1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
/*
* Copyright (C) 2005-2022 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
* https://www.orfeo-toolbox.org/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "otbImageFileReader.h"
#include "otbLineSegmentDetector.h"
#include "otbVectorDataFileWriter.h"
/* Example usage:
./RightAngleDetectionExample Input/Scene.png Output/rightAngleOutput.shp 0.1 20
*/
// This example illustrates the use of the
// \doxygen{otb}{VectorDataToRightAngleVectorDataFilter}.
// This filter detects the right angles in an image by exploiting the
// output of a line detection algorithm. Typically the
// \doxygen{otb}{LineSegmentDetector} class will be used. The right
// angle detection algorithm is described in detail in
// \cite{RightAngleDetection}.
//
// The first step required to use this filter is to include its header file.
#include "otbVectorDataToRightAngleVectorDataFilter.h"
int main(int argc, char* argv[])
{
if (argc != 5)
{
std::cerr << "Usage: ./RightAngleDetectionExample input rightAngleOutput angleThreshold distanceThreshold\n";
return EXIT_FAILURE;
}
const char* infname = argv[1];
const char* rightAngleOutputFilename = argv[2];
double angleThreshold = atof(argv[3]);
double distanceThreshold = atof(argv[4]);
const unsigned int Dimension = 2;
using PixelType = unsigned char;
using PrecisionType = double;
using ImageType = otb::Image<PixelType, Dimension>;
using ReaderType = otb::ImageFileReader<ImageType>;
auto reader = ReaderType::New();
reader->SetFileName(infname);
reader->GenerateOutputInformation();
// After defining, as usual, the types for the input image and the
// image reader, we define the specific types needed for this
// example. First of all, we will use a vector data
// to store the detected lines which will be provided by the line
// segment detector.
using VectorDataType = otb::VectorData<PrecisionType>;
// The right angle detector's output is a vector data where each point
// gives the coordinate of the detected angle.
//
// Next, We define the type for the line segment detector. A detailed
// example for this detector can be found in section \ref{sec:LSD}.
using LsdFilterType = otb::LineSegmentDetector<ImageType, PrecisionType>;
// We can finally define the type for the right angle detection
// filter. This filter is templated over the input vector data type
// provided by the line segment detector.
using RightAngleFilterType = otb::VectorDataToRightAngleVectorDataFilter<VectorDataType>;
// We instantiate the line segment detector and the right angle detector.
auto lsdFilter = LsdFilterType::New();
auto rightAngleFilter = RightAngleFilterType::New();
// We plug the pipeline.
lsdFilter->SetInput(reader->GetOutput());
rightAngleFilter->SetInput(lsdFilter->GetOutput());
// You can choose how far the right angle segments can be, and the tolerance
// to consider an angle between two segments as an right one.
rightAngleFilter->SetAngleThreshold(angleThreshold);
rightAngleFilter->SetDistanceThreshold(distanceThreshold);
using WriterType = otb::VectorDataFileWriter<LsdFilterType::VectorDataType>;
auto rightAngleWriter = WriterType::New();
rightAngleWriter->SetInput(rightAngleFilter->GetOutput());
rightAngleWriter->SetFileName(rightAngleOutputFilename);
// Before calling the \code{Update()} method of the writers in order to
// trigger the pipeline execution, we call the
// \code{GenerateOutputInformation()} of the reader, so the
// filter gets the information about image size and spacing.
reader->GenerateOutputInformation();
rightAngleWriter->Update();
return EXIT_SUCCESS;
}
|
