How could i make my frame difference method as real time ?

[tina]

Hi , I am calculating time of my processing . my code : http://codepad.org/BSirion5 I grabbed only two frames that diff = f1 -f2 at first loop iteration ,. When i run code. i checked program processing time which some thing like this Initailze camera mood.... detection time = 226.576 ms detection time = 233.211 ms detection time = 281.371 ms detection time = 273.171 ms detection time = 227.692 ms detection time = 229.399 ms detection time = 262.038 ms detection time = 242.937 ms detection time = 208.642 ms detection time = 270.872 ms detection time = 287.31 ms detection time = 212.902 ms detection time = 265.157 ms detection time = 265.785 ms detection time = 252.408 ms detection time = 238.049 ms detection time = 265.009 ms detection time = 281.793 ms detection time = 257.836 ms detection time = 218.414 ms detection time = 261.425 ms detection time = 268.683 ms detection time = 238.207 ms detection time = 222.844 ms detection time = 261.017 ms detection time = 220.808 ms detection time = 225.111 ms detection time = 263.729 ms detection time = 252.442 ms detection time = 211.466 ms detection time = 276.157 ms detection time = 290.334 ms detection time = 226.761 ms detection time = 289.755 ms detection time = 264.321 ms detection time = 270.401 ms detection time = 211.406 ms detection time = 264.604 ms detection time = 253.199 ms detection time = 220.085 ms detection time = 221.343 ms detection time = 254.793 ms detection time = 232.024 ms detection time = 217.092 ms detection time = 260.867 ms detection time = 230.145 ms detection time = 225.672 ms detection time = 265.954 ms detection time = 283.63 ms detection time = 245.943 ms detection time = 232.605 ms detection time = 268.429 ms detection time = 211.795 ms detection time = 234.027 ms detection time = 262.869 ms detection time = 233.799 ms detection time = 239 ms detection time = 261.682 ms detection time = 260.83 ms detection time = 219.194 ms detection time = 266.752 ms detection time = 249.426 ms detection time = 265.998 ms detection time = 233.632 ms detection time = 251.878 ms detection time = 257.261 ms detection time = 219.452 ms detection time = 256.234 ms detection time = 264.546 ms detection time = 289.183 ms detection time = 215.055 ms detection time = 267.02 ms detection time = 253.985 ms detection time = 226.334 ms detection time = 220.25 ms detection time = 255.339 ms detection time = 214.689 ms detection time = 242.647 ms detection time = 258.114 ms detection time = 239.591 ms detection time = 248.238 ms detection time = 245.402 ms detection time = 266.547 ms detection time = 220.903 ms detection time = 248.863 ms detection time = 254.537 ms detection time = 211.379 ms detection time = 233.58 ms detection time = 268.39 ms detection time = 218.566 ms detection time = 220.327 ms detection time = 261.507 ms detection time = 238.651 ms detection time = 237.025 ms detection time = 258.865 ms detection time = 267.539 ms detection time = 209.787 ms detection time = 260.823 ms detection time = 267.556 ms detection time = 216.067 ms detection time = 238.266 ms detection time = 267.508 ms detection time = 276.625 ms detection time = 227.174 ms detection time = 262.231 ms detection time = 271.494 ms detection time = 257.582 ms detection time = 211.41 ms detection time = 264.637 ms detection time = 228.064 ms detection time = 223.122 ms detection time = 262.731 ms that mean time is taking too much only for frame rate 4 .. How could is that possible while my camera diver have set frame rate 30fps . Is it due to my grabbed frames that is only 2 . and may be thats depend on loop iterations. AS i understand . i think the time like 211.379 ms worked for two frames at only two iteration,. thats my time tells frame rate 4fps .. Is that mean i should grab 15 frames like diff = f 1 - f2 diff = diff - f3 diff = diff - f4 ' diff = diff - f5 soooooooo on diff = diff - f15 Processing generally looks real time processing > 15 or 12 frame per sec .. What do i do ? Is that the reason that frame difference method is not good . Is frame difference only applied between two frames . ? My program is not real time because it leaves previous frame shadow during my hand motion ,. Can you please guide me in frame difference to make it real time . thanks