set_bg_esti_paramsT_set_bg_esti_paramsSetBgEstiParamsSetBgEstiParamsset_bg_esti_params (Operator)


set_bg_esti_paramsT_set_bg_esti_paramsSetBgEstiParamsSetBgEstiParamsset_bg_esti_params — Change the parameters of the data set.


set_bg_esti_params( : : BgEstiHandle, Syspar1, Syspar2, GainMode, Gain1, Gain2, AdaptMode, MinDiff, StatNum, ConfidenceC, TimeC : )

Herror T_set_bg_esti_params(const Htuple BgEstiHandle, const Htuple Syspar1, const Htuple Syspar2, const Htuple GainMode, const Htuple Gain1, const Htuple Gain2, const Htuple AdaptMode, const Htuple MinDiff, const Htuple StatNum, const Htuple ConfidenceC, const Htuple TimeC)

void SetBgEstiParams(const HTuple& BgEstiHandle, const HTuple& Syspar1, const HTuple& Syspar2, const HTuple& GainMode, const HTuple& Gain1, const HTuple& Gain2, const HTuple& AdaptMode, const HTuple& MinDiff, const HTuple& StatNum, const HTuple& ConfidenceC, const HTuple& TimeC)

void HBgEsti::SetBgEstiParams(double Syspar1, double Syspar2, const HString& GainMode, double Gain1, double Gain2, const HString& AdaptMode, double MinDiff, Hlong StatNum, double ConfidenceC, double TimeC) const

void HBgEsti::SetBgEstiParams(double Syspar1, double Syspar2, const char* GainMode, double Gain1, double Gain2, const char* AdaptMode, double MinDiff, Hlong StatNum, double ConfidenceC, double TimeC) const

void HBgEsti::SetBgEstiParams(double Syspar1, double Syspar2, const wchar_t* GainMode, double Gain1, double Gain2, const wchar_t* AdaptMode, double MinDiff, Hlong StatNum, double ConfidenceC, double TimeC) const   (Windows only)

static void HOperatorSet.SetBgEstiParams(HTuple bgEstiHandle, HTuple syspar1, HTuple syspar2, HTuple gainMode, HTuple gain1, HTuple gain2, HTuple adaptMode, HTuple minDiff, HTuple statNum, HTuple confidenceC, HTuple timeC)

void HBgEsti.SetBgEstiParams(double syspar1, double syspar2, string gainMode, double gain1, double gain2, string adaptMode, double minDiff, int statNum, double confidenceC, double timeC)

def set_bg_esti_params(bg_esti_handle: HHandle, syspar_1: float, syspar_2: float, gain_mode: str, gain_1: float, gain_2: float, adapt_mode: str, min_diff: float, stat_num: int, confidence_c: float, time_c: float) -> None


set_bg_esti_paramsset_bg_esti_paramsSetBgEstiParamsSetBgEstiParamsSetBgEstiParamsset_bg_esti_params is used to change the parameters of the data set. The parameters passed by set_bg_esti_paramsset_bg_esti_paramsSetBgEstiParamsSetBgEstiParamsSetBgEstiParamsset_bg_esti_params are the same as in create_bg_esticreate_bg_estiCreateBgEstiCreateBgEstiCreateBgEsticreate_bg_esti (see there for an explanation).

The image format cannot be changed! To do this, a new data set with an initialization image of the appropriate format has to be created.

To exchange the background image completely, use update_bg_estiupdate_bg_estiUpdateBgEstiUpdateBgEstiUpdateBgEstiupdate_bg_esti. The current image then has to be passed for both the input image and the update region.


If GainModeGainModeGainModeGainModegainModegain_mode was set to 'frame'"frame""frame""frame""frame""frame", the run-time can be extremely long for large values of Gain1Gain1Gain1Gain1gain1gain_1 or Gain2Gain2Gain2Gain2gain2gain_2, because the values for the gains' table are determined by a simple binary search.

Execution Information


BgEstiHandleBgEstiHandleBgEstiHandleBgEstiHandlebgEstiHandlebg_esti_handle (input_control)  bg_estimation HBgEsti, HTupleHHandleHTupleHtuple (handle) (IntPtr) (HHandle) (handle)

ID of the BgEsti data set.

Syspar1Syspar1Syspar1Syspar1syspar1syspar_1 (input_control)  real HTuplefloatHTupleHtuple (real) (double) (double) (double)

1. system matrix parameter.

