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aes4000: image quality improvements

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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
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18
libfprint/drivers/aes4000.c
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@ -102,17 +102,17 @@ static const struct aes4000_regwrite {
{ 0x85, 0x3d }, /* set calibration capacitance */
{ 0x86, 0x03 }, /* detect drive voltage */
{ 0x87, 0x01 }, /* set detection frequency to 125khz */
{ 0x88, 0x03 }, /* set column scan period */
{ 0x89, 0x03 }, /* set measure drive */
{ 0x8a, 0x32 }, /* set measure frequency and sense amplifier bias */
{ 0x88, 0x02 }, /* set column scan period */
{ 0x89, 0x02 }, /* set measure drive */
{ 0x8a, 0x33 }, /* set measure frequency and sense amplifier bias */
{ 0x8b, 0x33 }, /* set matrix pattern */
{ 0x8c, 0x0b }, /* set demodulation phase 1 */
{ 0x8c, 0x0f }, /* set demodulation phase 1 */
{ 0x8d, 0x04 }, /* set demodulation phase 2 */
{ 0x8e, 0x33 }, /* set sensor gain */
{ 0x8f, 0x03 }, /* set image parameters */
{ 0x90, 0x0f }, /* carrier offset null */
{ 0x91, 0x03 }, /* set A/D reference high */
{ 0x92, 0x03 }, /* set A/D reference low */
{ 0x8e, 0x23 }, /* set sensor gain */
{ 0x8f, 0x07 }, /* set image parameters */
{ 0x90, 0x00 }, /* carrier offset null */
{ 0x91, 0x1c }, /* set A/D reference high */
{ 0x92, 0x08 }, /* set A/D reference low */
{ 0x93, 0x00 }, /* set start row to 0 */
{ 0x94, 0x05 }, /* set end row to 5 */
{ 0x95, 0x00 }, /* set start column to 0 */