在每个实例由单独的程序创建文件后，使用MATLAB实时处理文件 [英] Using MATLAB to process files in real-time after every instance a file is created by a separate program

问题描述

我正在使用MATLAB处理由相机创建并存储在Windows目录中的图像文件.我正在尝试将反馈合并到相机的控制中，因此，每次创建新图像并出现在目录中时，都要求MATLAB处理图像.我从未创建过可连续运行并等待事件发生的MATLAB程序.

I am using MATLAB to process image files that are created by a camera and stored in a directory on Windows. I am trying to incorporate feedback into control of the camera and therefore require MATLAB to process an image every time a new image is created and appears in the directory. I have never created a MATLAB program that runs continuously and waits for an event to occur.

从我在网上阅读的内容来看，最好的选择似乎是使用计时器对象，并让MATLAB程序重复读取目录的内容.这是一个好的方法还是我可以实现的替代方法?

我想知道是否有一种方法可以通过目录中文件的出现来触发" MATLAB程序，而不是不断调查该目录的内容.我希望是因为目录填满后，我发现MATLAB中的"dir"命令确实很慢；速度太慢，可能无法以所需的速度处理图像.

I'm wondering if there is a way the MATLAB program can be "triggered" by the appearance of a file in a directory as opposed to constantly surveying the contents of this directory. I hope there is because as the directory fills up I find that the "dir" command in MATLAB is really slow; slow enough that I may not be able to process images as fast as I require.

作为后续.关于如何部署此程序，有什么建议吗?我喜欢的一个想法是带有开始"和停止"按钮的简单GUI.

As a follow up. Are there any recommendations about how to deploy this program? An idea I like is a simple GUI with a "start" and "stop" button.

谢谢.

推荐答案

您可以执行以下操作:

创建计时器对象，该对象将每10秒检查一次您的目录:

Create timer object, which will check your directory every 10 seconds:

t = timer('TimerFcn', @mycallback, 'Period', 10.0, 'ExecutionMode', 'fixedSpacing');

您的'mycallback'函数应如下所示:

DIR_TO_READ = 'C:\incoming-files';
DIR_TO_MOVE_PROCESSED = 'C:\processed-files';

% get list of files.
file_struct = dir(DIR_TO_READ)
% remove '.' and '..' directories
file_struct([file_struct.isdir]) = [];
for j = 1 : numel(file_struct)
    current_file = file_struct(j).name;
    full_filename = fullfile(DIR_TO_READ, current_file)

    % add your processing of the file here
    % e.g.
    bla = imread(full_filename);

    % now move the processed file to the processed file folder
    movefile(full_filename, fullfile(DIR_TO_MOVE_PROCESSED, current_file))

end       

现在您需要启动计时器对象

Now you need to start the timer object

start(t);

您可以使用以下方式停止计时器对象

You can stop the timer object with

stop(t);

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