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Make some tweaks to make sum operations less frequently

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This commit is contained in:
peng xiao 2013-08-27 11:42:54 +08:00
parent 525b6eca2e
commit 168d1dc18c
2 changed files with 26 additions and 10 deletions
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6
modules/ocl/src/opencl/tvl1flow.cl
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@ -341,7 +341,8 @@ __kernel void estimateUKernel(__global const float* I1wx, int I1wx_col, int I1wx
int u1_offset_x,
int u1_offset_y,
int u2_offset_x,
int u2_offset_y)
int u2_offset_y,
char calc_error)
{
//const int x = blockIdx.x * blockDim.x + threadIdx.x;
@ -399,9 +400,12 @@ __kernel void estimateUKernel(__global const float* I1wx, int I1wx_col, int I1wx
u1[(y + u1_offset_y) * u1_step + x + u1_offset_x] = u1NewVal;
u2[(y + u2_offset_y) * u2_step + x + u2_offset_x] = u2NewVal;
if(calc_error)
{
const float n1 = (u1OldVal - u1NewVal) * (u1OldVal - u1NewVal);
const float n2 = (u2OldVal - u2NewVal) * (u2OldVal - u2NewVal);
error[y * I1wx_step + x] = n1 + n2;
}
}
}

20
modules/ocl/src/tvl1flow.cpp
View File

@ -229,18 +229,29 @@ void cv::ocl::OpticalFlowDual_TVL1_OCL::procOneScale(const oclMat &I0, const ocl
warpBackward(I0, I1, I1x, I1y, u1, u2, I1w, I1wx, I1wy, grad, rho_c);
double error = numeric_limits<double>::max();
double prev_error = 0;
for (int n = 0; error > scaledEpsilon && n < iterations; ++n)
{
// some tweaks to make sum operation less frequently
char calc_error = (n & 0x1) && (prev_error < scaledEpsilon);
estimateU(I1wx, I1wy, grad, rho_c, p11, p12, p21, p22,
u1, u2, diff, l_t, static_cast<float>(theta));
u1, u2, diff, l_t, static_cast<float>(theta), calc_error);
if(calc_error)
{
error = ocl::sum(diff)[0];
prev_error = error;
}
else
{
error = numeric_limits<double>::max();
prev_error -= scaledEpsilon;
}
estimateDualVariables(u1, u2, p11, p12, p21, p22, taut);
}
}
}
void cv::ocl::OpticalFlowDual_TVL1_OCL::collectGarbage()
@ -348,7 +359,7 @@ void ocl_tvl1flow::estimateDualVariables(oclMat &u1, oclMat &u2, oclMat &p11, oc
void ocl_tvl1flow::estimateU(oclMat &I1wx, oclMat &I1wy, oclMat &grad,
oclMat &rho_c, oclMat &p11, oclMat &p12,
oclMat &p21, oclMat &p22, oclMat &u1,
oclMat &u2, oclMat &error, float l_t, float theta)
oclMat &u2, oclMat &error, float l_t, float theta, char calc_error)
{
Context* clCxt = I1wx.clCxt;
@ -401,6 +412,7 @@ void ocl_tvl1flow::estimateU(oclMat &I1wx, oclMat &I1wy, oclMat &grad,
args.push_back( make_pair( sizeof(cl_int), (void*)&u1_offset_y));
args.push_back( make_pair( sizeof(cl_int), (void*)&u2_offset_x));
args.push_back( make_pair( sizeof(cl_int), (void*)&u2_offset_y));
args.push_back( make_pair( sizeof(cl_char), (void*)&calc_error));
openCLExecuteKernel(clCxt, &tvl1flow, kernelName, globalThread, localThread, args, -1, -1);
}