US Patent 7321724 Photographic method and photographic apparatus

The photographic method and apparatus take, at the same shooting position, a background image without a subject, a first principal image for outputting, and a second principal image whose shooting conditions differ from those of the first principal image with a camera for photoelectrically picking up an image, a changing device for changing shooting conditions and a shooting controlling device, and extract the subject based on a first difference between the background image and the first principal image and a second difference between the first principal image and the second principal image with an image processing device.