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Merge moved code from opencv/3.4

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pull/2394/head 4.2.0
Alexander Alekhin 5 years ago
parent f9bbe706d2 12ffd7f0cf
commit 65abc7090d
3 changed files with 493 additions and 479 deletions
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  1. 121
      modules/cudabgsegm/src/cuda/mog2.cu
  2. 37
      modules/cudabgsegm/src/cuda/mog2.hpp
  3. 122
      modules/cudabgsegm/src/mog2.cpp

121
modules/cudabgsegm/src/cuda/mog2.cu
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@ -47,7 +47,13 @@
#include "opencv2/core/cuda/vec_math.hpp"
#include "opencv2/core/cuda/limits.hpp"
namespace cv { namespace cuda { namespace device
#include "mog2.hpp"
namespace cv
{
namespace cuda
{
namespace device
{
namespace mog2
{
@ -104,43 +110,16 @@ namespace cv { namespace cuda { namespace device
///////////////////////////////////////////////////////////////
// MOG2
__constant__ int c_nmixtures;
__constant__ float c_Tb;
__constant__ float c_TB;
__constant__ float c_Tg;
__constant__ float c_varInit;
__constant__ float c_varMin;
__constant__ float c_varMax;
__constant__ float c_tau;
__constant__ unsigned char c_shadowVal;
void loadConstants(int nmixtures, float Tb, float TB, float Tg, float varInit, float varMin, float varMax, float tau, unsigned char shadowVal)
{
varMin = ::fminf(varMin, varMax);
varMax = ::fmaxf(varMin, varMax);
cudaSafeCall( cudaMemcpyToSymbol(c_nmixtures, &nmixtures, sizeof(int)) );
cudaSafeCall( cudaMemcpyToSymbol(c_Tb, &Tb, sizeof(float)) );
cudaSafeCall( cudaMemcpyToSymbol(c_TB, &TB, sizeof(float)) );
cudaSafeCall( cudaMemcpyToSymbol(c_Tg, &Tg, sizeof(float)) );
cudaSafeCall( cudaMemcpyToSymbol(c_varInit, &varInit, sizeof(float)) );
cudaSafeCall( cudaMemcpyToSymbol(c_varMin, &varMin, sizeof(float)) );
cudaSafeCall( cudaMemcpyToSymbol(c_varMax, &varMax, sizeof(float)) );
cudaSafeCall( cudaMemcpyToSymbol(c_tau, &tau, sizeof(float)) );
cudaSafeCall( cudaMemcpyToSymbol(c_shadowVal, &shadowVal, sizeof(unsigned char)) );
}
template <bool detectShadows, typename SrcT, typename WorkT>
__global__ void mog2(const PtrStepSz<SrcT> frame, PtrStepb fgmask, PtrStepb modesUsed,
PtrStepf gmm_weight, PtrStepf gmm_variance, PtrStep<WorkT> gmm_mean,
const float alphaT, const float alpha1, const float prune)
const float alphaT, const float alpha1, const float prune, const Constants *const constants)
{
const int x = blockIdx.x * blockDim.x + threadIdx.x;
const int y = blockIdx.y * blockDim.y + threadIdx.y;
if (x >= frame.cols || y >= frame.rows)
return;
if (x < frame.cols && y < frame.rows)
{
WorkT pix = cvt(frame(y, x));
//calculate distances to the modes (+ sort)
@ -153,7 +132,7 @@ namespace cv { namespace cuda { namespace device
bool fitsPDF = false; //if it remains zero a new GMM mode will be added
int nmodes = modesUsed(y, x);
int nNewModes = nmodes; //current number of modes in GMM
const int nNewModes = nmodes; //current number of modes in GMM
float totalWeight = 0.0f;
@ -168,20 +147,20 @@ namespace cv { namespace cuda { namespace device
