void HighPassFilter::applyLowPass(const Image2DPtr &image) { // Guassian convolution can be separated in two 1D convolution // because of properties of the 2D Gaussian function. Image2DPtr temp = Image2D::CreateZeroImagePtr(image->Width(), image->Height()); size_t hKernelMid = _hWindowSize/2; for(size_t i=0; i<_hWindowSize; ++i) { const num_t kernelValue = _hKernel[i]; const size_t xStart = (i >= hKernelMid) ? 0 : (hKernelMid-i), xEnd = (i <= hKernelMid) ? image->Width() : image->Width()-i+hKernelMid; for(unsigned y=0;y<image->Height();++y) { for(unsigned x=xStart;x<xEnd;++x) temp->AddValue(x, y, image->Value(x+i-hKernelMid, y)*kernelValue); } } image->SetAll(0.0); size_t vKernelMid = _vWindowSize/2; for(size_t i=0; i<_vWindowSize; ++i) { const num_t kernelValue = _vKernel[i]; const size_t yStart = (i >= vKernelMid) ? 0 : (vKernelMid-i), yEnd = (i <= vKernelMid) ? image->Height() : image->Height()-i+vKernelMid; for(unsigned y=yStart;y<yEnd;++y) { for(unsigned x=0;x<image->Width();++x) image->AddValue(x, y, temp->Value(x, y+i-vKernelMid)*kernelValue); } } }
void TimeConvolutionAction::PerformFFTSincOperation(ArtifactSet &artifacts, Image2DPtr real, Image2DPtr imag) const { fftw_complex *fftIn = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * real->Width()), *fftOut = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * real->Width()); // FFTW plan routines are not thread safe, so lock. boost::mutex::scoped_lock lock(artifacts.IOMutex()); fftw_plan fftPlanForward = fftw_plan_dft_1d(real->Width(), fftIn, fftOut, FFTW_FORWARD, FFTW_MEASURE), fftPlanBackward = fftw_plan_dft_1d(real->Width(), fftIn, fftOut, FFTW_BACKWARD, FFTW_MEASURE); lock.unlock(); const size_t width = real->Width(); const BandInfo band = artifacts.MetaData()->Band(); for(unsigned y=0;y<real->Height();++y) { const numl_t sincScale = ActualSincScaleInSamples(artifacts, band.channels[y].frequencyHz); const numl_t limitFrequency = (numl_t) width / sincScale; if(y == real->Height()/2) { AOLogger::Debug << "Horizontal sinc scale: " << sincScale << " (filter scale: " << Angle::ToString(ActualSincScaleAsRaDecDist(artifacts, band.channels[y].frequencyHz)) << ")\n"; } if(sincScale > 1.0) { for(unsigned x=0;x<width;++x) { fftIn[x][0] = real->Value(x, y); fftIn[x][1] = imag->Value(x, y); } fftw_execute_dft(fftPlanForward, fftIn, fftOut); size_t filterIndexSize = (limitFrequency > 1.0) ? (size_t) ceil(limitFrequency/2.0) : 1; // Remove the high frequencies [filterIndexSize : n-filterIndexSize] for(size_t f=filterIndexSize;f<width - filterIndexSize;++f) { fftOut[f][0] = 0.0; fftOut[f][1] = 0.0; } fftw_execute_dft(fftPlanBackward, fftOut, fftIn); const double n = width; for(unsigned x=0;x<width;++x) { real->SetValue(x, y, fftIn[x][0] / n); imag->SetValue(x, y, fftIn[x][1] / n); } } } fftw_free(fftIn); fftw_free(fftOut); }
void HighPassFilter::elementWiseDivide(const Image2DPtr &leftHand, const Image2DCPtr &rightHand) { for(unsigned y=0;y<leftHand->Height();++y) { for(unsigned x=0;x<leftHand->Width();++x) { if(rightHand->Value(x, y) == 0.0) leftHand->SetValue(x, y, 0.0); else leftHand->SetValue(x, y, leftHand->Value(x, y) / rightHand->Value(x, y)); } } }
std::pair<num_t, num_t> SpatialCompositionAction::removeEigenvalue(Image2DCPtr real, Image2DCPtr imaginary) const { try { Image2DPtr r = Image2D::CreateCopy(real), i = Image2D::CreateCopy(imaginary); for(size_t y=0;y<r->Height();++y) { for(size_t x=0;x<r->Width();++x) { if(!std::isfinite(r->Value(x,y))) r->SetValue(x, y, 0.0); if(!std::isfinite(i->Value(x,y))) i->SetValue(x, y, 0.0); } } if(r->ContainsOnlyZeros() && i->ContainsOnlyZeros()) return std::pair<num_t, num_t>(0.0, 0.0); Eigenvalue::Remove(r, i); return std::pair<num_t, num_t>(r->Value(0,1), i->Value(0,1)); } catch(std::exception &e) { return std::pair<num_t, num_t>(std::numeric_limits<num_t>::quiet_NaN(), std::numeric_limits<num_t>::quiet_NaN()); } }