Apparatus and method for converting image data

Details Apparatus and method for converting image data Apparatus and method for converting image data

2006-08-08

2006-08-08

Kelley, Chris (Department: 2617)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C375S240250

Reexamination Certificate

active

07088775

ABSTRACT:
An image data converting apparatus comprising an MPEG2-image data decoding section19, a scan-converting section20, an MPEG4-image encoding section21, and a picture-type determining section18. The MPEG2-image data decoding section19decodes input MPEG2-image compressed data in both the vertical direction and the horizontal direction by using only lower, fourth-order coefficients. The scan-converting section20converts interlaced-scan pixel data to sequential-scan pixel data. The MPEG4-image encoding section21generates MPEG4-image compressed data from the sequential-scan pixel signals. The sections19, 20and21are connected in series. The picture-type determining section18is connected to the input of the MPEG2-image data decoding section19. The section18determines the picture type of each frame data contained in the interlaced-scan MPEG4-picture compressed data, outputs only the frame data about I/P pictures, discards the frame data about B pictures, thereby converting the frame rate.

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Feamster, Wee, Apostolopoulos; Field-to-Frame Transcoding with Spacial and Temporal Downsampling; 1999; IEEE.

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