button.
If you are performing filter configuration on a large image file it is advised to check the Quick view
box
to speed up image processing calculation. The program will choose the optimal processing algorithm.
Color dropping
This filter drops all colors of hue and brightness close to specified ones. Pixels within this color range will
be replaced by the substitute color selected in the respective Substitute color
dialog opened by clicking
the respective button in Color dropping filter
configuration dialog or using eyedropper.
You can select color for dropping in two ways:
1.
Click the Drop color
button to open the standard Windows color selection dialog.
2.
Use eyedropper. To switch to eyedropper tool, click the
button. The cursor will change to
eyedropper. Placing the cursor over the image and left clicking will select the desired color. While
the cursor looks like dropper, the
button will look pushed. To switch back to regular cursor
click this button again.
The image part with relationship ID rId536 w w as not found in the file.
The image part with relationship ID rId537 w w as not found in the file.
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Drop color, in this particular case, is a certain color range. This range is defined as a deviation from the
color selected in the color selection dialog. The deviation is percent measured. Three color parameters
are used for definition of the required deviation values: Color deviation
, Lumination
, Saturation
.
Pixels that do not enter the color range of deviation for dropping color will not be affected by the filter
application. Pixels within this color range will be replaced by the substitute color selected in the
respective Substitute color
dialog that opens by clicking the respective button in Color dropping
filter
configuration dialog. You can also use eyedropper for substitute color selection.
See Adaptive thresholding
filter configuration section for Preview
window controls.
Color extraction
This filter makes that colors with hue and brightness close to specified ones will remain, while all other
colors will be dropped and replaced by user selected color.
Configuration of this filter is similar to Color dropping
filter configuration.
You can use eyedropper tool for selecting desired color right from the preview window. See instructions
on using eyedropper tool in Color dropping
filter configuration section.
See Adaptive thresholding
filter configuration section for Preview
window controls.
Color resolution
This filter increases/decreases bits per pixel, provides dither method, palette and color order
parameters.
See Adaptive thresholding
filter configuration section for Preview
window controls.
Deskew
This filter deskews the image. It does not require a dialog for its configuration, since it does not provide
any configurable settings.
Note:
Applying this filter to straight oriented images may produce skewing effect.
Despeckle
The filter removes speckles from the image, which improves recognition results. It does not require a
dialog for its configuration, since it does not provide any configurable settings.
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Dilation
The filter allows enlarging black objects in the image, presumably text for better recognition results. You
can select to enlarge the objects in the omnidirectional, horizontal, vertical, diagonal way. Use Value
drop down list to pick the desired dilation direction.
See Adaptive thresholding
filter configuration section for Preview
window controls.
Dot remove
The filter removes dots of the specified size on 1 bit b/w document scans. You can set minimum and
maximum dot width and height in respective input boxes.
See Adaptive thresholding
filter configuration section for Preview
windows controls.
Flip
The filter flips the image. It does not require a dialog for its configuration, since it does not provide any
configurable settings.
Invert
The filter inverts all image colors. It does not require a dialog for its configuration, since it does not
provide any configurable settings.
Inverted text
The filter inverts text inside black box and removes the box itself. The dialog allows adjusting the text
box dimensions to be inverted and black color opacity degree.
See Adaptive thresholding
filter configuration section for Preview
window controls.
Line remove
The filter removes horizontal or vertical lines on the scanned 1bit black-and-white document images.
This filter might be very useful for OCR optimization of printer filled forms with misplaced text. You can
choose either to remove vertical or horizontal lines by selecting one of respective check boxes.
You can also instruct the component what kind of lines to remove. Set minimum line length, maximum
line width, and wall height in pixels using input fields provided. Walls are slices of a line that are too
wide to be considered part of the line.
See Adaptive thresholding
filter configuration section for Preview
window controls.
Resize
The filter allows changing output image size. You can select the desired resizing method and resolution
value in respective drop down lists.
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There are three resize methods available: normal
, resample
, and bicubic
.
Reverse
The filter reverses the image (left to right) to produce a mirror image. It does not require a dialog for its
configuration, since it does not provide any configurable settings.
Rotate
This filter rotates the image to a fixed angle (90, 180, and 270). You can select the desired value from
the Angle
drop down list.
See Adaptive thresholding
filter configuration section for Preview
window controls.
Sharpen
The filter increases or decreases sharpness of the image.
You can set sharpness value by moving Sharpen
slider or typing desired percent value in the input box to
the left of the scale.
See Adaptive thresholding
filter configuration section for Preview
window controls.
Stretch intensity
This filter increases the image contrast by centering, maximizing, and proportioning the range of
intensity values.
The filter does not require a dialog for its configuration, since it does not provide any configurable
settings.
Thresholding
The filter converts an image to black-and-white. All pixels with the brightness less than the specified
level (threshold) become white, the others become black.
Threshold
- set threshold value within the range 0% to 100%.
See Adaptive thresholding
filter configuration section for Preview
window controls.
Output format
This dialog allows configuring settings for saving the output file.
Save as type
- select the format of the output file. See the list of supported output formats in the
Restrictions and limitations
section.
