matlab vidéo

[invite63fe02f4]

impossible d'executer ce programme :

Merci d'utiliser les différentes balises à ta disposition, dans ce cas cette balise est symbolisée par ceci:

yoda1234.

function [video_mat,color_burst_mat]=video_extract(raw_video) 
 
%********************************************************************** 
%  
% THIS FUNCTION EXTRACT THE ACTIVE VIDEO AND THE COLOR BURST INFORMATION  
% FROM A BINARY FILE OF 27MHZ SAMPLED VIDEO. 
% 
% INPUT - RAW VIDEO BINARY FILE 
%          
% OUTPUT - 3D MATRIX OF ACTIVE VIDEO. EACH 2D MATRIX IS ONE FIELD 
%        EACH RAW IS ONE VIDEO LINE 
%          THE COLOR BURST MAT CONTAINS THE FREQUENCY AND PHASE IN EACH  
%          VIDEO LINE 
%********************************************************************** 
 
% SAMPLING RATE IS 27MHZ MEANING 37ns PERIOD. 
[m,n]=size(raw_video); 
sync_threshold=800;     %threshold for sync detection 
vsync_period_threshold=700; 
hsync_period_threshold=100; 
 
% First vertical sync detection 
 
vsync_flag=0; 
hsync_flag=0; 
vsync_progress=0; 
vsync_counter=0; 
hsync_counter=0; 
  
for i=1:m 
   if raw_video(i) < sync_threshold 
      vsync_counter=vsync_counter+1; 
      if vsync_counter > vsync_period_threshold 
         vsync_flag=1; 
      end 
   else 
      if vsync_flag==1 
         vsync_progress=vsync_progress+1; 
         vsync_flag=0; 
         vsync_counter=0; 
         if vsync_progress == 6 
            end_of_1st_vsync=i 
            vsync_progress=0; 
            break; 
         end 
      end 
   end 
end 
 % From end of VSYNC, detect every HSYNC and store active video field  
% from video lines 10-262 for field0 and 272-525 for field1 
 
% End of VSYNC is at the end of line 6 
% Lines 7,8,9 has equalizing pulses and HSYNC pulse every half line period 
 
active_pxl_per_line= 1440; 
line_number=0;              
field_number=1; 
hsync_low2active_video=round(9.2/0.037);      %active video is 9.2us from falling 
edge of HSYNC 
hsync_low2color_burst=round(5.3/0.037);     %color burst starts 5.3us from 
falling edge of HSYNC 
color_burst_length=round(10*(1/3.579545e6)/37e-9);%color burst length is 9+-1 
cycles of 3.579545MHZ 
 
i=end_of_1st_vsync; 
while i<=m 
   if raw_video(i) < sync_threshold 
      hsync_counter=hsync_counter+1; 
      vsync_counter=vsync_counter+1; 
      if vsync_counter > vsync_period_threshold 
         vsync_flag=1; 
      end 
      if  (hsync_counter > hsync_period_threshold & hsync_counter < 
vsync_period_threshold) 
         hsync_flag=1; 
      else 
         hsync_flag=0; 
      end 
   else 
      % HSYNC case 
      if hsync_flag == 1 
line_number=line_number+1; 
         start_of_active_vid=i-hsync_counter+hsync_low2active_video; 
         video_mat(line_number,:,field_number)=... 
            raw_video(start_of_active_vid:start_of_active_vid+active_pxl_per_line-
1); 
          
         %Extracting the line color burst frequency 
         start_of_color_burst=i-hsync_counter+hsync_low2color_burst; 
         
color_burst=raw_video(start_of_color_burst:start_of_color_burst+color_burst_length)
; 
         cb_interp=interp(color_burst,100)-color_burst(1); 
         cb_sign=sign(cb_interp)+1; 
         cb_zero_cross=diff(cb_sign); 
         [zero_index,s]=find(cb_zero_cross>0); 
         color_burst_mat(line_number,1,field_number)=1/(mean(diff(zero_index(4:end-
4)))*37e-11); 
         %color burst phase 1=0 degrees -1=180 degrees 
         color_burst_mat(line_number,2,field_number)=cb_sign(700)/2;  
          
         %reseting counters and progress i to the next line 
         i=start_of_active_vid+active_pxl_per_line-1; 
         vsync_counter=0; 
         hsync_counter=0; 
         hsync_flag=0; % VSYNC case        
      elseif vsync_flag==1 
         vsync_progress=vsync_progress+1; 
         vsync_flag=0; 
         vsync_counter=0; 
         hsync_flag=0; 
         hsync_counter=0; 
         if vsync_progress == 6 
            line_number=0; 
            field_number=field_number+1 
            vsync_progress=0; 
         end 
      % Equalizing pulses case 
      else 
         vsync_counter=0; 
         hsync_counter=0; 
      end 
   end 
   i=i+1; 
end

aidez moi svp
-----

[yoda1234]

Rappel de la charte que tu as acceptée en t'inscrivant ici:

La courtoisie est de rigueur sur ce forum : pour une demande de renseignements bonjour et merci devraient être des automatismes.

Merci d"en tenir compte à l'avenir

[pat7111]

aidez moi svp

Sans un exemplaire de la variable raw_video, argument de la fonction, il me parait difficile de faire quoi que ce soit, a part peut-etre chercher une erreur de syntaxe mais la longueur est peu engageante...