| US 7,515,636 B2 | ||
| Image information conversion apparatus and image information conversion method | ||
| Kazushi Sato, Kanagawa (Japan); Kuniaki Takahashi, Kanagawa (Japan); Teruhiko Suzuki, Chiba (Japan); and Yoichi Yagasaki, Tokyo (Japan) | ||
| Assigned to Sony Corporation, (Japan) | ||
| Filed on Apr. 25, 2005, as Appl. No. 11/113,299. | ||
| Application 11/113299 is a continuation of application No. 09/986435, filed on Nov. 08, 2001, granted, now 6,888,889, filed on May 03, 2005. | ||
| Claims priority of application No. P2000-344491 (JP), filed on Nov. 10, 2000. | ||
| Prior Publication US 2005/0190841 A1, Sep. 01, 2005 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. H04B 1/66 (2006.01) | ||
| U.S. Cl. 375—240.12 | 8 Claims |
| 1. An image information conversion apparatus comprising:
conversion means for converting first image compression information inputted to said image information conversion apparatus
into second image compression information to be outputted from said image information conversion apparatus; each of the first
image compression information and the second image compression information including at least intra-image coded pictures and
inter-image predictive coded pictures; and
scene change detection means operable when said conversion means calculates, based on a variable representative of a complexity
of a screen for each frame of the inputted first image compression information, a target code amount for each frame of the
second image compression information to be outputted for detecting, prior to conversion of an intra-image coded picture of
the first image compression information into an inter-image predictive coded picture of the second image compression information,
whether or not a scene change is included in a frame of the intra-image coded picture to be converted,
wherein, when said scene change detection means detects that a scene change is included in the frame to be converted, said
scene change detection means limits the conversion by said conversion means from the intra-image coded picture of the first
image compression information into an inter-image predictive coded picture of the second image compression information, and
wherein said scene change detection means detects whether or not a scene change is included in the frame to be converted using
an average value of a DC component among predetermined coding units included in each frame.
|