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LSST Data Management Base Package
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rotateImage.cc
Go to the documentation of this file.
1/*
2 * LSST Data Management System
3 * Copyright 2008, 2009, 2010 LSST Corporation.
4 *
5 * This product includes software developed by the
6 * LSST Project (http://www.lsst.org/).
7 *
8 * This program is free software: you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation, either version 3 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the LSST License Statement and
19 * the GNU General Public License along with this program. If not,
20 * see <http://www.lsstcorp.org/LegalNotices/>.
21 */
22
23/*
24 * Rotate an Image (or Mask or MaskedImage) by a fixed angle or number of quarter turns
25 */
26#include <memory>
27#include <cstdint>
28
29#include "lsst/geom.h"
31
32namespace afwImage = lsst::afw::image;
33
34namespace lsst {
35namespace afw {
36namespace math {
37
38template <typename ImageT>
39std::shared_ptr<ImageT> rotateImageBy90(ImageT const& inImage, int nQuarter) {
40 std::shared_ptr<ImageT> outImage; // output image
41
42 while (nQuarter < 0) {
43 nQuarter += 4;
44 }
45
46 switch (nQuarter % 4) {
47 case 0:
48 outImage.reset(new ImageT(inImage, true)); // a deep copy of inImage
49 break;
50 case 1:
51 outImage.reset(new ImageT(lsst::geom::Extent2I(inImage.getHeight(), inImage.getWidth())));
52
53 for (int y = 0; y != inImage.getHeight(); ++y) {
54 typename ImageT::y_iterator optr = outImage->col_begin(inImage.getHeight() - y - 1);
55 for (typename ImageT::x_iterator iptr = inImage.row_begin(y), end = inImage.row_end(y);
56 iptr != end; ++iptr, ++optr) {
57 *optr = *iptr;
58 }
59 }
60
61 break;
62 case 2:
63 outImage.reset(new ImageT(inImage.getDimensions()));
64
65 for (int y = 0; y != inImage.getHeight(); ++y) {
66 typename ImageT::x_iterator optr =
67 outImage->x_at(inImage.getWidth() - 1, inImage.getHeight() - y - 1);
68 for (typename ImageT::x_iterator iptr = inImage.row_begin(y), end = inImage.row_end(y);
69 iptr != end; ++iptr, optr -= 1) {
70 *optr = *iptr;
71 }
72 }
73 break;
74 case 3:
75 outImage.reset(new ImageT(lsst::geom::Extent2I(inImage.getHeight(), inImage.getWidth())));
76
77 for (int y = 0; y != inImage.getHeight(); ++y) {
78 typename ImageT::y_iterator optr = outImage->y_at(y, inImage.getWidth() - 1);
79 for (typename ImageT::x_iterator iptr = inImage.row_begin(y), end = inImage.row_end(y);
80 iptr != end; ++iptr, optr -= 1) {
81 *optr = *iptr;
82 }
83 }
84
85 break;
86 }
87
88 return outImage;
89}
90
91template <typename ImageT>
92std::shared_ptr<ImageT> flipImage(ImageT const& inImage, bool flipLR, bool flipTB) {
93 std::shared_ptr<ImageT> outImage(new ImageT(inImage, true)); // Output image
94
95 if (flipLR) {
96 if (flipTB) {
97 for (int y = 0; y != inImage.getHeight(); ++y) {
98 typename ImageT::x_iterator optr =
99 outImage->x_at(inImage.getWidth() - 1, inImage.getHeight() - y - 1);
100 for (typename ImageT::x_iterator iptr = inImage.row_begin(y), end = inImage.row_end(y);
101 iptr != end; ++iptr, optr -= 1) {
102 *optr = *iptr;
103 }
104 }
105 } else {
106 for (int y = 0; y != inImage.getHeight(); ++y) {
107 typename ImageT::x_iterator optr = outImage->x_at(inImage.getWidth() - 1, y);
108 for (typename ImageT::x_iterator iptr = inImage.row_begin(y), end = inImage.row_end(y);
109 iptr != end; ++iptr, optr -= 1) {
110 *optr = *iptr;
111 }
112 }
113 }
114 } else {
115 if (flipTB) {
116 for (int y = 0; y != inImage.getHeight(); ++y) {
117 typename ImageT::x_iterator optr = outImage->row_begin(inImage.getHeight() - y - 1);
118 for (typename ImageT::x_iterator iptr = inImage.row_begin(y), end = inImage.row_end(y);
119 iptr != end; ++iptr, ++optr) {
120 *optr = *iptr;
121 }
122 }
123 } else {
124 ; // nothing to do
125 }
126 }
127
128 return outImage;
129}
130
131//
132// Explicit instantiations
133//
135#define INSTANTIATE(TYPE) \
136 template std::shared_ptr<afwImage::Image<TYPE>> rotateImageBy90(afwImage::Image<TYPE> const&, int); \
137 template std::shared_ptr<afwImage::MaskedImage<TYPE>> rotateImageBy90( \
138 afwImage::MaskedImage<TYPE> const&, int); \
139 template std::shared_ptr<afwImage::Image<TYPE>> flipImage(afwImage::Image<TYPE> const&, bool flipLR, \
140 bool flipTB); \
141 template std::shared_ptr<afwImage::MaskedImage<TYPE>> flipImage(afwImage::MaskedImage<TYPE> const&, \
142 bool flipLR, bool flipTB);
143
145INSTANTIATE(int)
146INSTANTIATE(float)
147INSTANTIATE(double)
151 afwImage::Mask<afwImage::MaskPixel> const&, bool flipLR, bool flipTB);
153} // namespace math
154} // namespace afw
155} // namespace lsst
int end
#define INSTANTIATE(FROMSYS, TOSYS)
Definition Detector.cc:509
int y
Definition SpanSet.cc:48
Represent a 2-dimensional array of bitmask pixels.
Definition Mask.h:77
std::shared_ptr< ImageT > rotateImageBy90(ImageT const &image, int nQuarter)
Rotate an image by an integral number of quarter turns.
std::shared_ptr< ImageT > flipImage(ImageT const &inImage, bool flipLR, bool flipTB)
Flip an image left–right and/or top–bottom.
T reset(T... args)