if (!fitsPDF)
{
//check if it belongs to some of the remaining modes
float var = gmm_variance(mode * frame.rows + y, x);
const float var = gmm_variance(mode * frame.rows + y, x);
WorkT mean = gmm_mean(mode * frame.rows + y, x);
const WorkT mean = gmm_mean(mode * frame.rows + y, x);
//calculate difference and distance
WorkT diff = mean - pix;
float dist2 = sqr(diff);
const WorkT diff = mean - pix;
const float dist2 = sqr(diff);
//background? - Tb - usually larger than Tg
if (totalWeight < c_TB && dist2 < c_Tb * var)
if (totalWeight < constants->TB_ && dist2 < constants->Tb_ * var)
background = true;
//check fit
if (dist2 < c_Tg * var)
if (dist2 < constants->Tg_ * var)
{
//belongs to the mode
fitsPDF = true;
@ -199,8 +178,8 @@ namespace cv { namespace cuda { namespace device
float varnew = var + k * (dist2 - var);
//limit the variance
varnew = ::fmaxf(varnew, c_varMin);
varnew = ::fminf(varnew, c_varMax);
varnew = ::fmaxf(varnew, constants->varMin_);
varnew = ::fminf(varnew, constants->varMax_);
gmm_variance(mode * frame.rows + y, x) = varnew;
@ -249,7 +228,7 @@ namespace cv { namespace cuda { namespace device
if (!fitsPDF)
{
// replace the weakest or add a new one
int mode = nmodes == c_nmixtures ? c_nmixtures - 1 : nmodes++;
const int mode = nmodes == constants->nmixtures_ ? constants->nmixtures_ - 1 : nmodes++;
if (nmodes == 1)
gmm_weight(mode * frame.rows + y, x) = 1.f;
@ -266,7 +245,7 @@ namespace cv { namespace cuda { namespace device
// init
gmm_mean(mode * frame.rows + y, x) = pix;
gmm_variance(mode * frame.rows + y, x) = c_varInit;
gmm_variance(mode * frame.rows + y, x) = constants->varInit_;
//sort
//find the new place for it
@ -295,25 +274,25 @@ namespace cv { namespace cuda { namespace device
// check all the components marked as background:
for (int mode = 0; mode < nmodes; ++mode)
{
WorkT mean = gmm_mean(mode * frame.rows + y, x);
const WorkT mean = gmm_mean(mode * frame.rows + y, x);
WorkT pix_mean = pix * mean;
const WorkT pix_mean = pix * mean;
float numerator = sum(pix_mean);
float denominator = sqr(mean);
const float numerator = sum(pix_mean);
const float denominator = sqr(mean);
// no division by zero allowed
if (denominator == 0)
break;
// if tau < a < 1 then also check the color distortion
if (numerator <= denominator && numerator >= c_tau * denominator)
else if (numerator <= denominator && numerator >= constants->tau_ * denominator)
{
float a = numerator / denominator;
const float a = numerator / denominator;
WorkT dD = a * mean - pix;
if (sqr(dD) < c_Tb * gmm_variance(mode * frame.rows + y, x) * a * a)
if (sqr(dD) < constants->Tb_ * gmm_variance(mode * frame.rows + y, x) * a * a)
{
isShadow = true;
break;
@ -321,17 +300,18 @@ namespace cv { namespace cuda { namespace device
};
tWeight += gmm_weight(mode * frame.rows + y, x);
if (tWeight > c_TB)
if (tWeight > constants->TB_)
break;
}
}
fgmask(y, x) = background ? 0 : isShadow ? c_shadowVal : 255;
fgmask(y, x) = background ? 0 : isShadow ? constants->shadowVal_ : 255;
}
}
template <typename SrcT, typename WorkT>
