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improved calibration detection to avoid false positives

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This commit is contained in:
Ahmet Inan 2014-11-26 13:57:43 +01:00
parent d6efca8c56
commit 627f1caf17
1 changed files with 15 additions and 6 deletions
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21
app/src/main/rs/decoder.rs
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@ -129,6 +129,7 @@ static int scanline_length, minimum_length, maximum_length;
static int calibration_length, calibration_countdown;
static int leader_timeout, break_timeout, vis_timeout;
static int calibration_progress, leader_counter, leader_length;
static int first_leader_length, second_leader_length;
static int break_length, break_counter, vis_counter, vis_length;
static int buffer_length, bitmap_width, bitmap_height;
static int sync_length, sync_counter, vpos, hpos;
@ -373,9 +374,12 @@ void initialize(float rate, int length, int width, int height)
seperator_counter = 0;
minimum_length = 0.05f * sample_rate;
const float leader_tolerance = 0.3f;
const float first_leader_tolerance = 0.3f;
const float second_leader_tolerance = 0.9f;
const float break_tolerance = 0.7f;
const float timeout_tolerance = 1.1f;
const float leader_timeout_tolerance = 1.1f;
const float break_timeout_tolerance = 1.8f;
const float vis_timeout_tolerance = 1.1f;
const float leader_len = 0.3f;
const float break_len = 0.01f;
const float vis_len = 0.3f;
@ -384,12 +388,14 @@ void initialize(float rate, int length, int width, int height)
leader_counter = 0;
break_counter = 0;
vis_counter = 0;
leader_length = leader_tolerance * leader_len * sample_rate;
first_leader_length = first_leader_tolerance * leader_len * sample_rate;
second_leader_length = second_leader_tolerance * leader_len * sample_rate;
leader_length = first_leader_length;
break_length = break_tolerance * break_len * sample_rate;
vis_length = vis_len * sample_rate;
leader_timeout = timeout_tolerance * leader_len * sample_rate;
break_timeout = timeout_tolerance * break_len * sample_rate;
vis_timeout = timeout_tolerance * vis_len * sample_rate;
leader_timeout = leader_timeout_tolerance * leader_len * sample_rate;
break_timeout = break_timeout_tolerance * break_len * sample_rate;
vis_timeout = vis_timeout_tolerance * vis_len * sample_rate;
const float dat_carrier = 1900.0f;
const float cnt_carrier = 1200.0f;
@ -491,9 +497,11 @@ static int calibration_detected(float dat_value, int cnt_active, int cnt_quantiz
if (calibration_progress == 2) {
calibration_progress = 3;
calibration_countdown = vis_timeout;
leader_length = first_leader_length;
} else {
calibration_progress = 1;
calibration_countdown = break_timeout;
leader_length = second_leader_length;
}
}
@ -506,6 +514,7 @@ static int calibration_detected(float dat_value, int cnt_active, int cnt_quantiz
calibration_countdown = leader_timeout;
} else if (calibration_progress != 3) {
calibration_progress = 0;
leader_length = first_leader_length;
}
}