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// ____ ______ __
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// / __ \ / ____// /
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// / /_/ // / / /
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// / ____// /___ / /___ PixInsight Class Library
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// /_/ \____//_____/ PCL 2.4.23
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// ----------------------------------------------------------------------------
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// pcl/Convolution.h - Released 2022-03-12T18:59:29Z
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// ----------------------------------------------------------------------------
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// This file is part of the PixInsight Class Library (PCL).
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// PCL is a multiplatform C++ framework for development of PixInsight modules.
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//
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// Copyright (c) 2003-2022 Pleiades Astrophoto S.L. All Rights Reserved.
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//
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// Redistribution and use in both source and binary forms, with or without
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// modification, is permitted provided that the following conditions are met:
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//
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// 1. All redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// 2. All redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// 3. Neither the names "PixInsight" and "Pleiades Astrophoto", nor the names
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// of their contributors, may be used to endorse or promote products derived
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// from this software without specific prior written permission. For written
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// permission, please contact info@pixinsight.com.
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//
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// 4. All products derived from this software, in any form whatsoever, must
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// reproduce the following acknowledgment in the end-user documentation
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// and/or other materials provided with the product:
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//
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// "This product is based on software from the PixInsight project, developed
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// by Pleiades Astrophoto and its contributors (https://pixinsight.com/)."
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//
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// Alternatively, if that is where third-party acknowledgments normally
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// appear, this acknowledgment must be reproduced in the product itself.
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//
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// THIS SOFTWARE IS PROVIDED BY PLEIADES ASTROPHOTO AND ITS CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL PLEIADES ASTROPHOTO OR ITS
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, BUSINESS
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// INTERRUPTION; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; AND LOSS OF USE,
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// DATA OR PROFITS) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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// ----------------------------------------------------------------------------
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#ifndef __PCL_Convolution_h
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#define __PCL_Convolution_h
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/// \file pcl/Convolution.h
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#include <pcl/Defs.h>
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#include <pcl/Diagnostics.h>
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#include <pcl/AutoPointer.h>
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#include <pcl/InterlacedTransformation.h>
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#include <pcl/KernelFilter.h>
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#include <pcl/ParallelProcess.h>
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#include <pcl/ThresholdedTransformation.h>
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#define __PCL_CONVOLUTION_TINY_WEIGHT 1.0e-20
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namespace pcl
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{
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// ----------------------------------------------------------------------------
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/*!
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* \class Convolution
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* \brief Discrete two-dimensional nonseparable convolution in the spatial
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* domain
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*
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* %Convolution implements a fully multithreaded, two-dimensional discrete
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* nonseparable convolution algorithm. It performs automatic fixing of
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* border artifacts by applying Neumann boundary conditions (mirroring).
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*
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* \note ImageTransformation is a virtual base class of %Convolution.
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*
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* \sa SeparableConvolution, FFTConvolution, KernelFilter
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*/
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class PCL_CLASS Convolution : public InterlacedTransformation,
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public ThresholdedTransformation,
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public ParallelProcess
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{ // NB: ImageTransformation is a virtual base class
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public:
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/*!
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* Default constructor.
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*
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* \note This constructor yields an uninitialized instance that cannot be
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* used before explicit association with a KernelFilter instance.
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*/
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Convolution() = default;
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/*!
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* Constructs a %Convolution instance with the specified filter.
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*
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* \param filter Response function, or <em>convolution filter</em>. The
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* specified object does not have to remain valid while this
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* instance is actively used, since %Convolution owns a
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* private copy of the filter (note that KernelFilter is a
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* reference-counted class).
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*/
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Convolution( const KernelFilter& filter )
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{
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SetFilter( filter );
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}
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/*!
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* Copy constructor.
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*/
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Convolution( const Convolution& x )
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: InterlacedTransformation( x )
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, ThresholdedTransformation( x )
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, ParallelProcess( x )
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, m_weight( x.m_weight )
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, m_highPass( x.m_highPass )
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, m_rawHighPass( x.m_rawHighPass )
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, m_rescaleHighPass( x.m_rescaleHighPass )
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{
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if ( !x.m_filter.IsNull() )
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m_filter = x.m_filter->Clone();
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}
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/*!
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* Move constructor.
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*/
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Convolution( Convolution&& ) = default;
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/*!
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* Destroys this %Convolution object.
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*/
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virtual ~Convolution()
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{
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}
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/*!
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* Copy assignment operator. Returns a reference to this object.
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*/
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Convolution& operator =( const Convolution& x )
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{
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if ( &x != this )
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{
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(void)InterlacedTransformation::operator =( x );
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(void)ThresholdedTransformation::operator =( x );
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(void)ParallelProcess::operator =( x );
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if ( x.m_filter.IsNull() )
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m_filter.Destroy();
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else
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m_filter = x.m_filter->Clone();
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m_weight = x.m_weight;
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m_highPass = x.m_highPass;
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m_rawHighPass = x.m_rawHighPass;
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m_rescaleHighPass = x.m_rescaleHighPass;
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}
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return *this;
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}
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/*!
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* Move assignment operator. Returns a reference to this object.
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*/
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Convolution& operator =( Convolution&& ) = default;
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/*!
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* Returns a reference to the kernel filter currently associated with this
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* %Convolution object.
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*
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* If this object has not been initialized, this member function returns an
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* empty kernel filter.
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*/
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const KernelFilter& Filter() const
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{
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PCL_PRECONDITION( !m_filter.IsNull() )
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return *m_filter;
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}
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/*!
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* Sets a new kernel \a filter to be applied by this %Convolution object.