void mog2_caller(PtrStepSzb frame, PtrStepSzb fgmask, PtrStepSzb modesUsed, PtrStepSzf weight, PtrStepSzf variance, PtrStepSzb mean,
float alphaT, float prune, bool detectShadows, cudaStream_t stream)
float alphaT, float prune, bool detectShadows, const Constants *const constants, cudaStream_t stream)
{
dim3 block(32, 8);
dim3 grid(divUp(frame.cols, block.x), divUp(frame.rows, block.y));
@ -344,7 +324,7 @@ namespace cv { namespace cuda { namespace device
mog2<true, SrcT, WorkT><<<grid, block, 0, stream>>>((PtrStepSz<SrcT>)frame, fgmask, modesUsed,
weight, variance, (PtrStepSz<WorkT>)mean,
alphaT, alpha1, prune);
alphaT, alpha1, prune, constants);
}
else
{
@ -352,7 +332,7 @@ namespace cv { namespace cuda { namespace device
mog2<false, SrcT, WorkT><<<grid, block, 0, stream>>>((PtrStepSz<SrcT>)frame, fgmask, modesUsed,
weight, variance, (PtrStepSz<WorkT>)mean,
alphaT, alpha1, prune);
alphaT, alpha1, prune, constants);
}
cudaSafeCall(cudaGetLastError());
@ -362,20 +342,19 @@ namespace cv { namespace cuda { namespace device
}
void mog2_gpu(PtrStepSzb frame, int cn, PtrStepSzb fgmask, PtrStepSzb modesUsed, PtrStepSzf weight, PtrStepSzf variance, PtrStepSzb mean,
float alphaT, float prune, bool detectShadows, cudaStream_t stream)
float alphaT, float prune, bool detectShadows, const Constants *const constants, cudaStream_t stream)
{
typedef void (*func_t)(PtrStepSzb frame, PtrStepSzb fgmask, PtrStepSzb modesUsed, PtrStepSzf weight, PtrStepSzf variance, PtrStepSzb mean, float alphaT, float prune, bool detectShadows, cudaStream_t stream);
typedef void (*func_t)(PtrStepSzb frame, PtrStepSzb fgmask, PtrStepSzb modesUsed, PtrStepSzf weight, PtrStepSzf variance, PtrStepSzb mean, float alphaT, float prune, bool detectShadows, const Constants *const constants, cudaStream_t stream);
static const func_t funcs[] =
{
0, mog2_caller<uchar, float>, 0, mog2_caller<uchar3, float3>, mog2_caller<uchar4, float4>
};
0, mog2_caller<uchar, float>, 0, mog2_caller<uchar3, float3>, mog2_caller<uchar4, float4>};
funcs[cn](frame, fgmask, modesUsed, weight, variance, mean, alphaT, prune, detectShadows, stream);
funcs[cn](frame, fgmask, modesUsed, weight, variance, mean, alphaT, prune, detectShadows, constants, stream);
}
template <typename WorkT, typename OutT>
__global__ void getBackgroundImage2(const PtrStepSzb modesUsed, const PtrStepf gmm_weight, const PtrStep<WorkT> gmm_mean, PtrStep<OutT> dst)
__global__ void getBackgroundImage2(const PtrStepSzb modesUsed, const PtrStepf gmm_weight, const PtrStep<WorkT> gmm_mean, PtrStep<OutT> dst, const Constants *const constants)
{
const int x = blockIdx.x * blockDim.x + threadIdx.x;
const int y = blockIdx.y * blockDim.y + threadIdx.y;
@ -397,7 +376,7 @@ namespace cv { namespace cuda { namespace device
totalWeight += weight;
if(totalWeight > c_TB)
if (totalWeight > constants->TB_)
break;
}
@ -407,33 +386,33 @@ namespace cv { namespace cuda { namespace device
}
template <typename WorkT, typename OutT>
void getBackgroundImage2_caller(PtrStepSzb modesUsed, PtrStepSzf weight, PtrStepSzb mean, PtrStepSzb dst, cudaStream_t stream)
