Impala Documentation

Mpeg7Doc* Impala::Core::VideoSet::ShotSegmenter::ConstructMpeg7Doc	(	CString	id,
		CString	fileName,
		int	realId,
		int	nrOfFrames,
		int	frameRateNum,
		int	frameRateDen
	)			const `[inline, protected]`

Definition at line 130 of file ShotSegmenter.h.

References Impala::Core::VideoSet::Mpeg7Doc::AddShot(), Impala::MakeString(), mDoNrkf, mPredictions, mProbThresh, and Impala::Core::Array::Array2dTem< StorT, elemSize, ArithT >::Value().

Referenced by WriteMp7ShotSeg().

00132     {
00133         int fractions = 0;
00134         Mpeg7Doc* mp7 = new Mpeg7Doc(id, fileName, nrOfFrames, fractions, true, 
00135                                      "", "", frameRateNum, frameRateDen);
00136 
00137         int firstFrameInShot = 0;
00138         int frameAtSemiCut = -1;
00139         int lastFrame = nrOfFrames - 1;
00140         int shotNr = 0;
00141 
00142         for (int i = 0; i <= lastFrame; i++)
00143         {
00144             // If the probability is >mProbThresh then there was a cut 
00145             // between previous and current frame
00146             if ((mPredictions->Value(i, 0) > mProbThresh) ||
00147                 (i == lastFrame))
00148             {
00149                 String shotName = "shot" + MakeString(realId + 1) + "_"
00150                     + MakeString(shotNr + 1);
00151                 std::vector<String> keyNames;
00152                 keyNames.push_back(shotName + "_RKF");
00153                 if (frameAtSemiCut != -1)
00154                     keyNames.push_back(shotName + "_NRKF");
00155                 std::vector<int> keyFrames;
00156                 if (frameAtSemiCut == -1)
00157                 {
00158                     keyFrames.push_back((firstFrameInShot + i) / 2);
00159                 }
00160                 else
00161                 {
00162                     keyFrames.push_back((firstFrameInShot + frameAtSemiCut) / 2);
00163                     keyFrames.push_back((frameAtSemiCut + i) / 2);
00164                 }
00165                 mp7->AddShot(shotName, firstFrameInShot, i, keyNames, keyFrames);
00166                 firstFrameInShot = i + 1;
00167                 frameAtSemiCut = -1;
00168                 shotNr++;
00169             }
00170             else if (mDoNrkf &&
00171                      (mPredictions->Value(i, 0) > 0.8 * mProbThresh) &&
00172                      (i - firstFrameInShot > 25))
00173             {
00174                 frameAtSemiCut = i;
00175             }
00176         }
00177         return mp7;
00178     }

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