Matlab error: “filpath” is not recognized as an internal or external command, operable program or batch file

i am using sift library in my image processing project on matlab R2013a in 32 bit windows 7, i am setting file path as sift_path = fullfile('lib','sift','bin','siftfeat'); and it gives an error as 'lib\sift\bin\siftfeat' is not recognized as an internal or external command, operable program or batch file.

[Sravya Bolla]

I am facing the same problem please someone clarify it....

[Geoff Hayes]

Please copy and paste the full error message (to this question) and show the code that you are evaluating that leads to this error.

[Nimit Kaura]

% MATCH_FEATURES: Match SIFT features in a single image using our multiple
%                 match strategy.
% 
% INPUTS:
%   filename        - image filename (if features have to be computed) or
%                     descriptors filename in the other case
%   filesift        - [opt] file containing sift descriptors
%
% OUTPUTS:
%   num             - number of matches
%   p1,p2           - coordinates of pair of matches
%   tp              - computational time    
%
% EXAMPLES:
%   e.g. extract features and matches from a '.jpg' image:
%   [num p1 p2 tp] = match_features('examples/tampered1.jpg')
%
%   e.g. import features and matches from a '.sift' descriptors file:
%   [num p1 p2 tp] = match_features('examples/tampered2.sift',0)                      
% 
% ---
% Authors: I. Amerini, L. Ballan, L. Del Tongo, G. Serra
% Media Integration and Communication Center
% University of Florence
% May 7, 2012

function [num, p1, p2, tp] = match_features(filename, filesift)

% thresholds used for g2NN test
dr2 = 0.5;

extract_feat = 1; % by default extract SIFT features using Hess' code

if(exist('filesift','var') && ~strcmp(filesift,'nofile'))
    extract_feat = 0; 
end

tic; % to calculate proc time

if extract_feat
    sift_bin = fullfile('lib','sift','bin','siftfeat');   % e.g. 'lib/sift/bin/siftfeat' in linux
    [pf,nf,ef] = fileparts(filename);
    desc_file = [fullfile(pf,nf) '.txt'];

      im1=imread(filename);
      if (size(im1,1)<=1000 && size(im1,2)<=1000)
          status1 = system([sift_bin ' -x -o ' desc_file ' ' filename]);
      else
          status1 = system([sift_bin ' -d -x -o ' desc_file ' ' filename]);
      end

      if status1 ~=0 
          error('error calling executables');
      end

      % import sift descriptors
      [num, locs, descs] = import_sift(desc_file);
      system(['rm ' desc_file]);
  else
      % import sift descriptors
      [num, locs, descs] = import_sift(filesift);
  end

if (num==0)
    p1=[];
    p2=[];
    tp=[];
else
    p1=[];
    p2=[];
    num=0;

      % load data
      loc1 = locs(:,1:2);
      %scale1 = locs(:,3);
      %ori1 = locs(:,4);
      des1 = descs;

      % descriptor are normalized with norm-2
      if (size(des1,1)<15000)
          des1 = des1./repmat(sqrt(diag(des1*des1')),1,size(des1,2));
      else
          des1_norm = des1; 
          for j= 1 : size(des1,2)
              des1_j = des1_norm(j,:);
              des1_norm(j,:) = des1_j/norm(des1_j,2); 
          end
          des1 = des1_norm;
      end

      % sift matching
      des2t = des1';   % precompute matrix transpose
      if size(des1,1) > 1 % start the matching procedure iff there are at least 2 points
          for i = 1 : size(des1,1)
              dotprods = des1(i,:) * des2t;        % Computes vector of dot products
              [vals,indx] = sort(acos(dotprods));  % Take inverse cosine and sort results

              j=2;
              while vals(j)<dr2* vals(j+1) 
                  j=j+1;
              end
              for k = 2 : j-1
                  match(i) = indx(k); 
                  if pdist([loc1(i,1) loc1(i,2); loc1(match(i),1) loc1(match(i),2)]) >10  
                      p1 = [p1 [loc1(i,2); loc1(i,1); 1]];
                      p2 = [p2 [loc1(match(i),2); loc1(match(i),1); 1]];
                      num=num+1;
                  end
              end
          end
      end

      tp = toc; % processing time (features + matching)

      if size(p1,1)==0
          fprintf('Found %d matches.\n', num);
      else
          p=[p1(1:2,:)' p2(1:2,:)'];
          p=unique(p,'rows');
          p1=[p(:,1:2)'; ones(1,size(p,1))];
          p2=[p(:,3:4)'; ones(1,size(p,1))];
          num=size(p1,2);
          fprintf('Found %d matches.\n', num);
      end

end

[Stephen23]

@Nimit Kaura: you have been asked to provide the full error message in your question. Please provide the full error message in the question. This means all of the red text.

[Jan]

@Nimit Kaura: Do you see that the code is not readable? Please use the "{} Code" button. It would be easier, if you post the relevant part of the code only.

Answer 1

[Jan]

The error message is clear: 'lib\sift\bin\siftfeat' is not recognized as an external function. Most likely this file is not existing at all, because the path is relative. Check this:

sift_bin = fullfile('lib','sift','bin','siftfeat');
test     = fullfile(cd, sift_bin);
exist(test, 'file')

Perhaps you want to use an absolute path. Where do you expect the executable "siftfeat.exe" to be?

While the OP worked under Windows, the attached comments from Nimit Kaura do not mention the used operating system.