void getBackgroundImage2_caller(PtrStepSzb modesUsed, PtrStepSzf weight, PtrStepSzb mean, PtrStepSzb dst, const Constants *const constants, cudaStream_t stream)
{
dim3 block(32, 8);
dim3 grid(divUp(modesUsed.cols, block.x), divUp(modesUsed.rows, block.y));
cudaSafeCall(cudaFuncSetCacheConfig(getBackgroundImage2<WorkT, OutT>, cudaFuncCachePreferL1));
getBackgroundImage2<WorkT, OutT><<<grid, block, 0, stream>>>(modesUsed, weight, (PtrStepSz<WorkT>) mean, (PtrStepSz<OutT>) dst);
getBackgroundImage2<WorkT, OutT><<<grid, block, 0, stream>>>(modesUsed, weight, (PtrStepSz<WorkT>)mean, (PtrStepSz<OutT>)dst, constants);
cudaSafeCall(cudaGetLastError());
if (stream == 0)
cudaSafeCall(cudaDeviceSynchronize());
}
void getBackgroundImage2_gpu(int cn, PtrStepSzb modesUsed, PtrStepSzf weight, PtrStepSzb mean, PtrStepSzb dst, cudaStream_t stream)
void getBackgroundImage2_gpu(int cn, PtrStepSzb modesUsed, PtrStepSzf weight, PtrStepSzb mean, PtrStepSzb dst, const Constants *const constants, cudaStream_t stream)
{
typedef void (*func_t)(PtrStepSzb modesUsed, PtrStepSzf weight, PtrStepSzb mean, PtrStepSzb dst, cudaStream_t stream);
typedef void (*func_t)(PtrStepSzb modesUsed, PtrStepSzf weight, PtrStepSzb mean, PtrStepSzb dst, const Constants *const constants, cudaStream_t stream);
static const func_t funcs[] =
{
0, getBackgroundImage2_caller<float, uchar>, 0, getBackgroundImage2_caller<float3, uchar3>, getBackgroundImage2_caller<float4, uchar4>
};
0, getBackgroundImage2_caller<float, uchar>, 0, getBackgroundImage2_caller<float3, uchar3>, getBackgroundImage2_caller<float4, uchar4>};
funcs[cn](modesUsed, weight, mean, dst, stream);
}
funcs[cn](modesUsed, weight, mean, dst, constants, stream);
}
}}}
} // namespace mog2
} // namespace device
} // namespace cuda
} // namespace cv
#endif /* CUDA_DISABLER */

37
modules/cudabgsegm/src/cuda/mog2.hpp
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@ -0,0 +1,37 @@
// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
#ifndef OPENCV_CUDA_MOG2_H
#define OPENCV_CUDA_MOG2_H
#include "opencv2/core/cuda.hpp"
struct CUstream_st;
typedef struct CUstream_st *cudaStream_t;
namespace cv { namespace cuda {
class Stream;
namespace device { namespace mog2 {
typedef struct
{
float Tb_;
float TB_;
float Tg_;
float varInit_;
float varMin_;
float varMax_;
float tau_;
int nmixtures_;
unsigned char shadowVal_;
} Constants;
void mog2_gpu(PtrStepSzb frame, int cn, PtrStepSzb fgmask, PtrStepSzb modesUsed, PtrStepSzf weight, PtrStepSzf variance, PtrStepSzb mean, float alphaT, float prune, bool detectShadows, const Constants *const constants, cudaStream_t stream);
void getBackgroundImage2_gpu(int cn, PtrStepSzb modesUsed, PtrStepSzf weight, PtrStepSzb mean, PtrStepSzb dst, const Constants *const constants, cudaStream_t stream);
} } } }
#endif /* OPENCV_CUDA_MOG2_H */

122
modules/cudabgsegm/src/mog2.cpp
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@ -41,25 +41,21 @@
//M*/
#include "precomp.hpp"
#include "cuda/mog2.hpp"
using namespace cv;
using namespace cv::cuda;
using namespace cv::cuda::device::mog2;
#if !defined HAVE_CUDA || defined(CUDA_DISABLER)
