Fast video browsing system

• US 5,754,728 A
• Filed: 08/02/1996
• Issued: 05/19/1998
• Est. Priority Date: 08/11/1995
• Status: Expired due to Term

• Current Assignee: KDDI Corporation
• Original Assignee: Kokusai Densin Denwa Kabushiki Kaisha
• Inventors: Kanoh, Tamotsu, Hori, Hironao, Nakajima, Yasuyuki, Ujihara, Kiyono
• Primary Examiner(s): Chevalier, Robert
• Application Number:
  US08/691,355
• Time in Patent Office: 655 Days
• Field of Search: 348/699, 348/700, 348/701, 348/416, 348/402, 386/68, 386/67, 386/5, 386/6, 386/7, 386/110, 360/32
• US Class Current: 386/343
• CPC Class Codes: H04N 5/145 Movement estimation for video coding H04N19/51
• CPC Class Codes: H04N 5/783 Adaptations for reproducing at a rate different from the recording rate
• CPC Class Codes: H04N 5/85 on discs or drums
• CPC Class Codes: H04N 9/8042 involving data reduction

Abstract

To provide a fast video browsing system in which a fast playback suitable for keeping track of the contents can be performed by adaptively determining the number of skipped pictures according to the motion vector of picture, and displaying the picture after the skipped pictures. In step S1, pictures to be fast viewed are sequentially inputted, and in step S2, n pictures are skipped. In step S3, the picture after the n skipped pictures is displayed. In step S4, using the picture before or after the displayed picture with respect to time, a motion vector at one frame interval is detected, and in step S5, the number n of skipped pictures is determined from the motion vector. As a result, the number of skipped pictures can be adaptively determined by the motion vector of a picture.

Claims

1. A fast video browsing system for motion pictures in which by displaying the input pictures after the skipped input pictures on a display, the playback is performed faster than the normal playback to enable the contents of the pictures to be easily kept track of, comprising:

an input means for inputting motion picture data stored in a storage device at a speed higher than the normal playback;

a motion amount detecting means for detecting the motion amount of an input picture inputted to said input means;

a number of skipped pictures determining means for determining the number of skipped pictures from the motion amount of said input picture detected by said motion amount detecting means; and

a display means for continuously displaying with a frame timing only the pictures after those skipped by the number of skipped pictures determined by said number of skipped pictures determining means, thereby to enable the playback and browsing to be performed faster than the normal playback.

2. A fast video browsing system as set forth in claim 1 wherein said means for detecting the motion vector of a motion picture in the input scene uses any one of a single or plurality of pictures existing before and after with respect to time to determine the motion vector of the motion picture in said input scene.

3. A fast video browsing system as set forth in claim 1 wherein said means for detecting the motion vector of a motion picture in the input scene uses both a single or plurality of pictures existing before and after with respect to time to determine the motion vector of the motion picture in said input scene.

4. A fast video browsing system as set forth in claim 1 wherein said means for detecting the motion vector of a motion picture in the input scene determines the movement of a certain area R in the scene as the motion vector of the motion picture in said input scene.

5. A fast video browsing system as set forth in claim 1 wherein said means for detecting the motion vector of a motion picture in the input scene uses the respective motions of a plurality of small areas r in the scene to determine the motion vector of the motion picture in said input scene.

6. A fast video browsing system as set forth in claim 5 wherein said means for detecting the motion vector of a motion picture in the input scene determines the motion vector of the motion picture in said input scene by the picture average of the norms of motion in said respective small areas.

7. A fast video browsing system as set forth in claim 5 wherein said means for detecting the motion vector of a motion picture in the input scene determines the motion vector of the motion picture in said input scene by the norm of the picture average of the motions in each of the x- and y-directions in the respective small areas.

8. A fast video browsing system as set forth in claim 5 wherein said means for detecting the motion vector of a motion picture in the input scene deems the motion vector giving the maximum frequency in the motion vector distribution as the motion vector of the motion picture in said input scene.

9. A fast video browsing system as set forth in claim 1 wherein said means for determining the number of skipped pictures by the motion vector of said motion picture determines said number of skipped pictures so that the motion vector of the motion picture for the skipped motion pictures becomes a constant value.

10. A fast video browsing system as set forth in claim 9 wherein said constant value is decided according to the playback speed.

11. A fast browsing system for motion pictures set forth in claim 1,

wherein said motion amount detecting means detects the motion amounts of the motion pictures in a plurality of scenes which are in the past with respect to time, and averages said plurality of detected motion amounts.

12. A fast video browsing system for motion pictures in which by displaying the input pictures after the skipped input pictures on a display, the playback is performed faster than the normal playback to enable the contents of the pictures to easily be kept track of, comprising:

an input means for inputting the motion picture compressively coding information stored in a storage device at a speed higher than the normal playback;

a motion vector information extracting means for extracting motion vector information from the motion picture compressively coding information inputted to said input means;

a motion amount determining means for determining the motion amount of a motion picture in a scene by using the motion vector extracted by said motion vector information extracting means;

a number of skipped pictures determining means for determining the number of skipped pictures based on the motion amount of said motion picture; and

a display means for continuously displaying with a frame timing only the pictures after those skipped by the number of skipped pictures determined by said number of skipped pictures determining means, thereby to enable the playback and browsing to be performed faster than the normal playback.

13. A fast video browsing system as set forth in claim 12 wherein said means for determining the motion vector of a motion picture in a scene uses any one of the motion vector information extracted from single or plurality of coded video information existing before and after with respect to time, thereby to determine the motion vector of the motion picture in said scene.

14. A fast video browsing system as set forth in claim 12 wherein said means for determining the motion vector of a motion picture in a scene uses both of the motion vector information extracted from the single or plurality of coded video information to determine the motion vector of the motion picture in said scene.

15. A fast video browsing system as set forth in claim 12 wherein said means for determining the number of skipped pictures according to the motion vector of the motion picture determines said number of skipped pictures so that the motion vectors of the motion pictures for the skipped pictures become a constant value.

16. A fast video browsing system as set forth in claim 15 wherein said constant value is determined according to the playback speed.