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EmptyPageDetectionParams Object (IEmptyPageDetectionParams Interface)

This object allows you to tune the parameters of empty page detection with the help of the FRPage::IsEmpty method.

You can set the maximum number of different types of objects which still allows the page to be considered empty. If for any one of these types more objects are found on the page than the limit you specify, the page will not be considered empty, and the IsEmpty method will return FALSE.

The EmptyPageDetectionParams object is a persistent object. This means that the object's current state can be written to persistent storage on disk. Later, the object can be re-created by reading the object's state from persistent storage. The following methods provide persistence of the object: SaveToFile, and LoadFromFile.

Properties

Name Type Description
Application Engine, read-only Returns the Engine object.
Main settings
MaxAlphabetLetters int

Specifies the maximum number of letters belonging to the recognition languages' alphabets found on the page, for which it can still be considered empty. It can take values from -1 (which means that the letter limit is not used) to 100.

The default value of this property is 2.

MaxBlackPercentage int

Specifies the maximum percentage of black areas on the page, for which it can still be considered empty. It can take values from -1 (which means that the black percentage limit is not used) to 100.

The default value of this property is -1, and the black percentage is not used during empty page detection.

MaxTextObjects int

Specifies the maximum number of text objects found on the page, for which it can still be considered empty. It can take values from -1 (which means that the text object limit is not used) to 100.

The default value of this property is 20.

NeedCheckBarcodes VARIANT_BOOL

Specifies if the page must be searched for barcodes. If you set this property to TRUE, the page will be additionally checked for barcodes even if it was considered empty by other criteria. If any barcodes are found, the page will be considered not empty.

The default value of this property is FALSE.

UseMargins VARIANT_BOOL

Specifies if the LeftMargin, TopMargin, RightMargin, BottomMargin properties must be used for determining the page rectangle. If this property is set to FALSE, the page rectangle is determined automatically, regardless of the ...Margin properties.

The default value of this property is FALSE.

Page margins
LeftMargin int

Specifies the width of the left margin, which must not be considered when determining if the page is empty. It can take values from 0 to 300 (in millimeters).

The default value of this property is 0.

TopMargin int

Specifies the width of the top margin, which must not be considered when determining if the page is empty. It can take values from 0 to 300 (in millimeters).

The default value of this property is 0.

RightMargin int

Specifies the width of the right margin, which must not be considered when determining if the page is empty. It can take values from 0 to 300 (in millimeters).

The default value of this property is 0.

BottomMargin int

Specifies the width of the bottom margin, which must not be considered when determining if the page is empty. It can take values from 0 to 300 (in millimeters).

The default value of this property is 0.

Methods

Name Description
CopyFrom Initializes properties of the current object with values of similar properties of another object.
LoadFromFile Restores the object contents from a file on disk.
SaveToFile Saves the object contents into a file on disk.

Output parameter

This object is the output parameter of the CreateEmptyPageDetectionParams method of the Engine object.

Input parameter

This object is passed as an input parameter to the IsEmpty method of the FRPage object.

See also

ObjectsExtractionParams

03.07.2024 8:50:25

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