how can i correct this code to write a video

I've this code and i dont know how to write a video with images result:

clear all;
close all;
clc;
foregroundDetector = vision.ForegroundDetector('NumGaussians', 3, ...
    'NumTrainingFrames', 300,'MinimumBackgroundRatio', 0.6);
videoReader = vision.VideoFileReader('video6.avi',...
    'VideoOutputDataType','uint8');
JJ=0;
j=0;
k=0;
m=0;
J=0;
for J=1:250
    J=J+1
    frameRGB = step(videoReader); % read the next video frame
    foreground1 = step(foregroundDetector, frameRGB);
L = bwlabel(foreground);
s = regionprops(L, 'Area');
%s(1)
area_values = [s.Area];
idx3 = find((1700 <= area_values) & (area_values <= 1900000));
ForF = ismember(L, idx3);
blobAnalysis = vision.BlobAnalysis('BoundingBoxOutputPort', true, ...
    'AreaOutputPort', false, 'CentroidOutputPort', false, ...
    'MinimumBlobArea', 1700,'MaximumCount',2);
bbox = step(blobAnalysis, ForF);
numperso = size(bbox,1);
    %if J>=90 && J<99
if numperso>0
for i=1: numperso
      blobVariance(i) = var(double(bbox(i,:)));
      [minimumE2,IE2] = max(blobVariance);
      result = insertShape(frame, 'Rectangle', bbox(IE2,:), 'Color', 'red');
      result = insertText(result, [10 10], numperso, 'BoxOpacity', 1, ...
          'FontSize', 14);
      blobVariance(i)=[];
      figure(J); imshow(result); title('Detected person');
      v = VideoWriter('video.avi');
      open(v);
      writeVideo(v,figure(J))
    end
  end
   close(v);
   end

can anyone please tell why the video result contains only one frame please

Answer 1

[Image Analyst]

What is "numperso"? Is it 1? That would explain it.

[bay rem]

it's number of blobs in the images ,it can be 1 2...

[Image Analyst]

Since you open a new video for each frame and you write out the same number of frames as people, you will have a whole bunch of movies with only 1 or 2 frames. But like Walter pointed out, you're using the same name for each video so you're just overwriting the previous video at each frame and you end up with just one video, not lots of them. Not sure what you want to do so we're not sure how to recommend fixing it.

[bay rem]

thank you soo much ,it's working now :)

Answer 2

[Walter Roberson]

Do not create and open the videowriter object inside the loop: when you do that, you are overwriting the file over and over again.

[bay rem]

THANK You soooo much , its working now :)