Length Estimation from the Past to the Future: A Brief Review

Abstract

The quantification of linear biological objects is crucial in many biological studies. A number of different methods have been used in the past for the length and length density estimation of linear features. Due to the progression of science and technology, some of these methods have been replaced by computerised analysis methods. The objective of this article is to describe briefly the length estimation methods used in the past and to review them as a basis for future developments in this area.