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I m making app in netbeans platform in java using Swing technology for dentist. i want to measure length of line which is drawn by user on image’s of teeth? so, then Doctor can find the length of root canal of teeth.and line can also be not straight, line can be ZigZag.if any one have idea about that then share with me please.
You can use one of the many line detection algorithms to detect the existence of lines and then measure the line in pixels.
You can use an image processing library that already has these algorithms implemented, or you can implement them your self (better use a library though), this question is about image processing libraries and approaches in java.