You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: imLengthEstimate.m
    path of file: ./repos/matImage/matImage/imMinkowski
    
    the code of the file until where you have to start completion: function [len, labels] = imLengthEstimate(img, varargin)
% Estimate total length  of a binary 1D structure using edge correction.

    
function [len, labels] = imLengthEstimate(img, varargin)
% Estimate total length  of a binary 1D structure using edge correction.
%
%   LEN = imLengthEstimate(IMG);
%   When IMG is a binary image, returns the total length of the structure,
%   equal to the number of pixels.
%   This function is intend