MATLAB: Here is the code i cannot understand the error in it can any one will help me to locate the error

Question

close all;
clear;
%Read Background Image
Backg=imread('blk.jpg');
%Read Current Frame
CurrentFrame=imread('2.jpg');
%Display Background and Foreground
subplot(2,2,1);imshow(Backg);title('BackGround');
subplot(2,2,2);imshow(CurrentFrame);title('Current Frame');
%Convert RGB 2 HSV Color conversion
[Background_hsv]=round(rgb2hsv(Backg));
[CurrentFrame_hsv]=round(rgb2hsv(CurrentFrame));
Out = bitxor(Background_hsv,CurrentFrame_hsv);
%Convert RGB 2 GRAY
Out=rgb2gray(Out);
%Read Rows and Columns of the Image
[rows,columns]=size(Out);
BinaryImage = zeros(:, 'int8');
%Convert to Binary Image
for i=1:rows
  for j=1:columns
    if Out(i,j) >0
      BinaryImage(i,j)=1;
    else
      BinaryImage(i,j)=0;
    end
  end
end
%Apply Median filter to remove Noise
FilteredImage=medfilt2(BinaryImage,[5 5]);
%Boundary Label the Filtered Image
[L ,num]=bwlabel(FilteredImage);
STATS=regionprops(L,'all');
cc=[];
removed=0;
%Remove the noisy regions 
for i=1:num
  dd=STATS(i).Area;
  if (dd < 500)
    L(L==i)=0;
    removed = removed + 1;
    num=num-1;
  else
  end
end
[L2 ,num2]=bwlabel(L);
% Trace region boundaries in a binary image.
[B,L,N,A] = bwboundaries(L2);
%Display results
subplot(2,2,3),  imshow(L2);title('BackGround Detected');
subplot(2,2,4),  imshow(L2);title('Blob Detected');
hold on;
for k=1:length(B),
  if(~sum(A(k,:)))
    boundary = B{k};
    plot(boundary(:,2), boundary(:,1), 'r','LineWidth',2);
    for l=find(A(:,k)),
      boundary = B{l};
      plot(boundary(:,2), boundary(:,1), 'g','LineWidth',2);
    end
  end
end

Answer 1

BinaryImage = zeros(:, 'int8');

is not valid syntax. You want

BinaryImage = zeros(rows, columns, 'int8');

By the way: what is the output of

logical(Out)

?