A virtual 3-D object video signal V1 is produced by performing a 3-D image transformation for a source video signal, and a 2-D objet video signal V2 for virtually representing the 3-D image transformation is produced by projecting the object video signal V1 onto an X-Y plane. Further, 3-D shadow signals...http://www.google.de/patents/US6014472?utm_source=gb-gplus-sharePatent US6014472 - Special effect device, image processing method, and shadow generating method
