Image display device and displaying method

• US 7,143,351 B1
• Filed: 07/06/2000
• Issued: 11/28/2006
• Est. Priority Date: 07/07/1999
• Status: Expired due to Fees

• Current Assignee: NEC Personal Computers, Ltd.
• Original Assignee: NEC Corporation
• Inventors: Yamada, Toru
• Primary Examiner(s): Sax, Steven P.
• Application Number:
  US09/611,367
• Time in Patent Office: 2,336 Days
• Field of Search: 345/720, 345/721, 345/722, 345/723, 345/724, 345/725, 345/726, 345/804, 345/807, 345/704, 345/638, 345/650, 715719-726, 348/700, 348/701, 348/565, 348/416
• US Class Current: 715/719
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/4316 for displaying supplemental content in a region of the screen, e.g. an advertisement in a separate window
• CPC Class Codes: H04N 5/45 Picture in picture , e.g. displaying simultaneously another television channel in a region of the screen
• CPC Class Codes: H04N 7/012 Conversion between an interlaced and a progressive signal for graphics images G09G2310/0229

Abstract

An image display device for playing-back and displaying binary image data after decoding the above by the frame, comprises an image judging unit for judging the current frame to be a moving image or a static image, based on the time interval between the frames which have been decoded in the past, a scan converting unit for performing scan conversion on the current frame, depending on the judgment result by the image judging unit, and a display for displaying the decoded image through sequential scanning.

Claims

1. An image display device for playing back and displaying decoded binary image data comprising:

a decoding unit decoding the binary image data to obtain said decoded binary image data;

time interval calculating means for calculating a time interval which is an amount of time between a first frame and a second frame of the decoded binary image data;

a display time storing unit for storing the time interval calculated by the time interval calculating means;

image judging means for judging whether a third frame is a moving image or a static image based on the time interval stored in the display time storing unit;

sub-picture combining means for combining a sub-picture with the third frame depending on the judgment by said image judging means; and

displaying means for displaying the third frame

when said image judging means judges the third frame to be a moving image, said sub-picture combining means combines the sub-picture with a frame that follows the third frame, while when said image judging means judges the third frame to be a static image, said sub-picture combining means combines the sub-picture with the third frame.

2. An image display device as set forth in claim 1, wherein

said image judging means judges the third frame to be a static image when the time interval is greater than or equal to a predetermined value, and judges the third frame to be a moving image when the time interval is less than the predetermined value.

3. An image display device as set forth in claim 1, wherein

said image judging means judges the third frame based on the first frame, which is two ahead of the third frame, and the second frame, which is one ahead of the third frame.

4. An image display device as set forth in claim 1, wherein

said image judging means judges the third image based on the first frame, which is two ahead of the third frame, and the second frame, which is one ahead of the third frame;

and

when the time interval is greater than or equal to a predetermined value, said image judging means judges the third frame to be a static image, while when the time interval is less than the predetermined value, said means judges the third frame to be a moving image.

5. An image display device as set forth in claim 1, wherein

said image judging means includes

a storing unit for storing times when each frame is decoded, and

a judging unit for making a judgment on the third frame based on the times stored in said storing unit.

6. An image display device as set forth in claim 1, wherein

when said image judging means judges the third frame to be a moving image, said sub-picture combining means combines the sub-picture with a frame that follows the third frame.

7. An image display device as set forth in claim 1, wherein

when said image judging means judges the third frame to be a static image, said sub-picture combining means combines the sub-picture with the third frame.

8. An image displaying method for displaying binary image data comprising:

decoding the binary image data to obtain decoded binary image date;

decoding sub-picture data associated with said decoded binary image data;

calculating a time interval which is an amount of time between a first frame and a second frame of said decoded binary image data;

storing the calculated time interval;

judging a third frame to be a moving image or a static image, based on the stored, calculated time interval;

displaying the third frame; and

a sub-picture combining step for combining a sub-picture with the third frame

when the third frame is judged to be a moving image in said image judging step, the sub-picture is combined with a frame that follows the third frame, while when the third frame is judged to be a static image in said image judging step, the sub-picture is combined with the third frame in said sub-picture combining step.

9. An image display device for playing-back and displaying binary image data after decoding the binary image data, comprising:

a display time storing unit for storing a time interval between a first frame and a second frame of said decoded binary image data;

image judging unit which judges a third frame to be a moving image or a static image, based on the time interval between the first frame and the second frame stored in the display time storing unit;

sub-picture combining unit which combines a sub-picture with the third frame depending on a judgment result by said image judging means; and

display unit which displays the third frame

when the third frame is judged to be a moving image in said image judging step, the sub-picture is combined with a frame that follows the third frame, while when the third frame is judged to be a static image in said image judging step, the sub-picture is combined with the third frame in said sub-picture combining step.

10. An image display device as set forth in claim 9, wherein

said image judging unit judges the third frame to be a static image when the time interval is greater than or equal to a predetermined value, and judges the third frame to be a moving image when the time interval is less than the predetermined value.

11. An image display device as set forth in claim 9, wherein

said image judging unit makes a judgment on the third frame based on a frame one ahead of the current frame and a frame two ahead of the current frame.

12. An image display device as set forth in claim 9, wherein

said image judging unit makes a judgment on the third frame based on a frame one ahead of the third frame and a frame two ahead of the third frame;

when the time interval is greater than or equal to a predetermined value, said image judging unit judges the third frame to be a static image, while when the time interval is less than the predetermined value, said image judging unit judges the third frame to be a moving image.