An image pickup apparatus which is capable of forming an image signal having a high resolution when a monotone image is photographed by a structure having a switching circuit for switching between a first photographing mode in which an electric signal transmitted from an image pickup device is used to...http://www.google.com.au/patents/US6449013?utm_source=gb-gplus-sharePatent US6449013 - Image pickup apparatus capable of taking color natural images and high-resolution images of a monochrome object