Ptr<cuda::BackgroundSubtractorMOG2> cv::cuda::createBackgroundSubtractorMOG2(int, double, bool) { throw_no_cuda(); return Ptr<cuda::BackgroundSubtractorMOG2>(); }
#else
namespace cv { namespace cuda { namespace device
{
namespace mog2
Ptr<cuda::BackgroundSubtractorMOG2> cv::cuda::createBackgroundSubtractorMOG2(int, double, bool)
{
void loadConstants(int nmixtures, float Tb, float TB, float Tg, float varInit, float varMin, float varMax, float tau, unsigned char shadowVal);
void mog2_gpu(PtrStepSzb frame, int cn, PtrStepSzb fgmask, PtrStepSzb modesUsed, PtrStepSzf weight, PtrStepSzf variance, PtrStepSzb mean, float alphaT, float prune, bool detectShadows, cudaStream_t stream);
void getBackgroundImage2_gpu(int cn, PtrStepSzb modesUsed, PtrStepSzf weight, PtrStepSzb mean, PtrStepSzb dst, cudaStream_t stream);
throw_no_cuda();
return Ptr<cuda::BackgroundSubtractorMOG2>();
}
}}}
#else
namespace
{
@ -82,6 +78,7 @@ namespace
{
public:
MOG2Impl(int history, double varThreshold, bool detectShadows);
~MOG2Impl();
void apply(InputArray image, OutputArray fgmask, double learningRate = -1) CV_OVERRIDE;
void apply(InputArray image, OutputArray fgmask, double learningRate, Stream &stream) CV_OVERRIDE;
@ -92,26 +89,26 @@ namespace
int getHistory() const CV_OVERRIDE { return history_; }
void setHistory(int history) CV_OVERRIDE { history_ = history; }
int getNMixtures() const CV_OVERRIDE { return nmixtures_; }
void setNMixtures(int nmixtures) CV_OVERRIDE { nmixtures_ = nmixtures; }
int getNMixtures() const CV_OVERRIDE { return constantsHost_.nmixtures_; }
void setNMixtures(int nmixtures) CV_OVERRIDE { constantsHost_.nmixtures_ = nmixtures; }
double getBackgroundRatio() const CV_OVERRIDE { return backgroundRatio_; }
void setBackgroundRatio(double ratio) CV_OVERRIDE { backgroundRatio_ = (float) ratio; }
double getBackgroundRatio() const CV_OVERRIDE { return constantsHost_.TB_; }
void setBackgroundRatio(double ratio) CV_OVERRIDE { constantsHost_.TB_ = (float)ratio; }
double getVarThreshold() const CV_OVERRIDE { return varThreshold_; }
void setVarThreshold(double varThreshold) CV_OVERRIDE { varThreshold_ = (float) varThreshold; }
double getVarThreshold() const CV_OVERRIDE { return constantsHost_.Tb_; }
void setVarThreshold(double varThreshold) CV_OVERRIDE { constantsHost_.Tb_ = (float)varThreshold; }
double getVarThresholdGen() const CV_OVERRIDE { return varThresholdGen_; }
void setVarThresholdGen(double varThresholdGen) CV_OVERRIDE { varThresholdGen_ = (float) varThresholdGen; }
double getVarThresholdGen() const CV_OVERRIDE { return constantsHost_.Tg_; }
void setVarThresholdGen(double varThresholdGen) CV_OVERRIDE { constantsHost_.Tg_ = (float)varThresholdGen; }
double getVarInit() const CV_OVERRIDE { return varInit_; }
void setVarInit(double varInit) CV_OVERRIDE { varInit_ = (float) varInit; }
double getVarInit() const CV_OVERRIDE { return constantsHost_.varInit_; }
void setVarInit(double varInit) CV_OVERRIDE { constantsHost_.varInit_ = (float)varInit; }
double getVarMin() const CV_OVERRIDE { return varMin_; }
