Support for XISF
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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/IntegerResample.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_IntegerResample_h
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#define __PCL_IntegerResample_h
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/// \file pcl/IntegerResample.h
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#include <pcl/Defs.h>
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#include <pcl/Diagnostics.h>
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#include <pcl/GeometricTransformation.h>
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namespace pcl
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{
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// ----------------------------------------------------------------------------
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/*!
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* \namespace pcl::IntegerDownsampleMode
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* \brief Downsampling operations for IntegerResample.
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*
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* <table border="1" cellpadding="4" cellspacing="0">
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* <tr><td>IntegerDownsampleMode::Average</td> <td>Downsample by averaging source pixels</td></tr>
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* <tr><td>IntegerDownsampleMode::Median</td> <td>Downsample by calculating the median of source pixels</td></tr>
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* <tr><td>IntegerDownsampleMode::Maximum</td> <td>Downsample by the maximum source pixel value</td></tr>
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* <tr><td>IntegerDownsampleMode::Minimum</td> <td>Downsample by the minimum source pixel value</td></tr>
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* </table>
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*/
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namespace IntegerDownsampleMode
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{
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enum value_type
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{
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Average,
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Median,
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Maximum,
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Minimum
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};
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}
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// ----------------------------------------------------------------------------
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/*!
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* \class IntegerResample
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* \brief A geometric transformation to resample images by integer ratios.
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*
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* ### TODO: Write a detailed description for %IntegerResample.
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*/
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class PCL_CLASS IntegerResample : public GeometricTransformation
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{
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public:
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/*!
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* Represents a downsample operation.
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*/
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typedef IntegerDownsampleMode::value_type downsample_mode;
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/*!
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* Constructs an %IntegerResample object with zoom factor \a z and
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* downsampling mode \a m.
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*/
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IntegerResample( int zoom = 0, downsample_mode mode = IntegerDownsampleMode::Average )
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: m_zoomFactor( zoom )
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, m_downsampleMode( mode )
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{
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}
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/*!
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* Copy constructor.
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*/
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IntegerResample( const IntegerResample& ) = default;
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/*!
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* Returns the current zoom factor of this %IntegerResample object.
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*/
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int ZoomFactor() const
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{
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return m_zoomFactor;
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}
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/*!
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* Sets the \a zoom factor for this %IntegerResample object.
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*
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* Positive zoom factors are interpreted as magnifying factors; negative
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* zoom factors are reduction factors. For example:
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*
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* <table border="1" cellpadding="4" cellspacing="0">
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* <tr align="center"><td><b>Zoom Factor</b></td> <td><b>Resampling ratio (original pixels : resampled pixels)</b></td></tr>
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* <tr align="center"><td>-3</td> <td>1:3 (1/3 reduction)</td></tr>
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* <tr align="center"><td>-2</td> <td>1:2 (1/2 reduction)</td></tr>
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* <tr align="center"><td>1</td> <td>1:1 (actual pixels)</td></tr>
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* <tr align="center"><td>2</td> <td>2:1 (x2 magnification)</td></tr>
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* <tr align="center"><td>3</td> <td>3:1 (x3 magnification)</td></tr>
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* </table>
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*
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* \note Zoom factors 0 and -1 should not be used explicitly; they are
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* reserved for internal use, and there is no guarantee that future versions
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* of PCL will continue accepting them.
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*/
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void SetZoomFactor( int zoom )
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{
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m_zoomFactor = (zoom < -1 || zoom > +1) ? zoom : +1;
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}
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/*!
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* Returns the pixel scaling factor applied by this instance, or the
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* equivalent image resampling ratio. See SetZoomFactor() for the
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* correspondence between zoom factors and resampling ratios.
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*/
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double ScalingFactor() const
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{
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if ( m_zoomFactor == 0 )
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return 1;
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return (m_zoomFactor < 0) ? 1.0/(-m_zoomFactor) : double( m_zoomFactor );
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}
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/*!
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* Returns the current downsample mode of this %IntegerResample object.
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*/
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downsample_mode DownsampleMode() const
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{
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return m_downsampleMode;
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}
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/*!
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* Sets the downsample \e mode for this %IntegerResample object.
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*
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* The downsample mode defines an statistical operation that the integer
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* resampling algorithms applies to the set of original pixels that produce
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* each pixel in the subsampled image. The default mode is
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* IntegerDownsampleMode::Average, which calculates the mean of source
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* pixels. The Median, Minimum and Maximum modes turn the integer
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* downsampling algorithm into a <em>morphological downsampling</em>
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* operation with very interesting properties and applications.
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*/
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void SetDownsampleMode( downsample_mode mode )
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{
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m_downsampleMode = mode;
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}
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/*!
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*/
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void GetNewSizes( int& width, int& height ) const override;
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protected:
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/*
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* Zoom factor: > 1 -> zoom in, < 1 -> zoom out, from -1 to +1 -> no change.
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*/
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int m_zoomFactor = 0;
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/*
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* Downsample mode: average, median, maximum, minimum; see enumeration above.
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*/
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downsample_mode m_downsampleMode = IntegerDownsampleMode::Average;
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// Inherited from ImageTransformation.
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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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};
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// ----------------------------------------------------------------------------
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} // pcl
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#endif // __PCL_IntegerResample_h
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// ----------------------------------------------------------------------------
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// EOF pcl/IntegerResample.h - Released 2022-03-12T18:59:29Z
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