opencv_annotation.cpp 10.4 KB
Newer Older
wester committed
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287
////////////////////////////////////////////////////////////////////////////////////////
//
//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
//  By downloading, copying, installing or using the software you agree to this license.
//  If you do not agree to this license, do not download, install,
//  copy or use the software.
//
//
//                          License Agreement
//                For Open Source Computer Vision Library
//
// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
// Copyright (C) 2013, OpenCV Foundation, all rights reserved.
// Third party copyrights are property of their respective owners.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
//   * Redistribution's of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//
//   * Redistribution's in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//
//   * The name of the copyright holders may not be used to endorse or promote products
//     derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors "as is" and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
//
////////////////////////////////////////////////////////////////////////////////////////

/*****************************************************************************************************
USAGE:
./opencv_annotation -images <folder location> -annotations <ouput file>

Created by: Puttemans Steven - February 2015
*****************************************************************************************************/

#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/videoio.hpp>
#include <opencv2/imgproc.hpp>

#include <fstream>
#include <iostream>

#if defined(_WIN32)
   #include <direct.h>
#else
   #include <sys/stat.h>
#endif

using namespace std;
using namespace cv;

// Function prototypes
void on_mouse(int, int, int, int, void*);
string int2string(int);
void get_annotations(Mat, stringstream*);

// Public parameters
Mat image;
int roi_x0 = 0, roi_y0 = 0, roi_x1 = 0, roi_y1 = 0, num_of_rec = 0;
bool start_draw = false;

// Window name for visualisation purposes
const string window_name="OpenCV Based Annotation Tool";

// FUNCTION : Mouse response for selecting objects in images
// If left button is clicked, start drawing a rectangle as long as mouse moves
// Stop drawing once a new left click is detected by the on_mouse function
void on_mouse(int event, int x, int y, int , void * )
{
    // Action when left button is clicked
    if(event == EVENT_LBUTTONDOWN)
    {
        if(!start_draw)
        {
            roi_x0 = x;
            roi_y0 = y;
            start_draw = true;
        } else {
            roi_x1 = x;
            roi_y1 = y;
            start_draw = false;
        }
    }
    // Action when mouse is moving
    if((event == EVENT_MOUSEMOVE) && start_draw)
    {
        // Redraw bounding box for annotation
        Mat current_view;
        image.copyTo(current_view);
        rectangle(current_view, Point(roi_x0,roi_y0), Point(x,y), Scalar(0,0,255));
        imshow(window_name, current_view);
    }
}

// FUNCTION : snippet to convert an integer value to a string using a clean function
// instead of creating a stringstream each time inside the main code
string int2string(int num)
{
    stringstream temp_stream;
    temp_stream << num;
    return temp_stream.str();
}

// FUNCTION : given an image containing positive object instances, add all the object
// annotations to a known stringstream
void get_annotations(Mat input_image, stringstream* output_stream)
{
    // Make it possible to exit the annotation
    bool stop = false;

    // Reset the num_of_rec element at each iteration
    // Make sure the global image is set to the current image
    num_of_rec = 0;
    image = input_image;

    // Init window interface and couple mouse actions
    namedWindow(window_name, WINDOW_AUTOSIZE);
    setMouseCallback(window_name, on_mouse);

    imshow(window_name, image);
    stringstream temp_stream;
    int key_pressed = 0;

