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aeslib: improve frame-assembling routines

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Some scanners provide hardware assistance in frame assemling, i.e.
horizontal and vertical offset to previous frame is provided. This
commit improves code to utilise that assistance. Sensors without
hardware assistance will use software algorithm, which was also
improved to do search in horizontal direction.
This commit is contained in:
Vasily Khoruzhick
2013-12-30 12:07:53 +03:00
parent 82ae7c1c09
commit 061a457658
10 changed files with 320 additions and 129 deletions
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21
libfprint/drivers/aes1610.c
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@@ -609,13 +609,24 @@ static void capture_read_strip_cb(struct libusb_transfer *transfer)
/* stop capturing if MAX_FRAMES is reached */
if (aesdev->blanks_count > 10 || g_slist_length(aesdev->strips) >= MAX_FRAMES) {
struct fp_img *img;
unsigned int height, rev_height;
fp_dbg("sending stop capture.... blanks=%d frames=%d", aesdev->blanks_count, g_slist_length(aesdev->strips));
/* send stop capture bits */
aes_write_regv(dev, capture_stop, G_N_ELEMENTS(capture_stop), stub_capture_stop_cb, NULL);
aesdev->strips = g_slist_reverse(aesdev->strips);
height = aes_calc_delta(aesdev->strips, aesdev->strips_len,
FRAME_WIDTH, FRAME_HEIGHT, FALSE);
rev_height = aes_calc_delta(aesdev->strips, aesdev->strips_len,
FRAME_WIDTH, FRAME_HEIGHT, TRUE);
fp_dbg("heights: %d rev: %d", height, rev_height);
if (rev_height < height) {
fp_dbg("Reversed direction");
height = aes_calc_delta(aesdev->strips, aesdev->strips_len,
FRAME_WIDTH, FRAME_HEIGHT, FALSE);
}
img = aes_assemble(aesdev->strips, aesdev->strips_len,
FRAME_WIDTH, FRAME_HEIGHT);
FRAME_WIDTH, FRAME_HEIGHT, FRAME_WIDTH + FRAME_WIDTH / 2);
g_slist_free_full(aesdev->strips, g_free);
aesdev->strips = NULL;
aesdev->strips_len = 0;
@@ -829,13 +840,9 @@ struct fp_img_driver aes1610_driver = {
},
.flags = 0,
.img_height = -1,
.img_width = 128,
.img_width = FRAME_WIDTH + FRAME_WIDTH / 2,
/* temporarily lowered until we sort out image processing code
* binarized scan quality is good, minutiae detection is accurate,
* it's just that we get fewer minutiae than other scanners (less scanning
* area) */
.bz3_threshold = 10,
.bz3_threshold = 50,
.open = dev_init,
.close = dev_deinit,