HELP THIS PROBLEM ?? how to FIND value of Lenght line on edge image

I NEDD M-FILE CODING ----- PLEASE HELP ME TO SOLVE THIS PROBLEM ?

this link my problem ==========> <http://tinypic.com/view.php?pic=9a9vdu&s=6>

image ceramic before warping :

<http://tinypic.com/view.php?pic=t6ezww&s=6>

<http://tinypic.com/view.php?pic=2j10kg9&s=6> &

image ceramic after croping and warping :

<http://tinypic.com/view.php?pic=2czer0o&s=6>

<http://tinypic.com/view.php?pic=2i74z2t&s=6>

[Ryan]

What length are you looking for?

[Ryan]

Do we get an acknowledgement on your thesis paper?

[KURNIAWAN]

Legth Defect and Lenght Ceramic ??

and we know the lenght of ceramic is 400 x 400 mm ?

if the lenght on pixel its also no proble, i can covert to milimeter with imresize first into EX : J = imresize (J, [2500 2500]);

[KURNIAWAN]

of course you get acknowledgemet,, i write this link and also copy my thesis for you if already finish,, HOW TO solve this problem, please help

[KURNIAWAN]

(Lenght defect (Ld) / Lenght ceramic (400mm)