Basic Image AlgorithmS Library  2.8.0
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ExampleJPEGDecompress.cpp
1 /*
2 This file is part of the BIAS library (Basic ImageAlgorithmS).
3 
4 Copyright (C) 2003-2009 (see file CONTACT for details)
5 Multimediale Systeme der Informationsverarbeitung
6 Institut fuer Informatik
7 Christian-Albrechts-Universitaet Kiel
8 
9 
10 BIAS is free software; you can redistribute it and/or modify
11 it under the terms of the GNU Lesser General Public License as published by
12 the Free Software Foundation; either version 2.1 of the License, or
13 (at your option) any later version.
14 
15 BIAS is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU Lesser General Public License for more details.
19 
20 You should have received a copy of the GNU Lesser General Public License
21 along with BIAS; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24 
25 /**
26  @example ExampleJPEGDecompress.cpp
27  @relates CompressJpeg
28  @brief Reads a JPEG image from disk and prints image info.
29  @ingroup g_examples
30  @author Arne Petersen
31 */
32 
33 //#include <Base/Common/LeakChecking.h>
34 #include <Base/Image/ImageBase.hh>
35 #include <Base/Image/ImageIO.hh>
36 #include <Base/Image/CompressJpeg.hh>
37 
38 using namespace BIAS;
39 using namespace std;
40 
41 int main(int argc, char *argv[])
42 {
43  if (argc != 2) {
44  cout << "Usage: " << argv[0] << " <image file>" << endl;
45  return -1;
46  }
47 
48  int res = 0;
50  JpegHandler jHandler;
51  jHandler.Init();
52 
53  res = jHandler.ReadJPEG(argv[1]);
54  if (res < 0) {
55  BIASERR("Reading JPEG failed (returned "<< res <<")!");
56  return -1;
57  }
58  res = jHandler.Decompress(image, true);
59  if (res < 0) {
60  BIASERR("Decompression failed (returned "<< res <<")!");
61  return -1;
62  }
63 
64  cout << "Image size: " << image.GetWidth() << "x"
65  << image.GetHeight() << endl;
66  cout << "Channel count: " << image.GetChannelCount() << endl;
67 
68  if (image.GetMetaData()) {
69  cout << "Image metadata:" << endl;
70  image.GetMetaData()->Dump();
71  } else {
72  cout << "No image metadata found." << endl;
73  }
74 
75  return 0;
76 }
Wrapper for fast libjpeg methods.
Definition: CompressJpeg.hh:50
int ReadJPEG(const std::string &filename)
Read JPEG file named filename and store its informations in compressed data field.
MetaData * GetMetaData()
Definition: ImageBase.hh:436
unsigned int GetWidth() const
Definition: ImageBase.hh:292
unsigned int GetChannelCount() const
returns the number of Color channels, e.g.
Definition: ImageBase.hh:362
unsigned int GetHeight() const
Definition: ImageBase.hh:299
int Decompress(BIAS::Image< unsigned char > &destImg, bool readComment=false)
Start decompression of previously given data (from ReadJPEG() or SetCompressedData()), results will be stored in destination image.
int Init(long size=10485760)
Initialize object with standard values and limit shared memory area to given size (in byte...
void Dump(std::ostream &os=std::cout)
dumps this to cout, unfinished piece of code
Definition: MetaData.cpp:460