Pieces of white balance information indicating color features of a colored picture or picture blocks obtained by partitioning the colored picture are extracted from piece of picture data of the colored picture in an extracting unit. Whether or not a white region exist in the colored picture is judged...http://www.google.com.au/patents/US5619347?utm_source=gb-gplus-sharePatent US5619347 - Apparatus for calculating a degree of white balance adjustment for a picture