Default value: 0.7

Suggested values: 0.65, 0.7, 0.75

Typical range of values: 0.05 ≤ Syspar1 Syspar1 Syspar1 Syspar1 syspar1 syspar_1 ≤ 1.0

Recommended increment: 0.05

Syspar2Syspar2Syspar2Syspar2syspar2syspar_2 (input_control)  real HTuplefloatHTupleHtuple (real) (double) (double) (double)

2. system matrix parameter.

Default value: 0.7

Suggested values: 0.65, 0.7, 0.75

Typical range of values: 0.05 ≤ Syspar2 Syspar2 Syspar2 Syspar2 syspar2 syspar_2 ≤ 1.0

Recommended increment: 0.05

GainModeGainModeGainModeGainModegainModegain_mode (input_control)  string HTuplestrHTupleHtuple (string) (string) (HString) (char*)

Gain type.

Default value: 'fixed' "fixed" "fixed" "fixed" "fixed" "fixed"

List of values: 'fixed'"fixed""fixed""fixed""fixed""fixed", 'frame'"frame""frame""frame""frame""frame"

Gain1Gain1Gain1Gain1gain1gain_1 (input_control)  real HTuplefloatHTupleHtuple (real) (double) (double) (double)

Kalman gain / foreground adaptation time.

Default value: 0.002

Suggested values: 10.0, 20.0, 50.0, 0.1, 0.05, 0.01, 0.005, 0.001

Restriction: 0.0 <= Gain1

Gain2Gain2Gain2Gain2gain2gain_2 (input_control)  real HTuplefloatHTupleHtuple (real) (double) (double) (double)

Kalman gain / background adaptation time.

Default value: 0.02

Suggested values: 2.0, 4.0, 8.0, 0.5, 0.1, 0.05, 0.01

Restriction: 0.0 <= Gain2

AdaptModeAdaptModeAdaptModeAdaptModeadaptModeadapt_mode (input_control)  string HTuplestrHTupleHtuple (string) (string) (HString) (char*)

Threshold adaptation.

Default value: 'on' "on" "on" "on" "on" "on"

List of values: 'off'"off""off""off""off""off", 'on'"on""on""on""on""on"

MinDiffMinDiffMinDiffMinDiffminDiffmin_diff (input_control)  real HTuplefloatHTupleHtuple (real) (double) (double) (double)

Foreground/background threshold.

Default value: 7.0

Suggested values: 3.0, 5.0, 7.0, 9.0, 11.0

Recommended increment: 0.2

StatNumStatNumStatNumStatNumstatNumstat_num (input_control)  integer HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Number of statistic data sets.

Default value: 10

Suggested values: 5, 10, 20, 30

Typical range of values: 1 ≤ StatNum StatNum StatNum StatNum statNum stat_num

Recommended increment: 5

ConfidenceCConfidenceCConfidenceCConfidenceCconfidenceCconfidence_c (input_control)  real HTuplefloatHTupleHtuple (real) (double) (double) (double)

Confidence constant.

Default value: 3.25

Suggested values: 4.30, 3.25, 2.82, 2.62

Recommended increment: 0.01

Restriction: 0.0 < ConfidenceC

TimeCTimeCTimeCTimeCtimeCtime_c (input_control)  real HTuplefloatHTupleHtuple (real) (double) (double) (double)

Constant for decay time.

Default value: 15.0

Suggested values: 10.0, 15.0, 20.0

Recommended increment: 5.0

Restriction: 0.0 < TimeC

Example (HDevelop)

* Read image for initialization:
* Initialize BgEsti dataset with
* fixed gains and threshold adaption:
create_bg_esti(InitImage,0.7,0.7,'fixed',0.002,0.02, \
* Read the next image in sequence:
* Estimate the background:
* Display the foreground region:
dev_display (ForegroundRegion1)
* Read the next image in sequence:
* Estimate the background:
* Display the foreground region:
dev_display (ForegroundRegion2)
* etc.
* Change parameter in dataset:
set_bg_esti_params(BgEstiHandle,0.7,0.7,'fixed', \
* Read the next image in sequence:
* Estimate the background:
* Display the foreground region:
* etc.


set_bg_esti_paramsset_bg_esti_paramsSetBgEstiParamsSetBgEstiParamsSetBgEstiParamsset_bg_esti_params returns TRUE if all parameters are correct.

Possible Predecessors


Possible Successors


See also