Predetermined indicia are detected in a digital image that is formed by optical scanning. Alternatively, or in addition, a digital image can have a predefined insertion field. Input and/or an optically scanned image is substituted in the digital image for the predetermined indicia and/or for the predefined...http://www.google.com.hk/patents/US7542160?utm_source=gb-gplus-share專利 US7542160 - Rendering with substituted validation input
