I have used bwconncomp to count the number of objects in successive frames of a video. There are 99 frames, and therefore I have a 1x99 cell. Each struct in the cell contains 4 pieces of data, the third of which is number of objects. I am trying to see how the number of objects changes throughout the frames, so I essentially need to plot the number of objects from the structs in the cell array against the frames from 1 to 99. I'm aware I can't plot data directly from a cell, however I have tried to extract the data from the cell, but am struggling to plot any data at all. I have attached the whole code below for relevance, however the majority of it is just subtracting backgrounds and changing the images so the objects can be found. Any ideas on how I can extract the number of objects in each struct in the cell, and therefore plot it vs the frame it relates to?
folder = fullfile('Folder1\Folder1\Frames');
filePattern = fullfile(folder, '*.jpg');
fileList = dir(filePattern);
numberOfFiles = numel(fileList);
subtractionFileName = 'subtract.jpg';
if ~isfile(subtractionFileName)
errorMessage = sprintf('Subtraction image not found:\n%s', subtractionFileName);
uiwait(errordlg(errorMessage));
return;
end
backgroundImage = imread(subtractionFileName);
for k = 1:numberOfFiles
baseFileName = fileList(k).name;
if contains(baseFileName, 'subtract', 'IgnoreCase', true)
continue;
end
fullFileName = fullfile(fileList(k).folder, baseFileName);
fprintf(1, 'Now reading %s\n', fullFileName);
thisImage = imread(fullFileName);
subtractionImage{k} = backgroundImage - thisImage;
imshow(subtractionImage{k}, [])
caption = sprintf('Image #%d of %d : %s', k, numberOfFiles, baseFileName);
title(caption, 'Interpreter', 'none');
drawnow;
end
for k = 1:numberOfFiles
graySubtractedImage{k}=rgb2gray(subtractionImage{k});
binaryImage{k} = graySubtractedImage{k}>114;
binaryImage{k} = imclearborder(binaryImage{k});
BW1{k} = bwareaopen(binaryImage{k},75);
BW2{k} = bwconncomp(BW1{k});
end