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*/
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void SetFilter( const KernelFilter& filter )
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{
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m_filter = filter.Clone();
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CacheFilterProperties();
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}
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/*!
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* Returns the current filter weight. The filter weight is computed each
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* time a kernel filter is associated with this object. It is only
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* applied for low-pass filters as a normalization factor. For more
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* information, see the documentation for KernelFilter::Weight().
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*
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* The filter weight and other filter properties are cached in private data
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* members for quick reference.
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*/
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double FilterWeight() const
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{
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return m_weight;
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}
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/*!
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* Returns true if the kernel filter currently associated with this
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* %Convolution object is a high-pass filter; false if it is a low-pass
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* filter. For more information, see the documentation for
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* kernelFilter::IsHighPassFilter().
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*
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* Each time a kernel filter is associated with this object, its high-pass
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* nature is checked and stored, along with other filter properties, in
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* private data members. This allows for quick lookup of critical filter
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* characteristics without degrading performance.
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*/
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bool IsHighPassFilter() const
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{
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return m_highPass;
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}
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/*!
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* Returns true iff out-of-range values will be rescaled for normalization of
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* images after convolution with a high-pass filter.
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*
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* A high-pass filter has negative coefficients. As a result, some pixels in
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* the convolved image may have negative values. Saturated pixels (values
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* above one) can also result, depending on the filter coefficients. The
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* standard behavior is to truncate out-of-range pixel values to the [0,1]
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* range, which preserves the dynamics of the convolved image, so high-pass
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* rescaling is disabled by default. When high-pass rescaling is enabled,
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* the resulting image is \e normalized (that is, rescaled to [0,1] only if
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* there are out-of-range values) and hence all the data after convolution
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* are preserved at the cost of reducing the overall contrast of the image.
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* Finally, if <em>raw high-pass convolution</em> has been enabled,
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* out-of-range values are neither truncated nor rescaled irrespective of
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* the value returned by this function. See the documentation for
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* IsRawHighPassEnabled() for more information.
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*/
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bool IsHighPassRescalingEnabled() const
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{
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return m_rescaleHighPass;
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}
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/*!
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* Enables (or disables) high-pass rescaling of out-of-range convolved pixel
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* values. See the documentation for IsHighPassRescalingEnabled() for more
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* information.
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*/
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void EnableHighPassRescaling( bool enable = true )
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{
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m_rescaleHighPass = enable;
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}
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/*!
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* Disables (or enables) high-pass rescaling of out-of-range convolved pixel
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* values. See the documentation for IsHighPassRescalingEnabled() for more
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* information.
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*/
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void DisableHighPassRescaling( bool disable = true )
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{
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EnableHighPassRescaling( !disable );
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}
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/*!
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* Returns true iff <em>raw high-pass convolution</em> is enabled. When raw
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* high-pass convolution is enabled, out-of-range values after convolution
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* with a high-pass filter are neither truncated nor normalized. Note that
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* this is only relevant to convolution of floating point data.
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*
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* Raw high-pass convolution is disabled by default. For more information on
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* out-of-range convolution results, refer to the documentation for
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* IsHighPassRescalingEnabled().
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*/
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bool IsRawHighPassEnabled() const
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{
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return m_rawHighPass;
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}
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/*!
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* Enables (or disables) raw high-pass convolution. See the documentation
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* for IsRawHighPassEnabled() for more information.
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*/
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void EnableRawHighPass( bool enable = true )
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{
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m_rawHighPass = enable;
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}
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/*!
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* Disables (or enables) raw high-pass convolution. See the documentation
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* for IsRawHighPassEnabled() for more information.
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*/
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void DisableRawHighPass( bool disable = true )
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{
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EnableRawHighPass( !disable );
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}
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/*!
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* Returns the length in pixels of the overlapping regions between adjacent
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* areas processed by parallel execution threads. The overlapping distance
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* is a function of the filter size and the interlacing distance.
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*/
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int OverlappingDistance() const
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{
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PCL_PRECONDITION( !m_filter.IsNull() )
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return m_filter->Size() + (m_filter->Size() - 1)*(InterlacingDistance() - 1);
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}
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protected:
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/*
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* The response function for convolution is defined as a kernel filter.
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*/
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AutoPointer<KernelFilter> m_filter;
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/*
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* Cached filter properties.
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*/
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double m_weight = 0; // filter weight for low-pass normalization
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bool m_highPass = false; // true if this is a high-pass filter
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/*
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* User-selectable options
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*/
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bool m_rawHighPass = false; // neither truncate nor normalize out-of-range values
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bool m_rescaleHighPass = false; // truncate out-of-range values instead of normalize
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/*
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* In-place 2-D nonseparable convolution algorithm in the spatial domain.
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*/
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void Apply( pcl::Image& ) const override;
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void Apply( pcl::DImage& ) const override;
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void Apply( pcl::UInt8Image& ) const override;
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void Apply( pcl::UInt16Image& ) const override;
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void Apply( pcl::UInt32Image& ) const override;
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private:
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void CacheFilterProperties()
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{
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PCL_PRECONDITION( !m_filter.IsNull() )
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PCL_PRECONDITION( !m_filter->IsEmpty() )
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ValidateFilter();
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m_highPass = m_filter->IsHighPassFilter();
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m_weight = m_filter->Weight();
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if ( pcl::Abs( m_weight ) < __PCL_CONVOLUTION_TINY_WEIGHT )
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m_weight = 1;
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}
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void ValidateFilter() const;
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};
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// ----------------------------------------------------------------------------
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} // pcl
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#endif // __PCL_Convolution_h
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// ----------------------------------------------------------------------------
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// EOF pcl/Convolution.h - Released 2022-03-12T18:59:29Z
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