I can't use function jpeg2im

when i type i.e. >> f1=jpeg2im(c1);

 i face these errors

??? Attempt to execute SCRIPT unravel as a function: C:\Program Files\MATLAB\R2010b\bin\unravel.m

Error in ==> huff2mat at 61 x = unravel(y.code', link, m * n); % Decode using C 'unravel'

Error in ==> jpeg2im at 42 x = huff2mat(y.huffman); % Huffman decode.

and unravel.m has not any code.

%UNRAVEL Decodes a variable-length bit stream. % X = UNRAVEL(Y, LINK, XLEN) decodes UINT16 input vector Y based on % transition and output table LINK. The elements of Y are % considered to be a contiguous stream of encoded bits--i.e., the % MSB of one element follows the LSB of the previous element. Input % XLEN is the number code words in Y, and thus the size of output % vector X (class DOUBLE). Input LINK is a transition and output % table (that drives a series of binary searches): % % 1. LINK(0) is the entry point for decoding, i.e., state n = 0. % 2. If LINK(n) < 0, the decoded output is LINK(n); set n = 0. % 3. If LINK(n) > 0, get the next encoded bit and transition to % state [LINK(n) - 1] if the bit is 0, else LINK(n).

% Copyright 2002-2009 R. C. Gonzalez, R. E. Woods, and S. L. Eddins % From the book Digital Image Processing Using MATLAB, 2nd ed., % Gatesmark Publishing, 2009. % % Book web site: http://www.imageprocessingplace.com % Publisher web site: http://www.gatesmark.com/DIPUM2e.htm

[vivek kumar]

facing the same issue please help

[Divyashree]

function x = jpeg2im(y)
narginchk(1,1);

m = [16 11 10 16 24 40 51 61;
    12 12 14 19 26 58 60 55;
    14 13 16 24 40 57 69 56;
    14 17 22 29 51 87 80 62;
    18 22 37 56 68 109 103 77;
    24 35 55 64 81 104 113 92;
    49 64 78 87 103 121 120 101;
    72 92 95 98 112 100 103 99];
order =  [1 9 2 3 10 17 25 18 11 4 5 12 19 26 33 ...
      41 34 27 20 13 6 7 14 21 28  35 42 49 57 50 ...
      43 36 29 22 15 8 16 23 30 37 44 51 58 59 52 ...
      45 38 31 24 32 39 46 53 60 61 54 47 40 48 55 ...
      62 63 56 64];
  rev = order;
   for k = 1:length(order)
       rev(k) = find(order == k);
   end
   m = double(y.quality)/100 * m;
   xb = double(y.numblocks);
   sz = double(y.size);
   xn = sz(2);
   xm = sz(1);
   x = huff2mat(y.huffman);
   eob = max(x(:));
   
   z = zeros(64, xb);  k=1;
   for j = 1:xb
       for i = 1:64
           if x(k) == eob
                k = k+1; break;
           else
               z(i, j) = x(k);
               k = k +1;
           end
       end
   end
   z = z(rev, :);
   x = col2im(z, [8 8], [xm xn],'distinct');
   blockSize = [8 8];
x = blockproc(x, blockSize, @(x) x .* p1, m);

   t = dctmtx(8);
   x = blockproc(x, [8 8], 'p1 * x * p2', t', t);
   x = uint8(x + 128);
   
% EDIT: COPYRIGHT code deleted.

i am getting this error

Error using blockproc>parse_inputs (line 1026)

Named parameters must have a corresponding value.

Error in blockproc (line 226)

[source,fun,options] = parse_inputs(source,block_size,fun,args{:});

Error in jpeg2im (line 43)

x = blockproc(x, blockSize, @(x) x .* p1, m);

please help me

[Stephen23]

@Divyashree: I do not see any syntax in the BLOCKPROC dodocumentation that matches how you are calling it. After the 3rd input (the function handle) the documentation states that you can provide name-value pairs. But instead of following what the documentation describes, you have provided a single numeric input:

x = blockproc(x, blockSize, @(x) x .* p1, m);
%                                         ^ what do you expect this to do?

The function handle is not written to accept a BLOCK STRUCT as the documenation explains:

https://www.mathworks.com/help/images/ref/blockproc.html#br_lkwm-1

P1 is not defined anywhere.

The syntax of the next BLOCKPROC call does not follow the documentation either.

[Divyashree]

Thank you so much I got the output. Can you give me refrence text book name for video compression using matlab like Digital image processing using matlab (Gonzalez). So it will be useful for my research work.

Answer 1

[xi jiang]

[Liang Qiaoyi]

请问这个问题是怎么解决的，可以具体说说吗？