Computer Graphics & Interactive Techniques Lab
Computer Graphics & Interactive Techniques Lab
Computer Graphics & Interactive Techniques Lab
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Temporally Maximum Occurrenceframe (TMOF)<strong>Computer</strong> <strong>Graphics</strong> & <strong>Interactive</strong> <strong>Techniques</strong> <strong>Lab</strong>7
Temporally MaximumOccurrence frame (TMOF)<strong>Computer</strong> <strong>Graphics</strong> & <strong>Interactive</strong> <strong>Techniques</strong> <strong>Lab</strong>8
<strong>Computer</strong> <strong>Graphics</strong> & <strong>Interactive</strong> <strong>Techniques</strong> <strong>Lab</strong>9
<strong>Computer</strong> <strong>Graphics</strong> & <strong>Interactive</strong> <strong>Techniques</strong> <strong>Lab</strong>10
Computational complexityanalysisAlpha-trimmed average histogram• Histogram construction = O(N‧W‧H)• Sorting for each bins = O’(N h Nlog 2 N)• Averaging = O” ((1-2α)NN h )Total=O(N‧W‧H)+ O’(N h Nlog 2 N)+ O”((1-2α)NN h )<strong>Computer</strong> <strong>Graphics</strong> & <strong>Interactive</strong> <strong>Techniques</strong> <strong>Lab</strong>11
Computational complexityTMOFanalysis• Down-scaling =O”(W‧H ‧N h )• Each pixel position =O(N h ‧N)• Maximun count in the order of=O’(N h ‧B)Total = O”(W‧H ‧N h )+O(N h ‧N)+O’(N h ‧B)Alpha-trimmed average histogram=1.094TMOF=1.012<strong>Computer</strong> <strong>Graphics</strong> & <strong>Interactive</strong> <strong>Techniques</strong> <strong>Lab</strong>12
Experimental results<strong>Computer</strong> <strong>Graphics</strong> & <strong>Interactive</strong> <strong>Techniques</strong> <strong>Lab</strong>13
<strong>Computer</strong> <strong>Graphics</strong> & <strong>Interactive</strong> <strong>Techniques</strong> <strong>Lab</strong>14
<strong>Computer</strong> <strong>Graphics</strong> & <strong>Interactive</strong> <strong>Techniques</strong> <strong>Lab</strong>15
<strong>Computer</strong> <strong>Graphics</strong> & <strong>Interactive</strong> <strong>Techniques</strong> <strong>Lab</strong>16
<strong>Computer</strong> <strong>Graphics</strong> & <strong>Interactive</strong> <strong>Techniques</strong> <strong>Lab</strong>17
<strong>Computer</strong> <strong>Graphics</strong> & <strong>Interactive</strong> <strong>Techniques</strong> <strong>Lab</strong>18
ConclusionOur proposed schemes are compared with thefamily of alpha-trimmed average histograms,which is a video segment descriptor in MPEG-7.Experimental results show that both the k-TMOFand k-pTMOF can achieve the best performancewhen k=3,and this scheme outperforms the alphatrimmedaverage histogram representation forvideo retrieval.<strong>Computer</strong> <strong>Graphics</strong> & <strong>Interactive</strong> <strong>Techniques</strong> <strong>Lab</strong>19
Thanks !報 告 結 束 ~<strong>Computer</strong> <strong>Graphics</strong> & <strong>Interactive</strong> <strong>Techniques</strong> <strong>Lab</strong>20
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