Matlab Huffman Encoding in matrix -

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i trying encode matrix have (after calculating frame differences) huffman code having difficulties completing it

the matrix wish encode huffman called "amp"

something found this:

function y = mat2huff(x) %mat2huff huffman encodes matrix. %   y = mat2huff(x) huffman encodes matrix x using symbol %   probabilities in unit-width histogram bins between x's minimum %   , maximum values. encoded data returned structure %   y:  %      y.code   huffman-encoded values of x, stored in %               uint16 vector.  other fields of y contain %               additional decoding information, including: %      y.min    minimum value of x plus 32768 %      y.size   size of x %      y.hist   histogram of x % %   if x logical, uint8, uint16, uint32, int8, int16, or double, %   integer values, can input directly mat2huff. %   minimum value of x must representable int16.   % %   if x double non-integer values---for example, image %   values between 0 , 1---first scale x appropriate %   integer range before call. example, use y = %   mat2huff(255*x) 256 gray level encoding.    % %   note: number of huffman code words round(max(x(:))) - %   round(min(x(:))) + 1.  may need scale input x generate %   codes of reasonable length.  maximum row or column dimension %   of x 65535.  % %   see huff2mat.  %   copyright 2002-2004 r. c. gonzalez, r. e. woods, & s. l. eddins %   digital image processing using matlab, prentice-hall, 2004 %   $revision: 1.5 $  $date: 2003/11/21 15:21:12 $  if ndims(x) ~= 2 | ~isreal(x) | (~isnumeric(x) & ~islogical(x))    error('x must 2-d real numeric or logical matrix.'); end  % store size of input x. y.size = uint32(size(x));  % find range of x values , store minimum value biased % +32768 uint16. x = round(double(x)); xmin = min(x(:)); xmax = max(x(:)); pmin = double(int16(xmin)); pmin = uint16(pmin + 32768);    y.min = pmin;  % compute input histogram between xmin , xmax unit % width bins, scale uint16, , store. x = x(:)'; h = histc(x, xmin:xmax); if max(h) > 65535     h = 65535 * h / max(h); end h = uint16(h);   y.hist = h;  % code input matrix , store result. map = huffman(double(h));          % make huffman code map hx = map(x(:) - xmin + 1);         % map image hx = char(hx)';                    % convert char array hx = hx(:)'; hx(hx == ' ') = [];                % remove blanks ysize = ceil(length(hx) / 16);     % compute encoded size hx16 = repmat('0', 1, ysize * 16); % pre-allocate modulo-16 vector hx16(1:length(hx)) = hx;           % make hx modulo-16 in length hx16 = reshape(hx16, 16, ysize);   % reshape 16-character words hx16 = hx16' - '0';                % convert binary string decimal twos = pow2(15:-1:0); y.code = uint16(sum(hx16 .* twos(ones(ysize, 1), :), 2))';   ...

but in above code how declare use matrix called "amp"?

thanks in advance

just call function huf_amp = mat2huf(amp); huf_amp being structure detailed in code sample.


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