How to plot an intensity graph?

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Gee Cheng Mun 2016-1-11

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评论： Walter Roberson 2016-1-12

I have obtained an average value of red pixel count as well the time involved. How do I plot an intensity graph?

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Walter Roberson 2016-1-11

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在 MATLAB Online 中打开

plot(t, average_red_value_vector);
xlabel('time');
ylabel('Intensity');

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Walter Roberson 2016-1-12

编辑：Walter Roberson 2016-1-12

在 MATLAB Online 中打开

projectdir = fullfile(pwd, 'MyProject');   %or use an absolute path
folder_info = dir(projectdir);
folder_info(~[folder_info.isdir]) = [];   %ignore non-folders
folder_info( ismember({folder_info.name}, {'.', '..'}) ) = [];  %remove . and .. directories
num_folders = length(folder_info);
avg_counts = zeros(1, num_folders);
folder_times = zeros(1, num_folders);
for fold_idx = 1 : num_folders
  this_folder = fullfile( projectdir, folder_info(fold_idx).name );
    folder_times(fold_idx) = ... you didn't say how you know the time
    file_info = dir( fullfile(this_folder, '*.tiff') );  %example image name pattern
    num_files = length(file_info);
    red_count = 0;
    for file_idx = 1 : num_files
      thisfile = fullfile(this_folder, file_info(file_idx).name );
      thisimage = imread(thisfile);
      %determine which pixels count as red
      meets_red_threshold = thisimage(:,:,1) > 180 & thisimage(:,:,2) < 60 & thisimage(:,:,3) < 60;  %strong red compared to G or B ??
      red_count = red_count + nnz(meets_red_threshold);
    end
    avg_count = red_count / num_files;
    avg_counts(fold_idx) = avg_count;
  end
plot(folder_times, avg_counts)

Gee Cheng Mun 2016-1-12

编辑：Gee Cheng Mun 2016-1-12

The folders are named as shown below and they have an equal interval of 180 sec. Those timings below do not have a text file. How can I display those timings in the graph?

Frame 13: 540 - 720

Frame 14: 720 - 900

Frame 15: 900 - 1080

Frame 16: 1080 - 1260

Frame 17: 1260 - 1440

Frame 18: 1440 - 1620

Walter Roberson 2016-1-12

在 MATLAB Online 中打开

In the code I give above, replace

folder_times(fold_idx) = ... you didn't say how you know the time

with

     timestr = regexprep( folder_info(fold_idx).name, {'^[:]+:\s+', '\s+-\s+\d+$'}, {'', ''});
     folder_times(fold_idx) = str2double(timestr);

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