void setVarMin(double varMin) CV_OVERRIDE { varMin_ = (float) varMin; }
double getVarMin() const CV_OVERRIDE { return constantsHost_.varMin_; }
void setVarMin(double varMin) CV_OVERRIDE { constantsHost_.varMin_ = ::fminf((float)varMin, constantsHost_.varMax_); }
double getVarMax() const CV_OVERRIDE { return varMax_; }
void setVarMax(double varMax) CV_OVERRIDE { varMax_ = (float) varMax; }
double getVarMax() const CV_OVERRIDE { return constantsHost_.varMax_; }
void setVarMax(double varMax) CV_OVERRIDE { constantsHost_.varMax_ = ::fmaxf(constantsHost_.varMin_, (float)varMax); }
double getComplexityReductionThreshold() const CV_OVERRIDE { return ct_; }
void setComplexityReductionThreshold(double ct) CV_OVERRIDE { ct_ = (float)ct; }
@ -119,27 +116,21 @@ namespace
bool getDetectShadows() const CV_OVERRIDE { return detectShadows_; }
void setDetectShadows(bool detectShadows) CV_OVERRIDE { detectShadows_ = detectShadows; }
int getShadowValue() const CV_OVERRIDE { return shadowValue_; }
void setShadowValue(int value) CV_OVERRIDE { shadowValue_ = (uchar) value; }
int getShadowValue() const CV_OVERRIDE { return constantsHost_.shadowVal_; }
void setShadowValue(int value) CV_OVERRIDE { constantsHost_.shadowVal_ = (uchar)value; }
double getShadowThreshold() const CV_OVERRIDE { return shadowThreshold_; }
void setShadowThreshold(double threshold) CV_OVERRIDE { shadowThreshold_ = (float) threshold; }
double getShadowThreshold() const CV_OVERRIDE { return constantsHost_.tau_; }
void setShadowThreshold(double threshold) CV_OVERRIDE { constantsHost_.tau_ = (float)threshold; }
private:
void initialize(Size frameSize, int frameType);
void initialize(Size frameSize, int frameType, Stream &stream);
Constants constantsHost_;
Constants *constantsDevice_;
int history_;
int nmixtures_;
float backgroundRatio_;
float varThreshold_;
float varThresholdGen_;
float varInit_;
float varMin_;
float varMax_;
float ct_;
bool detectShadows_;
uchar shadowValue_;
float shadowThreshold_;
Size frameSize_;
int frameType_;
@ -153,22 +144,29 @@ namespace
GpuMat bgmodelUsedModes_;
};
MOG2Impl::MOG2Impl(int history, double varThreshold, bool detectShadows) :
frameSize_(0, 0), frameType_(0), nframes_(0)
MOG2Impl::MOG2Impl(int history, double varThreshold, bool detectShadows) : frameSize_(0, 0), frameType_(0), nframes_(0)
{
history_ = history > 0 ? history : defaultHistory;
varThreshold_ = varThreshold > 0 ? (float) varThreshold : defaultVarThreshold;
detectShadows_ = detectShadows;
nmixtures_ = defaultNMixtures;
backgroundRatio_ = defaultBackgroundRatio;
varInit_ = defaultVarInit;
varMax_ = defaultVarMax;
varMin_ = defaultVarMin;
varThresholdGen_ = defaultVarThresholdGen;
ct_ = defaultCT;
shadowValue_ = defaultShadowValue;
shadowThreshold_ = defaultShadowThreshold;
setNMixtures(defaultNMixtures);
setBackgroundRatio(defaultBackgroundRatio);
setVarInit(defaultVarInit);
setVarMin(defaultVarMin);
setVarMax(defaultVarMax);
setVarThreshold(varThreshold > 0 ? (float)varThreshold : defaultVarThreshold);
setVarThresholdGen(defaultVarThresholdGen);
setShadowValue(defaultShadowValue);
setShadowThreshold(defaultShadowThreshold);
