how to write matlab porgramme to remove one of the RGB channels (make 0) in each of the 10 frames in a sequence?

how to write matlab programme to remove one of the RGB channels in each of the 10 frames in a sequence

Answer 1

[Walter Roberson]

frame_to_remove = randi(3);

initialize
for framenum = 1 : 10
  advance to frame given by framenum, storing in variable thisframe
  thisframe(:,:,frame_to_remove) = 0;
  image(thisframe);
  drawnow();
end

[suresh gunarathna]

why do get 3 for randi ? it can be any value?

[Walter Roberson]

>> randi(3)
ans =
     1
>> randi(3)
ans =
     3
>> randi(3)
ans =
     2
>> randi(3)
ans =
     1
>> randi(3)
ans =
     1
>> randi(3)
ans =
     2

[Walter Roberson]

I should probably have named frame_to_remove as plane_to_remove

[Walter Roberson]

initialize input here
for framenum = 1 : 10
   read in frame given by framenum, storing in variable to hold all frames
end
finish with input movie here

initialize output movie here
for channel_to_remove = 1 : 3
  for framenum = 1 : 10
    pull out frame given by framenum from variable that stores all frames, storing this frame in variable thisframe
    thisframe(:,:,channel_to_remove) = 0;
    add thisframe to output movie
  end
end
finish with output movie here

[suresh gunarathna]

can we write function for this

[Walter Roberson]

Sure, go ahead.

Answer 2

[suresh gunarathna]

out put is black image nothing else

[Walter Roberson]

Notice in my code outline, I said to store the frame in variable thisframe, and then I proceeded to modify thisframe .

In your actual code, you probably created a new variable instead of modifying the old one, and you probably did not pay attention to the data type of the variable.

We would need to see your code to be sure.

[suresh gunarathna]

actually i want create m-file for my mp4 vedio . i frogot something tell you that question have hint it is first 10 frame red channel 0 ,second 10 frames green channel 0 and so on.

[Walter Roberson]

You will need to say more clearly what the question is then. Is the question to figure out which of the three channels is non-zero ?

Answer 3

[suresh gunarathna]

question is this , a vedio file (sample.mp4) is given to you, write a matlab program (M-file) to remove one of the RGB channels (make 0) in each of the 10 frames in a sequence . (Hint - first 10 frames red channel 0 , second 10 frames green channel 0 and so on.)

[Walter Roberson]

Required output is not stated. Is the required output a new movie that is 3 times as long as the original movie, with the first 10 frames being the original with red removed, the second 10 being the original frames with green removed, the third 10 being the original frames with blue removed? Or is the desired output a 3 x 10 series of subplots displaying the images? Or a 3 x 10 montage?

[suresh gunarathna]

by using the given vedio , write a resultant vedio