function data = preprocessData(data,targetSize)
    % Resize image and bounding boxes to targetSize.
    sz = size(data{1},[1 2]);
    scale = targetSize(1:2)./sz;
    data{1} = imresize(data{1},targetSize(1:2));
    
    % Sanitize box data, if needed.
    data{2} = helperSanitizeBoxes(data{2}, sz);
    
    % Resize boxes.
    data{2} = bboxresize(data{2},scale);
end