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AET65 API
Version 1.0
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Page 60 of 84
Page 60 of 84
6.6. ABS_PKEY_IMAGE_FORMAT Values (ABS_PVAL_IFMT_xxxx)
Possible image formats.
Please note that the desired image format is always evaluated in a strict mode of raw grab profile.
Note that the symbolic constant names contain some marginal parameters of the desired format: horizontal
and vertical resolution in dots per inch (DPI), bits per pixel (they determine color count of the resulted sample
image).
Remember that the structure ABS_IMAGE always uses one byte per pixel, regardless of the desired image
format. (The image uses more compact representation during communication between the FM device and
computer.)
Some image format contains word BINARIZED in the symbolic constant name. In this case the image is
binarized yet on the device (with the exception of SONLY), so that the communication is faster.
Note that support for the particular image format depends on exact firmware version and whether the device
was calibrated. Especially low power modes may require calibration. Therefore the information in the table
below what FM models support which format is only for basic orientation.
ABS_PVAL_IFMT_381_381_8 2
Finger is grabbed with 3:4 sub-sampling (every 4 pixels scaled down to 3 pixels), 381 x 381 DPI, 8
bits/pixel.
Supported by TFM, ESS, SONLY and TCD 50.
ABS_PVAL_IFMT_254_254_8 3
Finger is grabbed with 1:2 sub-sampling (every second pixel), 254 x 254 DPI, 8 bits/pixel.
Supported by TFM and ESS.
ABS_PVAL_IFMT_381_381_8_BINARIZED 4
Finger is grabbed 3:4 sub-sampling (every 4 pixels scaled down to 3 pixels), 381 x 381 DPI, 8 bits/
pixel and binarized to 1 bit/pixel.
Supported by TFM, ESS, SONLY and TCD 50.
ABS_PVAL_IFMT_508_254_8 5
Grab the whole finger with 1:2 sub-sampling in Y axis (508 x 254 DPI), 8 bits per pixel.
Supported by ESS and TCD 50.
ABS_PVAL_IFMT_508_508_4 6
Grab the whole finger in full resolution (508 DPI, 8 bits), and cut off to 4 bits per pixel.
Supported by ESS and TCD 50.
ABS_PVAL_IFMT_381_381_4 7
Grab the whole finger with 3:4 sub-sampling (381 x 381 DPI, 8 bits), and cut off to 4 bits per pixel.
Supported by ESS and TCD 50.
ABS_PVAL_IFMT_508_254_4 8
Grab the whole finger with 1:2 sub-sampling in Y axis (508 x 254 DPI, 8 bits), and cut off to 4 bits per
pixel.
Supported by ESS and TCD 50.
