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Only complete scan with MIN_ROWS in print

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Don't consider the scan complete unless theres at least
MIN_ROWS recorded or very long blank read occurred.

Typical problem spot: one brief touch before starting the
actual scan. Happens most commonly if scan is started from
before the first joint resulting in a gap after the inital touch.

http://lists.reactivated.net/pipermail/fprint/2009-December/001406.html
This commit is contained in:
Alexia Death 2009-12-26 17:02:03 +02:00 committed by Bastien Nocera
parent c575afba9a
commit 25161286f5
1 changed files with 12 additions and 2 deletions
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14
libfprint/drivers/upeksonly.c
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@ -31,6 +31,7 @@
#define IMG_WIDTH 288
#define NUM_BULK_TRANSFERS 24
#define MAX_ROWS 700
#define MIN_ROWS 64
struct img_transfer_data {
int idx;
@ -218,13 +219,22 @@ static void row_complete(struct fp_img_dev *dev)
int total;
compute_rows(lastrow, sdev->rowbuf, &diff, &total);
if (total < 52000) {
sdev->num_blank = 0;
} else {
sdev->num_blank++;
if (sdev->num_blank > 500) {
/* Don't consider the scan complete unless theres at least
* MIN_ROWS recorded or very long blank read occurred.
*
* Typical problem spot: one brief touch before starting the
* actual scan. Happens most commonly if scan is started
* from before the first joint resulting in a gap after the inital touch.
*/
if ((sdev->num_blank > 500)
&& ((sdev->num_rows > MIN_ROWS) || (sdev->num_blank > 5000))) {
sdev->finger_removed = 1;
fp_dbg("detected finger removal");
fp_dbg("detected finger removal. Blank rows: %d, Full rows: %d", sdev->num_blank, sdev->num_rows);
handoff_img(dev);
return;
}