来自matlab的视频

Question

我在一个文本文件中有一个矩阵3，我想从它生成一个视频。我该怎么做呢？

到目前为止，我已经完成了以下工作:我已经从文本文件中读取数据，并将其存储在一个变量中。从这里，我想生成由矩阵表示的视频。或者有没有一种方法可以把矩阵分成帧，因为我想把视频分成帧，然后再把帧组合起来，把视频拿回来。然后，我会将原始视频与当前视频进行比较

clear all
clc
filename='filename.txt';
delimiterIn=' ';
K=importdata(filename,delimiterIn);

从这里开始，我该如何继续？

Answer 1

您没有提供有关要制作的电影的足够信息。在此page上高亮显示了制作电影的步骤。关键是在循环中调用getframe来生成电影。我正在修改matlab的示例以适应您的工作：

    clear all
    clc
    filename='filename.txt';
    delimiterIn=' ';
    K=importdata(filename,delimiterIn);
    % K =load(filename) may also work
    nFrames = 20;

    % Preallocate movie structure.
    mov(1:nFrames) = struct('cdata', [],...
                    'colormap', []);

    % Create movie.
    plot(K(:,1), K(:,2));  % assumes you are plotting the first two colums 
    axis tight manual
    set(gca,'nextplot','replacechildren');
    for k = 1:nFrames 
       plot(K(:,1), K(:,2));  % assumes you are plotting the first two columns
                              % the data must somehow change inside this loop
       mov(k) = getframe(gcf);
    end

    % Create AVI file.
    movie2avi(mov, 'mydata.avi', 'compression', 'None');

另一个接口是视频写入器接口，它出现在matlab的最新版本中。它解释了here。并且比上述步骤更值得推荐。请按照那里的建议操作。这个页面很容易理解。

    clear all
    clc
    filename='filename.txt';
    delimiterIn=' ';
    K=importdata(filename,delimiterIn);
    % K =load(filename) may also work


    %Prepare the new file.

    writerObj = VideoWriter('movie.avi');
    open(writerObj);
    % Create movie.
    plot(K(:,1), K(:,2));  % assumes you are plotting the first two colums 
    axis tight manual

    set(gca,'nextplot','replacechildren');
    set(gcf,'Renderer','zbuffer'); % optional I think

    for k = 1:nFrames 
       plot(K(:,1), K(:,2));  % assumes you are plotting the first two columns
                              % the data must somehow change inside this loop
       frame = getframe(gcf);
       writeVideo(writerObj,frame);
    end 
   close(writerObj);