Question
Suppose I want to recognise a particular face I am extracting sift points from it and feeding it as a input vector . Then what should be the output ? I am talking during the training phase . How are outputs decided for a particular type of input pattern?
Expert Answer
Prashant Kumar
PhD Expert
Answered Aug 25, 2026
% For c classification categories numbered 1:c, use a classindex row vector
classind = [ 5 3 1 4 2 5 4 3 2 1 ] N = length(classind)
% The corresponding target matrix is obtained using the ind2vec command
target = full(ind2vec(classind))
% The corresponding output will be a matrix of the same size
outind = vec2ind(output) err = outind ~= classind Nerr = sum(err) PctErr = 100*Nerr/N
%Obviously, more is needed to obtain error rates for individual classes.
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