Device for and method of converting a frame rate in a moving picture decoder, and a record medium and an integrated circuit device for implementing such a method

A method of converting a frame rate in a moving picture decoder in which encoded moving picture data whose output frame rate has been set to 24 Hz is decoded and in which pictures are provided at an output frame rate of 30 Hz or 60 Hz based on the decoded moving picture data, said method comprising the steps of:

• a header information extracting step for extracting repeat-first-field information, progressive-sequence information and progressive-frame information contained in an input stream corresponding to each picture as header information from said stream;
• a storing step for storing said header information extracted in said header information extracting step;
• a controlling step for reading said header information stored in said storing step in accordance with an order in which said pictures are displayed, causing a 3:2 pull-down display to be performed when paid repeat-first-field information contained in the relevant header information indicates a re-display of the relevant picture, determining whether each picture is for the progressive scanning based on said progressive-sequence information when said repeat-first-field information does not indicate a re-display of the relevant picture, and carrying out a control to re-display one field of a picture once every two frames when the result of said determination indicates the progressive scanning;
• and
• an outputting step for outputting picture data in accordance with instructions by said controlling step.

A computer readable record medium on which is recorded a frame-rate converting program for decoding encoded moving picture data whose output frame rate has been set to 24 Hz and providing pictures at an output frame rate of 30 Hz or 60 Hz based on the decoded moving picture data, said frame-rate converting program is for causing a computer to execute:

• a header information extracting step for extracting repeat-first-field information, progressive-sequence information and progressive-frame information contained in an input stream corresponding to each picture as header information from said stream;
• a storing step for storing said header information extracted in said header information extracting step;
• a controlling step for reading said header information stored in said storing step in accordance with an order in which said pictures are displayed, causing a 3:2 pull-down display to be performed when said repeat-first-field information contained in the relevant header information indicates a re-display of the relevant picture, determining whether each picture is for the progressive scanning based on said progressive-sequence information when said repeat-first-field information does not indicate a re-display of the relevant picture, and carrying out a control to re-display one field of a picture once every two frames when the result of said determination indicates the progressive scanning;
• and
• an outputting step for outputting picture data in accordance with instructions by said controlling step.

An integrated circuit device provided with a frame-rate converting circuit for decoding encoded moving picture data whose output frame rate has been set to 24 Hz and outputting pictures at an output frame rate of 30 Hz or 60 Hz based on the decoded moving picture data, said integrated circuit device comprising:

• a header information extracting section for extracting repeat-first-field information, progressive-sequence information and progressive-frame information contained in an input stream corresponding to each picture as header information from said stream;
• a storage section for storing said header information extracted by said header information extracting section;
• a control section for reading said header information stored in said storage section in accordance with an order in which said pictures are displayed, causing a 3:2 pull-down display to be performed when said repeat-first-field information contained in the relevant header information indicates a re-display of the relevant picture, determining whether a picture is for the progressive scanning based on said progressive-sequence information when said repeat-first-field information does not indicate a re-display of the relevant picture, and carrying out a control to re-display one field of a picture once every two frames when the result of said determination indicates the progressive scanning;
• and
• an output section for outputting picture data in accordance with instructions from said control section.