ITK  6.0.0
Insight Toolkit
itkLabelToRGBFunctor.h
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1/*=========================================================================
2 *
3 * Copyright NumFOCUS
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * https://www.apache.org/licenses/LICENSE-2.0.txt
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 *=========================================================================*/
18#ifndef itkLabelToRGBFunctor_h
19#define itkLabelToRGBFunctor_h
20
21#include <vector>
22#include "itkNumericTraits.h"
23
24namespace itk
25{
26namespace Functor
27{
49template <typename TLabel, typename TRGBPixel>
51{
52public:
54
56 {
57 using ValueType = typename TRGBPixel::ValueType;
58
59 // the following colors are from "R", and named:
60 // "red" "green3" "blue" "cyan"
61 //"magenta" "darkorange1" "darkgreen" "blueviolet"
62 //"brown4" "navy" "yellow4" "violetred1"
63 //"salmon4" "turquoise4" "sienna3" "darkorchid1"
64 //"springgreen4" "mediumvioletred" "orangered3" "lightseagreen"
65 //"slateblue" "deeppink1" "aquamarine4" "royalblue1"
66 //"tomato3" "mediumblue" "violetred4" "darkmagenta"
67 //"violet" "red4"
68 // They are a good selection of distinct colors for plotting and
69 // overlays.
70 constexpr size_t numColors = 30;
71 constexpr unsigned char colors[numColors][3] = {
72 { 255, 0, 0 }, { 0, 205, 0 }, { 0, 0, 255 }, { 0, 255, 255 }, { 255, 0, 255 }, { 255, 127, 0 },
73 { 0, 100, 0 }, { 138, 43, 226 }, { 139, 35, 35 }, { 0, 0, 128 }, { 139, 139, 0 }, { 255, 62, 150 },
74 { 139, 76, 57 }, { 0, 134, 139 }, { 205, 104, 57 }, { 191, 62, 255 }, { 0, 139, 69 }, { 199, 21, 133 },
75 { 205, 55, 0 }, { 32, 178, 170 }, { 106, 90, 205 }, { 255, 20, 147 }, { 69, 139, 116 }, { 72, 118, 255 },
76 { 205, 79, 57 }, { 0, 0, 205 }, { 139, 34, 82 }, { 139, 0, 139 }, { 238, 130, 238 }, { 139, 0, 0 }
77 };
78
79 for (auto & color : colors)
80 {
81 AddColor(color[0], color[1], color[2]);
82 }
83
84 // provide some default value for external use (outside
85 // LabelToRGBImageFilter)
86 // Inside LabelToRGBImageFilter, the values are always initialized
88 m_BackgroundColor.Fill(ValueType{});
89 m_BackgroundValue = TLabel{};
90 }
91
92 inline TRGBPixel
93 operator()(const TLabel & p) const
94 {
95 // value is background
96 // return a gray pixel with the same intensity than the label pixel
97 if (p == m_BackgroundValue)
98 {
99 return m_BackgroundColor;
100 }
101
102 // else, return a colored pixel from the color table
103 return m_Colors[p % m_Colors.size()];
104 }
105
106 void
107 AddColor(unsigned char r, unsigned char g, unsigned char b)
108 {
109 TRGBPixel rgbPixel;
111
112 using ValueType = typename TRGBPixel::ValueType;
113
114 ValueType m = NumericTraits<ValueType>::max();
115
116 rgbPixel[0] = static_cast<ValueType>(static_cast<double>(r) / 255 * m);
117 rgbPixel[1] = static_cast<ValueType>(static_cast<double>(g) / 255 * m);
118 rgbPixel[2] = static_cast<ValueType>(static_cast<double>(b) / 255 * m);
119 m_Colors.push_back(rgbPixel);
120 }
121
122 // Empty the color LUT
123 void
125 {
126 m_Colors.clear();
127 }
128
129 // Get number of colors in the LUT
130 unsigned int
132 {
133 return static_cast<unsigned int>(m_Colors.size());
134 }
135
136 bool
137 operator==(const Self & other) const
138 {
140 m_Colors == other.m_Colors;
141 }
142
144
145 void
147 {
149 }
150
151 void
152 SetBackgroundColor(TRGBPixel rgb)
153 {
154 m_BackgroundColor = rgb;
155 }
156
158
159 std::vector<TRGBPixel> m_Colors;
160
162
164};
165} // end namespace Functor
166} // end namespace itk
167
168#endif
Functor for converting labels into RGB triplets.
std::vector< TRGBPixel > m_Colors
bool operator==(const Self &other) const
void AddColor(unsigned char r, unsigned char g, unsigned char b)
TRGBPixel operator()(const TLabel &p) const
static constexpr T max(const T &)
static void SetLength(T &m, const unsigned int s)
The "itk" namespace contains all Insight Segmentation and Registration Toolkit (ITK) classes....