Note:
Not all formats have a multipage support. If the component receives a multipage document on
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input and converts it to another format that does not have a multipage support, the
component will generate a separate output document for each page of the input document.
These documents will have the same name as the input document with an index added, for
example, inputdocname_1.jpg
g
, inputdocname_2.jpg
g
.
BPP
- select color depth in bpp used to save the output file.
Subfile type
- select a subfile type from the drop down list. This setting is enabled only for some
formats.
QFactor
- specify value of an option to determine the degree of loss in the compression process. This
setting is enabled only for some formats. Commonly, the QFactor is a numeric value that varies in the
range 2-255, however there are some exceptions to this rule and some special predefined values for
some formats. If the format has such predefined values of QFactor, you can select one of them using the
combo-box. If QFactor takes only numeric values from given range, its value can be set using the text
box. The below table lists the non-standard QFactor values for different formats:
Format
QFactor values
JPEG 16 BPP
0 only
LEAD CMP
2-255
(-1) Perfect quality 1
(-2) Perfect quality 2
(-3) Quality far more important than size
(-4) Quality more important than size
(-5) Quality and size equally important
(-6) Size more important that quality (sharp)
(-7) Size more important than quality (less tiling)
(-8) Maximum compression keeping quality
(-9) Maximum compression
PNG
0-9
ABC, TIFF with ABC compression (0) Lossless compression
(1) Virtual Lossless compression
(2) Remove Border compression
(3) Enhance compression
(4) Modified1 compression
(5) Modified1 fast compression
(6) Modified2 compression
(7) Modified2 fast compression
(8) Modified3 compression
(9) Modified3 fast compression
(10) Lossless fast compression
(11) Lossy fast compression
ECW
1-100
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Progressive options
- using this option, you can save multiple representations of image at different
resolutions without any extra storage overhead. The image will be saved in the low-resolution in the
first pass; subsequent passes will improve the resolution. Specify the number of passes that are required
to complete the image. This setting is enabled only for some formats.
Progressive order
- select the order of progression from the drop-down list. This setting is enabled only
for some formats.
Compression
- select the method that should be used for determining the compression. This setting is
enabled only for some formats. The compression method may be one of the following:
•
Lossless
- compress the file without loss.
•
Compression Ratio
- compress the file based on the value entered in the Comp. ratio
text box
that becomes enabled.
•
Target File Size
- compress the file based on the value entered in the Target size
field that
becomes enabled.
•
Quality Factor
- compress the file based on the quality factor specified in the QFactor
combo box
or text box.
J2K options
- this button becomes enabled when you save a file in the JPEG 2000 format. Click this
button to configure the JPEG 2000 file options in the opened Advanced JPEG 2000 Options
dialog.
Advanced JPEG 2000 Options
This dialog allows you to determine the settings for saving JPEG 2000 files.
Offset
group allows setting the offset of the image from the origin of the reference grid.
•
Horizontal
- enter horizontal offset from the origin of the reference grid to the left side of the
image area.
•
Vertical
- enter vertical offset from the origin of the reference grid to the top of the image area.
Tile Size
group allows setting the size of a reference tile.
•
Width
- enter width of one reference tile, with respect to the reference grid. The default value is
1000000.
•
Height -
enter height of one reference tile, with respect to the reference grid. The default value is
1000000.
Tile Offset
group allows setting the offset of the first tile from the origin of the reference grid:
•
Horizontal
- enter horizontal offset from the origin of the reference grid to the left side of the first
tile.
•
Vertical
- enter vertical offset from the origin of the reference grid to the top of the first tile.
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General Settings
group allows configuring the general image encoding settings.
•
Use Color Transform
- select this check box to convert an RGB image to YUV space before
compressing. (YUV space provides greater compression with higher image quality.)
•
Use Derived Quantization
- select this check box to use derived quantization or expounded
quantization.
•
Decompress Level
- enter number of resolution levels in the compressed file. The maximum
number of levels depends on the size of the image. Passing values that are too large will cause
the save operation to fail. Each resolution level is one-half the size of the previous resolution,
starting with the full image resolution. The default value is 5.
•
Guard Bits
- enter the number of extra bits to consider when encoding an image. This prevents
coding overflow. Possible values are 0 - 7. The default is 2.
Markers
group allows indicating which markers should be used.
•
Use SOP Marker
- select this check box to use the SOP marker.
•
Use EPH Marker
- select this check box to use the EPH marker.
Code Block
group allows you to set the size and options for code blocks.
•
Width
- enter width of the code block, following wavelet transformation. The value must be a
power of 2. It must be at least 4 and less than or equal to 1024. The default value is 64.
•
Height
- enter height of the code block, following wavelet transformation. The value must be a
power of 2. It must be at least 4 and less than or equal to 1024. The default value is 64.
You may select one or several options from the following list:
•
Selective AC bypass
•
Reset Context On Boundaries
•
Termination On Each Pass
•
Vertically Causal Context
•
Predictable Termination
•
Error Resiliences Symbol
Derived Base
group allows setting a base for derived quantization.
•
Mantissa
- enter the base mantissa used for derived quantization.
•
Exponent
- enter the base exponent used for derived quantization.
Alpha Channel
group allows setting the alpha channel information to indicate level of transparency.
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