set_bg_esti_paramsT_set_bg_esti_paramsSetBgEstiParamsSetBgEstiParams (Operator)


set_bg_esti_paramsT_set_bg_esti_paramsSetBgEstiParamsSetBgEstiParams — 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)


set_bg_esti_paramsset_bg_esti_paramsSetBgEstiParamsSetBgEstiParamsSetBgEstiParams is used to change the parameters of the data set. The parameters passed by set_bg_esti_paramsset_bg_esti_paramsSetBgEstiParamsSetBgEstiParamsSetBgEstiParams are the same as in create_bg_esticreate_bg_estiCreateBgEstiCreateBgEstiCreateBgEsti (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_estiUpdateBgEstiUpdateBgEstiUpdateBgEsti. The current image then has to be passed for both the input image and the update region.


If GainModeGainModeGainModeGainModegainMode was set to 'frame'"frame""frame""frame""frame", the run-time can be extremely long for large values of Gain1Gain1Gain1Gain1gain1 or Gain2Gain2Gain2Gain2gain2, because the values for the gains' table are determined by a simple binary search.

Execution Information


BgEstiHandleBgEstiHandleBgEstiHandleBgEstiHandlebgEstiHandle (input_control)  bg_estimation HBgEsti, HTupleHTupleHtuple (handle) (IntPtr) (HHandle) (handle)

ID of the BgEsti data set.

Syspar1Syspar1Syspar1Syspar1syspar1 (input_control)  real HTupleHTupleHtuple (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 ≤ 1.0

Recommended increment: 0.05

Syspar2Syspar2Syspar2Syspar2syspar2 (input_control)  real HTupleHTupleHtuple (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 ≤ 1.0

Recommended increment: 0.05

GainModeGainModeGainModeGainModegainMode (input_control)  string HTupleHTupleHtuple (string) (string) (HString) (char*)

Gain type.

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

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

Gain1Gain1Gain1Gain1gain1 (input_control)  real HTupleHTupleHtuple (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

Gain2Gain2Gain2Gain2gain2 (input_control)  real HTupleHTupleHtuple (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

AdaptModeAdaptModeAdaptModeAdaptModeadaptMode (input_control)  string HTupleHTupleHtuple (string) (string) (HString) (char*)

Threshold adaptation.

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

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

MinDiffMinDiffMinDiffMinDiffminDiff (input_control)  real HTupleHTupleHtuple (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

StatNumStatNumStatNumStatNumstatNum (input_control)  integer HTupleHTupleHtuple (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

Recommended increment: 5

ConfidenceCConfidenceCConfidenceCConfidenceCconfidenceC (input_control)  real HTupleHTupleHtuple (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

TimeCTimeCTimeCTimeCtimeC (input_control)  real HTupleHTupleHtuple (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_paramsSetBgEstiParamsSetBgEstiParamsSetBgEstiParams returns 2 (H_MSG_TRUE) if all parameters are correct.

Possible Predecessors


Possible Successors


See also