1. Circle Detection Compression and Security of Surveillance Videos 張晏豪

2. Experimental Setting Windows XP Intel(R) Core(TM)2 Quad CPU Q6600 @2.40GHz 2GB RAM 2

3. Threshold_dis: If the distance from the point to the circle is within Threshold_dis, this point is located on the circle Edge points/2 π r: This is a percentage about how many points on the circle to decide a true circle 3

4. Experimental Results Violence method Threshold_dis =1 Edge points/2 π r=0.9 Elapsed time=19492.8 sec 4

5. 5

6. END 6