You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: retriv1.m
    path of file: ./repos/Digital-Image-Watermarking-Using-Optimized-DWT-DCT
    
    the code of the file until where you have to start completion: function [message_vector,Mo,No] = retriv1(watermrkd_img,message)
pn_sequence_search='T';
 
blocksize=8;
midband=[   0,0,0,1,1,1,1,0;    % defines the mid-band frequencies of an 8x8 dct
            0,0,1,1,1,1,0,0;
            0,1,1,1,1,0,0,0;
            1,1,1,1,0,0,0,0;
            1,1,1,0,0,0,0,0;
            1,1,0,0,0,0,0,0;
            1,0,0,0,0,0,0,0;
            0,0,0,0,0,0,0,0 ];

watermarked_image= watermrkd_img;
% determine size of watermarked image
Mw=size(watermarked_image,1);           %Height
Nw=size(watermarked_image,2);           %Width
 
% read in original watermark

orig_watermark=double(message);

    
function [message_vector,Mo,No] = retriv1(watermrkd_img,message)
pn_sequence_search='T';
 
blocksize=8;
midband=[   0,0,0,1,1,1,1,0;    % defines the mid-band frequencies of an 8x8 dct
            0,0,1,1,1,1,0,0;
            0,1,1,1,1,0,0,0;
            1,1,1,1,0,0,0,0;
            1,1,1,0,0,0,0,0;
            1,1,0,0,0,0,0,0;
            1,0,0,0,0,0,0,0;
            0,0,0,0,0,0,0,0 ];

watermarked_image= watermrkd_img;
% determine size of watermarked image
Mw=size(watermarked_image,1);           %Height
Nw=size(watermarked_image,2);           %Width
 
% read in original watermark

orig_watermark=double(message);
 
% determine size of original watermark
Mo=size(orig_watermark,1);  %Height
No=size(orig_watermark,2);  %Width
 
% read in key for PN generator
file_name='_key.bmp';
key=double(imread(file_name))./256;
 
 
 
% reset MATLAB's PN generator to state "key"
j = 1;
for i =1:length(key)
rand('state',key(i,j));
end