To make a device compact, to reduce energy consumption and reduce a cost of the entire device by emitting light with the same color and uniform light quantity in the case of photographing by supplying small amount of energy to the background.

The light is emitted with the same color and the uniform light quantity in the case of photographing by supplying the small amount of energy to the background 12. An image of an object Ob is picked up with the background 12 by driving en electronic camera 11b at a state that the color of clothes is differentiated from the color of the background 12 by an image processing substrate 11a in the device. Next, a chroma key image is composited by the image processing substrate 11a, in this case, difference between the total image signal value obtained from the electronic camera 11b and an image signal value based on the color of the background 12 is calculated. In this case, the difference becomes zero regarding a part corresponding to the background 12. Therefore, segmentation of the object Ob is enabled by regarding an area in which the difference becomes zero when the chroma key image is composited as the background.