    do
    {
        // Keys for processing
        // You need to select one for confirming a selection and one to continue to the next image
        // Based on the universal ASCII code of the keystroke: http://www.asciitable.com/
        //      c = 99		    add rectangle to current image
        //	    n = 110		    save added rectangles and show next image
        //	    <ESC> = 27      exit program
        key_pressed = 0xFF & waitKey(0);
        switch( key_pressed )
        {
        case 27:
                destroyWindow(window_name);
                stop = true;
        case 99:
                // Add a rectangle to the list
                num_of_rec++;
                // Draw initiated from top left corner
                if(roi_x0<roi_x1 && roi_y0<roi_y1)
                {
                    temp_stream << " " << int2string(roi_x0) << " " << int2string(roi_y0) << " " << int2string(roi_x1-roi_x0) << " " << int2string(roi_y1-roi_y0);
                }
                // Draw initiated from bottom right corner
                if(roi_x0>roi_x1 && roi_y0>roi_y1)
                {
                    temp_stream << " " << int2string(roi_x1) << " " << int2string(roi_y1) << " " << int2string(roi_x0-roi_x1) << " " << int2string(roi_y0-roi_y1);
                }
                // Draw initiated from top right corner
                if(roi_x0>roi_x1 && roi_y0<roi_y1)
                {
                    temp_stream << " " << int2string(roi_x1) << " " << int2string(roi_y0) << " " << int2string(roi_x0-roi_x1) << " " << int2string(roi_y1-roi_y0);
                }
                // Draw initiated from bottom left corner
                if(roi_x0<roi_x1 && roi_y0>roi_y1)
                {
                    temp_stream << " " << int2string(roi_x0) << " " << int2string(roi_y1) << " " << int2string(roi_x1-roi_x0) << " " << int2string(roi_y0-roi_y1);
                }

                rectangle(input_image, Point(roi_x0,roi_y0), Point(roi_x1,roi_y1), Scalar(0,255,0), 1);

                break;
        }

        // Check if escape has been pressed
        if(stop)
        {
            break;
        }
    }
    // Continue as long as the next image key has not been pressed
    while(key_pressed != 110);

    // If there are annotations AND the next image key is pressed
    // Write the image annotations to the file
    if(num_of_rec>0 && key_pressed==110)
    {
        *output_stream << " " << num_of_rec << temp_stream.str() << endl;
    }

    // Close down the window
    destroyWindow(window_name);
}

int main( int argc, const char** argv )
{
    // If no arguments are given, then supply some information on how this tool works
    if( argc == 1 ){
        cout << "Usage: " << argv[0] << endl;
        cout << " -images <folder_location> [example - /data/testimages/]" << endl;
        cout << " -annotations <ouput_file> [example - /data/annotations.txt]" << endl;

        return -1;
    }

    // Read in the input arguments
    string image_folder;
    string annotations;
    for(int i = 1; i < argc; ++i )
    {
        if( !strcmp( argv[i], "-images" ) )
        {
            image_folder = argv[++i];
        }
        else if( !strcmp( argv[i], "-annotations" ) )
        {
            annotations = argv[++i];
        }
    }

    // Check if the folder actually exists
    // If -1 is returned then the folder actually exists, and thus you can continue
    // In all other cases there was a folder creation and thus the folder did not exist
    #if defined(_WIN32)
    if(_mkdir(image_folder.c_str()) != -1){
        // Generate an error message
        cerr << "The image folder given does not exist. Please check again!" << endl;
        // Remove the created folder again, to ensure a second run with same code fails again
        _rmdir(image_folder.c_str());
        return 0;
    }
    #else
    if(mkdir(image_folder.c_str(), 0777) != -1){
        // Generate an error message
        cerr << "The image folder given does not exist. Please check again!" << endl;
        // Remove the created folder again, to ensure a second run with same code fails again
        remove(image_folder.c_str());
        return 0;
    }
    #endif

    // Create the outputfilestream
    ofstream output(annotations.c_str());
    if ( !output.is_open() ){
        cerr << "The path for the output file contains an error and could not be opened. Please check again!" << endl;
        return 0;
    }

    // Return the image filenames inside the image folder
    vector<String> filenames;
    String folder(image_folder);
    glob(folder, filenames);

    // Loop through each image stored in the images folder
    // Create and temporarily store the annotations
    // At the end write everything to the annotations file
    for (size_t i = 0; i < filenames.size(); i++){
        // Read in an image
        Mat current_image = imread(filenames[i]);

        // Check if the image is actually read - avoid other files in the folder, because glob() takes them all
        // If not then simply skip this iteration
        if(current_image.empty()){
            continue;
        }

        // Perform annotations & generate corresponding output
        stringstream output_stream;
        get_annotations(current_image, &output_stream);

        // Store the annotations, write to the output file
        if (output_stream.str() != ""){
            output << filenames[i] << output_stream.str();
        }
    }

    return 0;
}