Biofob Blue brief user guide
© Microlatch Limited
5
device name or pairing password at one time, please set the other parameter length as zero.
For example:
0x
02
00000a06
08
MyBiofobBlue
00
04
, change device name to MyBiofobBlue
0x
02
00000a06
001005
8756
04
, change pairing password as 8756
7)
Capture fingerprint image, and Sleep Then Capture fingerprint image
Scan the live finger and return the scanned image.
Data types supported by Biofob Blue:
• PT_GRAB_TYPE_381_381_8 (2) – Grab the whole finger with 3:4 sub sampling (every 4
pixels scaled down to 3 pixels, 381 x 381 DPI), 8 bits/pixel.
• PT_GRAB_TYPE_381_381_8_BINARIZED (4) - Grab the whole finger with 3:4 sub
sampling (every 4 pixels scaled down to 3 pixels, 381 x 381 DPI), 8 bits/pixel, and binarize to
1 bit/pixel.
• PT_GRAB_TYPE_381_381_8_SCAN381 (19) - Grab the whole finger with 3:4 sub
sampling (every 4 pixels scaled down to 3 pixels, 381 x 381 DPI), 8 bits/pixel. Sub sampling
is done directly by the sensor using its native 381 scanning format.
• PT_GRAB_TYPE_508_508_8_SCAN508_508_8 (34) – Grab the whole finger in full
resolution (508 x 508 DPI), 8 bits/pixel. Image is internally scanned using format 508/508/8.
The image data are received using asynchronous data transfer.
The sub sampling factor is the ratio between the full resolution (which is always 508 DPI) and
the resolution of the selected data type. E.g. for the data type PT_GRAB_TYPE_381_381_8
the sub sampling factor is 381/508 =¾. The sub sampling factor can be different for X and Y
coordinates. The image height and width is determined as the multiple of the base image size
(192x512pixels) and the sub sampling factor.
Example: A data type PT_GRAB_ TYPE_381_381_8 was used on BioBlue. Base image size
is 192x512 pixels. Sub sampling factor X = 381/508= 3/4, sub sampling factor Y = 381/508 =
3/4. The image width will be 192*3/4 = 144 pixels, image height will be 512*3/4 = 384
pixels.
Flags: Currently only one flag is defined:
BG_WAIT_GOOD_FINGER (0x01)
If set, the command verifies the quality of the finger image and returns only when the finger
quality would be acceptable for other biometric functions.
8)
Capture fingerprint data and Sleep Then Capture fingerprint data
Scan the live finger, process it into a fingerprint template and optionally return it to the Host.
This function provides a method to Enroll, Verify and Identify fingerprints on line.
Biofob Blue gets the template and sends to Host via Bluetooth, the Host then forwards it
to the authorization center via WLAN/WIFI/3G.
Purpose:
Supported values:
PT_PURPOSE_VERIFY (1); PT_PURPOSE_ENROLL (3);
PT_PURPOSE_ENROLL_FOR_VERIFICATION_ONLY (4)
Flags:
Currently only one flag is defined:
