Finger Image¶
A FingerImage object contains a fingerprint image and additional data, including:
Raw data
Image information
Height and width
Horizontal and vertical resolution
Impression type
Position of the finger
Image quality
Detected fingers list
Capture device information
Certification
Technology
Type identifier (vendor-specific)
Vendor identifier (registered by IBIA)
A FingerImage also provides functionality for loading and storing image files into various formats, including BMP, JPEG and WSQ (see below).
Note
Several images from one or more fingers can be grouped into a single FingerImageRecord Class.
It can be stored in a supported standard format for further usage. See Supported Formats for details.
Creating a FingerImage from a file or a buffer¶
To create a FingerImage, use one of the following methods:
Method |
Description |
|---|---|
Creates a FingerImage from a specified data buffer. |
|
Creates a FingerImage from a specified file. |
|
Creates a FingerImage from a specified data buffer containing the raw image data (8-bit grayscale). |
Saving a FingerImage to a file¶
To save a FingerImage to a file in one of the supported formats, proceed as follow:
call the FingerImage.toFile Method.
If standardized biometric data interchange format is needed (ISO/IEC 19794-4 or ANSI INCITS-381), proceed as follow:
create a FingerImageRecord,
add the FingerImage to the record,
save the record to a file in the required format.
Managing multiple fingeprints of the same user¶
FingerImageRecord objects allow you to load and store information from multiple finger images using standardized biometric data interchange formats. Each record corresponds to a single subject, facilitating the exchange and comparison of finger image data.