cudaSafeCall(cudaMalloc((void **)&constantsDevice_, sizeof(Constants)));
}
MOG2Impl::~MOG2Impl()
{
cudaFree(constantsDevice_);
}
void MOG2Impl::apply(InputArray image, OutputArray fgmask, double learningRate)
@ -186,7 +184,7 @@ namespace
int work_ch = ch;
if (nframes_ == 0 || learningRate >= 1.0 || frame.size() != frameSize_ || work_ch != mean_.channels())
initialize(frame.size(), frame.type());
initialize(frame.size(), frame.type(), stream);
_fgmask.create(frameSize_, CV_8UC1);
GpuMat fgmask = _fgmask.getGpuMat();
@ -198,7 +196,7 @@ namespace
CV_Assert(learningRate >= 0);
mog2_gpu(frame, frame.channels(), fgmask, bgmodelUsedModes_, weight_, variance_, mean_,
(float) learningRate, static_cast<float>(-learningRate * ct_), detectShadows_, StreamAccessor::getStream(stream));
(float)learningRate, static_cast<float>(-learningRate * ct_), detectShadows_, constantsDevice_, StreamAccessor::getStream(stream));
}
void MOG2Impl::getBackgroundImage(OutputArray backgroundImage) const
@ -213,10 +211,10 @@ namespace
_backgroundImage.create(frameSize_, frameType_);
GpuMat backgroundImage = _backgroundImage.getGpuMat();
getBackgroundImage2_gpu(backgroundImage.channels(), bgmodelUsedModes_, weight_, mean_, backgroundImage, StreamAccessor::getStream(stream));
getBackgroundImage2_gpu(backgroundImage.channels(), bgmodelUsedModes_, weight_, mean_, backgroundImage, constantsDevice_, StreamAccessor::getStream(stream));
}
void MOG2Impl::initialize(cv::Size frameSize, int frameType)
void MOG2Impl::initialize(cv::Size frameSize, int frameType, Stream &stream)
{
using namespace cv::cuda::device::mog2;
@ -226,24 +224,24 @@ namespace
frameType_ = frameType;
nframes_ = 0;
int ch = CV_MAT_CN(frameType);
int work_ch = ch;
const int ch = CV_MAT_CN(frameType);
const int work_ch = ch;
// for each gaussian mixture of each pixel bg model we store ...
// the mixture weight (w),
// the mean (nchannels values) and
// the covariance
weight_.create(frameSize.height * nmixtures_, frameSize_.width, CV_32FC1);
variance_.create(frameSize.height * nmixtures_, frameSize_.width, CV_32FC1);
mean_.create(frameSize.height * nmixtures_, frameSize_.width, CV_32FC(work_ch));
weight_.create(frameSize.height * getNMixtures(), frameSize_.width, CV_32FC1);
variance_.create(frameSize.height * getNMixtures(), frameSize_.width, CV_32FC1);
mean_.create(frameSize.height * getNMixtures(), frameSize_.width, CV_32FC(work_ch));
//make the array for keeping track of the used modes per pixel - all zeros at start
bgmodelUsedModes_.create(frameSize_, CV_8UC1);
bgmodelUsedModes_.setTo(Scalar::all(0));
loadConstants(nmixtures_, varThreshold_, backgroundRatio_, varThresholdGen_, varInit_, varMin_, varMax_, shadowThreshold_, shadowValue_);
}
cudaSafeCall(cudaMemcpyAsync(constantsDevice_, &constantsHost_, sizeof(Constants), cudaMemcpyHostToDevice, StreamAccessor::getStream(stream)));
}
} // namespace
Ptr<cuda::BackgroundSubtractorMOG2> cv::cuda::createBackgroundSubtractorMOG2(int history, double varThreshold, bool detectShadows)
{

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