One of Sony’s crown jewels in its empire is its image sensor business, which dominates global market share and has helped the company hit record profits. But now a famous investor is calling for Sony to spin-off the sensor business into a completely independent company. The Nikkei Asian Review reports that American activist investor Daniel Loeb has invested in a $1.5 billion stake in Sony and is now calling on the company to spin off its sensor business “to unlock…