Unsung Heroes : Celebrating the Pioneers of Black Cinema

Many of them went unnoticed during their careers in Hollywood - but the Academy Museum in LA has a major exhibition on the contribution Black artists made to early cinema.

They also celebrate actress Hattie McDaniel, the first Black actor to win an Oscar - but who had to sit segregated from other artists.

Tom Brook went behind the scenes at Regeneration: Black Cinema at LA's Academy Museum to find out about their work.