displayTrackingResults.m

% function showId = displayTrackingResults( frame,mask,showId)
% draws a bounding box and label ID for each track on the video frame and the foreground mask. 
% It then displays the frame and the mask in their respective video players
% Inputs:   
%             frame                        frame
%             mask:                        array
%             showId:                      integer
% Outputs:
%             showId:                      integer
function showId = displayTrackingResults( frame,mask,showId)
    global obj;
    global tracks;
    % Convert the frame and the mask to uint8 RGB.
    frame = im2uint8(frame);
    mask = uint8(repmat(mask, [1, 1, 3])) .* 255;

    minVisibleCount = 8;
    if ~isempty(tracks)

    	% Noisy detections tend to result in short-lived tracks.
        % Only display tracks that have been visible for more than
        % a minimum number of frames.
        reliableTrackInds = ...
            [tracks(:).totalVisibleCount] > minVisibleCount;
        reliableTracks = tracks(reliableTrackInds);
            
        for i=1:length(tracks)
            if reliableTrackInds(i) == 1 && tracks(i).showId == 0
                tracks(i).showId = showId;
                showId = showId + 1;
            end
        end
                    
        % Display the objects. If an object has not been detected
        % in this frame, display its predicted bounding box.
        if ~isempty(reliableTracks)
        % Get bounding boxes.
        bboxes = cat(1, reliableTracks.bbox);

        % Get ids.
        ids = int32([reliableTracks(:).showId]);

        % Create labels for objects indicating the ones for
        % which we display the predicted rather than the actual
        % location.
        labels = cellstr(int2str(ids'));
        predictedTrackInds = ...
            [reliableTracks(:).consecutiveInvisibleCount] > 0;
        isPredicted = cell(size(labels));
        isPredicted(predictedTrackInds) = {' predicted'};
        labels = strcat(labels, isPredicted);

        % Draw the objects on the frame.
        for i=1:length(labels)
        frame = insertObjectAnnotation(frame, 'circle', ...
            [tracks(i).particles(:,1),tracks(i).particles(:,2) ones(size(tracks(i).particles,1),1)*1],labels(i));
        end
        frame = insertObjectAnnotation(frame, 'rectangle', ...
            bboxes, labels);
            % Draw the objects on the mask.
            mask = insertObjectAnnotation(mask, 'rectangle', ...
                bboxes, labels);
            end
    end

	% Display the mask and the frame.
	obj.maskPlayer.step(mask);
	obj.videoPlayer.step(frame);
end