depau/libfprint
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

aes4000: image quality improvements

Browse source 
The windows driver takes one sample at the previous register settings
and then changes some registers before resamping (and getting much better
images). The exact changes that it makes seem to vary, perhaps based on
the histogram.

Anyway, this is an approximation of the settings used for the 2nd sample
which should help matching results.
This commit is contained in:
Daniel Drake 2007-11-09 13:47:32 +00:00
parent b9238e8b8a
commit a73cbc10fb
1 changed files with 9 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
libfprint/drivers/aes4000.c
View file

@ -102,17 +102,17 @@ static const struct aes4000_regwrite {
{ 0x85, 0x3d }, /* set calibration capacitance */ { 0x85, 0x3d }, /* set calibration capacitance */
{ 0x86, 0x03 }, /* detect drive voltage */ { 0x86, 0x03 }, /* detect drive voltage */
{ 0x87, 0x01 }, /* set detection frequency to 125khz */ { 0x87, 0x01 }, /* set detection frequency to 125khz */
{ 0x88, 0x03 }, /* set column scan period */ { 0x88, 0x02 }, /* set column scan period */
{ 0x89, 0x03 }, /* set measure drive */ { 0x89, 0x02 }, /* set measure drive */
{ 0x8a, 0x32 }, /* set measure frequency and sense amplifier bias */ { 0x8a, 0x33 }, /* set measure frequency and sense amplifier bias */
{ 0x8b, 0x33 }, /* set matrix pattern */ { 0x8b, 0x33 }, /* set matrix pattern */
{ 0x8c, 0x0b }, /* set demodulation phase 1 */ { 0x8c, 0x0f }, /* set demodulation phase 1 */
{ 0x8d, 0x04 }, /* set demodulation phase 2 */ { 0x8d, 0x04 }, /* set demodulation phase 2 */
{ 0x8e, 0x33 }, /* set sensor gain */ { 0x8e, 0x23 }, /* set sensor gain */
{ 0x8f, 0x03 }, /* set image parameters */ { 0x8f, 0x07 }, /* set image parameters */
{ 0x90, 0x0f }, /* carrier offset null */ { 0x90, 0x00 }, /* carrier offset null */
{ 0x91, 0x03 }, /* set A/D reference high */ { 0x91, 0x1c }, /* set A/D reference high */
{ 0x92, 0x03 }, /* set A/D reference low */ { 0x92, 0x08 }, /* set A/D reference low */
{ 0x93, 0x00 }, /* set start row to 0 */ { 0x93, 0x00 }, /* set start row to 0 */
{ 0x94, 0x05 }, /* set end row to 5 */ { 0x94, 0x05 }, /* set end row to 5 */
{ 0x95, 0x00 }, /* set start column to 0 */ { 0x95, 0x00 }, /* set start column to 0 */