Smiling in spite of how you actually feel does not make you happy, contrary to what the people at Canon seem to think.
If you read the linked piece, you might think that this would only happen in china, but there are countless examples of western firms employing similarly ghastly techniques, sometimes even in more nefarious ways, as I've written about this before.
I personally think that if one has to resort to surveillance to ensure productivity and compliance, then it's the culture of the company that is the issue, not its employees. Humans will always be humans and do what humans do, no matter how much some wanna-be big brother think they can alter human nature with coercion.
I'm a much bigger fan of incentives, to get people to get you the results you want, not unlike good copywriting, which will nudge people to take the action that you want them to take, on their own volition.