3

假设我们有以下for循环：

for i=1:100
    % image processing calculation
    % show image to the user and ask for his rating
    rating(i) = input('Enter rating of the shown image\n');
end

显然，该input命令将等待用户输入，并且在for用户提供输入之前循环不会继续。我在for循环中运行的图像处理代码非常耗时，所以我想知道是否有办法让 MATLAB 在等待用户输入的同时继续计算 - 在后台 - 进行以下循环迭代。

4

1 回答 1

3

这是我在评论中提到的想法。

num_im = 3; % Number of images

% Initialize
rating = zeros(num_im,1);
fig = zeros(num_im,1);
txt = zeros(num_im,1);

% Main loop
for i = 1:num_im
    % image processing calculation
    pause(1); % a dummy calculation
    % Open a figure
    fig(i) = figure('Name', ['Image #' num2str(i)],...
        'CloseRequestFcn', [... % read the text edit
        'temp = str2double(get(txt(' num2str(i) '), ''String'')); ',...
        'if isnan(temp), errordlg(''Please enter the rating.''); ',... % Error if invalid
        'else, rating(' num2str(i) ') = temp; delete(fig(' num2str(i) ')); end']);

    subplot(2,1,1, 'position', [0 0.5 1 0.5]);

    % Show your image
    [im, map] = imread('trees.tif');
    imshow(im, map);
    % Text edit
    txt(i) = uicontrol('Units','Normalized',...
        'Style','edit',...
        'Position', [0.3 0.2 0.4 0.2]); 
end

确保在输入评分后单击其他位置，以便text box检测您的输入。

它将所有评分存储在rating矩阵中。

然而，这并不限制打开数字的数量。如果要限制它们，请参阅编辑。

编辑

限制打开的数字的数量。我建议您将计算后的所有图像放入队列中，并设置一个计时器在后台询问用户评分，直到询问所有评分。

主程序

num_im = 4; % Number of images
max_num_figs = 2; % maximum number of open figures

% Initialize
rating = zeros(num_im,1);
fig = zeros(num_im,1);
txt = zeros(num_im,1);
show_idx = 0; % Number of shown images
Calc_idx = 0; % Number of images in Queue
num_open_figs = 0; % number of open figures

Queue = cell(num_im, 1);
% Main loop

% Start a timer for asking the user rating in background
tmr = timer('ExecutionMode', 'fixedRate',...
    'Period', 0.5, 'TimerFcn', 'tmr_callback');
start(tmr);

for k = 1:num_im
    % image processing calculation
    pause(1); % a dummy calculation

    % Put the image and its data into a Queue ith
    [im, map] = imread('trees.tif');
    Queue{Calc_idx+1} = {im, map};
    Calc_idx = Calc_idx + 1;
end

tmr_callback.m

% Create a GUI if there is any unshown images in the Queue
% and if open figures are less than maximum number of figures
if show_idx < Calc_idx && num_open_figs < max_num_figs
    num_open_figs = num_open_figs + 1;
    show_idx = show_idx + 1; % Number of shown images
    % Open a figure
    fig(show_idx) = figure('Name', ['Image #' num2str(show_idx)],...
        'CloseRequestFcn', [...
        'temp = str2double(get(txt(' num2str(show_idx) '), ''String'')); ',... % Read the text edit
        'if isnan(temp), errordlg(''Please enter the rating.''); ',... % Error if invalid
        'else, rating(' num2str(show_idx) ') = temp; delete(fig(' num2str(show_idx) ')); ',...
        'num_open_figs  = num_open_figs - 1; end']);

    subplot(2,1,1, 'position', [0 0.5 1 0.5]);
    imshow(Queue{show_idx}{:});
    % Text edit
    txt(show_idx) = uicontrol('Units','Normalized',...
        'Style','edit',...
        'Position', [0.3 0.2 0.4 0.2]);
    % turn off the timer if all ratings are asked.
    if (show_idx == num_im)
        stop(tmr);
    end
end

我还建议在用户输入每个数据后将数据（评级）写入文件。例如，您可以使用dlmwrite。

于 2013-06-10T03:34:18.850 回答