Math Is Fun Forum

Fouier Descriptor representation has an great advantage . It reduce a 2D to 1D problem ./ How ?  what does that mean actually ?

Does it mean Fourier Descriptor ( that are actually  defined by complex numbers ) define 1D function ?

smaller the fourier co-efficient : lose of details and global  shape of boundary  of an object .
higher the Fourier co-efficient : more details and high frequency  components .

these descriptor retain the principal shape feature of the original boundary .  How can last figure( see image in below link )  retain the original shape although the number of Fourier co-efficient  are less  say M < N where N = total boundary  points . ?

Note
Attached Image Link : http://imageshack.us/photo/my-images/85/44022547.png/   

Thanks

speed should be calculate in integer or double or float ? ??
Please tell me with reason thanks

Hi ,

I get the time of each line of code of my program .

Program :

cout<<" timeBeginPeriod : " << timeBeginPeriod(1) <<endl; //Add Winmm.lib in Project
    cout<<" start Time : " << ( (double)GetTickCount() )/1000<<endl;
    cout<<" Hi "<< ( (double)GetTickCount() )/1000<<endl;
    cout<<" Hi , 123 456 "<< ( (double)GetTickCount() )/1000<<endl;

Note : GetTickCount()  give me number of milisecs . ./

And i get this

timeBeginPeriod : 0
start Time : 137809
Hi 137809
endTimer : 0

Which mean , each line of code taking time  " 137809 " in secs .
My question is What does mean by 137809 . Does it mean its taking that its taking 17 secs  and 809 milisec ?

How does Minimum perimeter polygon(MPP ) Algorithm work?

Can some one please explain me thanks

I  have DAta base that having  three features  average , standard deviation and variance of 10 image which in arrays looks like this

Average   standard Deviation           Variance
63          12192                           110
63         12103                                110
64         12258                                110
73         13331                                115
88         14740                                121
69         12937                                131
79         13824                                117
63         12192                                110
65         12207                                 110

I have to make patterns .. Of these values . Mathematically it seems to me difficult .
but i think i should apply nested loop . and make patterns .
and then test my input image statistic with the patterns that we can get using nested loop . .

Is there a simple way in maths to get patterns of the above values .

Please help me Thanks