| 摘要 |
<p>A virtually transparent magnetic layer is included as an additional layer in a color negative film. Information exchange between various users of the film -such as (for example) the manufacturer, the camera user, the dealer and photofinisher- is carried via plural longitudinal magnetic tracks on the film that begin and end within each individual frame. Each track is dedicated to the writing and reading of a predetermined set of parameters relating to the corresponding frame. The photofinisher-dedicated tracks fill the image-bearing area of each frame. The film has only a single film perforation along one edge for each frame. The camera-dedicated tracks lie along the edges of the film between the film perforations. Each track begins and ends within a single frame, and is divided into a plurality of fields. The data in each field is identified by an ID code preceded by an ID sentinel at the beginning of the field, and the beginning and end of each track is labeled with start and stop symbols respectively. Each sentinel consists of a character reserved from a universal dictionary of allowed characters, while each ID code is specified in a universal dictionary of ID codes encompassing all recordable film-related parameters or information types.</p> |
