A method for encoding image data according to the present invention includes the steps of: specifying a type of a picture in a picture sequence including an I-picture, a P-picture and a B-picture; determining a position of at least one slice header in the picture in accordance with the type of the picture;...http://www.google.com.tw/patents/US5557331?utm_source=gb-gplus-share專利 US5557331 - Image encoding method, an image encoding circuit, an image encoding apparatus, and an optical disk