| 摘要 |
An image file system provides for storing image data in a file (23) in progressively enhanced sections, a first section (29) having reduced pixels resolution and minimal color specification, each subsequent section (31, 33, 35, 37,...) adding additional data for one or both of finer pixel resolution and more complete color, until a last image section provides final data addition for maximum resolution and color. A pointer in the header section (25) of the file points to section location. A sound bite in the sound section (27), which is optional, provides sound accompanying the image file. In this system, video stations of different complexity and capability can specify just those portions of a progressively sectioned file needed for the display, thereby avoiding the bandwidth requirement for downloading the entire file. In a preferred system, a YUV-style protocol is used, so a first section (29) can specify only colorless gray scale data for an image. In use for video frames the file system allows smooth video even in cases of severe bandwidth degradation, as the minimal first section will provide a decent gray-scale image.
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