Patent ID: 7580615

Claim:
A sub-picture processing method, suitable for a video/audio playing apparatus for reading a video/audio data, wherein the video/audio data comprises a data of N sub-picture, wherein the data of each sub-picture comprises a sub-picture control image data, said sub-picture control image data comprises a sub-picture control command and a sub-picture image data, the video/audio playing apparatus comprises a sub-picture decoding unit, and the sub-picture processing method comprising: when the M th sub-picture is enabled, requesting, at the sub-picture decoding unit, the sub-picture control command and the sub-picture image data corresponding to the M th sub-picture when the current displaying position in the vertical direction is on the predetermined displaying position of the M th sub-pictures in the vertical direction; and decoding the sub-picture image data and then outputting a sub-picture image signal after the sub-picture image signal is obtained; and repeating the foregoing steps until the current displaying position reaches the bottom of the image, wherein M and N are natural numbers and M≦N.