1. An image processing device comprising: a non-reference viewpoint warping unit configured to perform a warping operation toward a non-reference viewpoint on one of a depth image and a color image of a reference viewpoint, the reference viewpoint being a viewpoint serving as a reference point, the non-reference viewpoint being a viewpoint other than the reference viewpoint; a detecting unit configured to detect an occlusion region by using one of a depth image and a color image of the non-reference viewpoint, the occlusion region being formed when a viewpoint is converted from the reference viewpoint to the non-reference viewpoint, the depth image and the color image of the non-reference viewpoint being obtained through the warping operation performed by the non-reference viewpoint warping unit; a transmitting unit configured to transmit the occlusion region of the depth image of the non-reference viewpoint; and a multiplexer configured to generate a depth multiplexed image by multiplexing a first occlusion region of a depth image of a first non-reference viewpoint and a second occlusion region of a depth image of a second non-reference viewpoint, the first occlusion region being formed when a viewpoint is converted from the reference viewpoint to the first non-reference viewpoint, the second occlusion region being formed when a viewpoint is converted from the reference viewpoint to the second non-reference viewpoint, wherein the transmitting unit transmits the depth multiplexed image generated by the multiplexer.