This activity determines whether an image comes from a blank page. It examines all TIFF and JPEG media of the root document and all sub-documents (recursively). The result is recorded in the flag of the page and the medium. Many XBOUND activities can skip processing of these blank pages, when configured to do so.
For the
experts: How the algorithm works
Tip: Use the link to test the results of your settings.
Note: This activity must be assigned to an Activities Service in order to run.
If for some reason you need to add this activity to the Process Designer, the file to add is xboundActClassifyEmptyPages.dll.
The following settings are available when configuring a process step of this activity type.
Properties tab | |
How many areas the recognition algorithm operates in. Specifying more areas can improve the result, but it takes more time. | |
If a medium is larger than the specified size, it is not analyzed. | |
Checks only TIFF media. | |
Checks only back pages. | |
When a page is classified as an empty page, it is canceled (it is excluded from further processing in XBOUND). | |
Specifies whether the image is to be binarized before processing. You must select this setting when detecting empty pages in color or grayscale images such as JPEG. The binarization applies only in this step and does not affect any other process steps. | |
Select a document type to assign to the medium if it is determined to be an empty page. | |
Threshold setting for detecting empty pages (horizontal direction). The recommended value is 0.5. | |
Threshold setting for detecting empty pages (vertical direction). The recommended value is 2.5. | |
This function compares non-empty back pages with front pages on the pixel level so that any pixels that are showing through to the opposite side can be excluded. It is recommended only for standardized types of documents, when paper is thin and somewhat transparent. Note: This function does not perform a cohesive analysis of the image content. Therefore, it must be carefully calibrated using actual images to be processed, and then tested extensively, before use in production. Note: The function does not show the results of this option. | |
This parameter specifies how many pixels
the front page image is to be "fattened up" before the
algorithm is applied. To fatten
up means that all of the black figures are made bigger
by n pixels in all directions.
( | |
Advanced tab | |
Excludes a margin of this width from recognition. | |
The unit of the margin size. |
These settings are also available:
button | Imports settings from an XML file that was previously created using . |
button | Exports the settings to an XML file. Specify the file name and location. You can then import the XML file to get the same settings. See Exporting and importing process step settings. |
link | Opens a test form, where you can (when applicable) check a regular expression. |