Method of superimposing data of character on video data

• US 5,301,027 A
• Filed: 03/23/1993
• Issued: 04/05/1994
• Est. Priority Date: 03/24/1992
• Status: Expired due to Term

• Current Assignee: JVC Kenwood Corporation
• Original Assignee: Victor Company of Japan Limited (JVC Kenwood Corporation)
• Inventors: Kinoshita, Kohsuke, Monma, Toshihiko, Yamada, Hiroshi, Kiyofuji, Takashi
• Primary Examiner(s): Groody, James J.
• Assistant Examiner(s): HSIA, SHERRIE Y
• Application Number:
  US08/035,776
• Time in Patent Office: 378 Days
• Field of Search: 358/183, 358/22 P, 358/22, 358/180, 358/147, 358/185, 358/451, 358/452, 340/721, 340/731, 382/56, 382/47
• US Class Current: 348/589
• CPC Class Codes: H04N 19/467 characterised by the embedded information being invisible, e.g. watermarking
• CPC Class Codes: H04N 5/278 Subtitling

Abstract

In a method of superimposing data of a character (mark) on video data, the superimposed video data being subjected to a data compression processing for extracting video data within each of blocks from one frame of the superimposed video data and for data-compressing the extracted video data, the blocks forming one frame, the each block including a predetermined number of two-dimensionally arranged pixels of the superimposed video data, a position of the character superimposed on the video data with respect to a lump of the blocks, where the character is to be imposed, is determined such that the number of blocks over which the character spreads is minimized when a size and a shape of the character or the mark are unchanged. In the method, at least a portion of a body of the character at a middle portion of the block and an outline of the character near a boundary of the block are arranged, or a horizontal (vertical) size of the character in accordance with a natural number times the number of horizontally (vertically) arranged pixels out of the two-dimensionally arranged pixels within the block. Thus, noise occurring around the character at blocks where the character exists is made inconspicuous.

Claims

1. A method of superimposing data of a character or a mark on video data, said superimposed video data being subjected to a data compression processing for extracting video data within each of blocks from one frame of said superimposed video data and for data-compressing said extracted video data, said blocks forming said one frame, said each block including a predetermined number of two-dimensionally arranged pixels of said superimposed video data, comprising the step of:

determining a position of said character or mark superimposed on said video data with respect to a lump of said blocks, where said character or mark is to be imposed, such that the number of blocks over which said character spreads is minimized when a size and a shape of said character or said mark are unchanged.

2. A method as claimed in claim 1, further comprising the step of:

arranging at least a portion of a body of said character or mark at a middle portion of said block and arranging an outline of said character near or tangent to a boundary of said block.

3. A method as claimed in claim 1, further comprising the step of:

determining a horizontal size of said character or mark in accordance with a natural number times the number of horizontally arranged pixels out of said two-dimensionally arranged pixels within said block.

4. A method as claimed in claim 1, further comprising the step of:

determining a vertical size of said character or mark in accordance with a natural number times the number of vertically arranged pixels out of said two-dimensionally arranged pixels within said block.

5. A method of superimposing data of a character or a mark on video data, said superimposed video data being subjected to a data compression processing for extracting video data within each of blocks from one frame of said superimposed video data and for data-compressing said extracted video data, said blocks forming said one frame, said each block including a predetermined number of two-dimensionally arranged pixels of said superimposed video data, comprising the step of:

arranging at least a portion of a body of said character at a middle portion of said block and arranging an outline of said character near or tangent to a boundary of said block.

6. A method as claimed in claim 5, further comprising the step of:

determining a position of said character or mark superimposed on said video data with respect to a lump of said blocks, where said character or mark is to be imposed, such that the number of blocks over which said character spreads is minimized when a size and a shape of said character are unchanged.

7. A method as claimed in claim 5, further comprising the step of:

determining a horizontal size of said character or mark in accordance with a natural number times the number of horizontally arranged pixels out of said two-dimensionally arranged pixels within said block.

8. A method as claimed in claim 5, further comprising the step of:

determining a vertical size of said character or mark in accordance with a natural number times the number of vertically arranged pixels out of said two-dimensionally arranged pixels within said block.

9. A method of superimposing data of a character or a mark on video data, said superimposed video data being subjected to a data compression processing for extracting video data within each of blocks from one frame of said superimposed video data and for data-compressing said extracted video data, said blocks forming said one frame, said each block including a predetermined number of two-dimensionally arranged pixels of said superimposed video data, comprising the step of:

determining a horizontal size of said character or mark in accordance with a natural number times the number of horizontally arranged pixels out of said two-dimensionally arranged pixels within said block.

10. A method as claimed in claim 9, further comprising the step of:

arranging at least a portion of a body of said character or mark at a middle portion of said block and arranging an outline of said character near or tangent to a boundary of said block.

11. A method as claimed in claim 9, further comprising the step of:

determining a position of said character or mark superimposed on said video data with respect to a lump of said blocks, where said character or mark is to be imposed, such that the number of blocks over which said character spreads is minimized when a size and a shape of said character or said mark are unchanged.

12. A method of superimposing data of a character or a mark on video data, said superimposed video data being subjected to a data compression processing for extracting video data within each of blocks from one frame of said superimposed video data and for data-compressing said extracted video data, said blocks forming said one frame, said each block including a predetermined number of two-dimensionally arranged pixels of said superimposed video data, comprising the step of:

determining a vertical size of said character or mark in accordance with a natural number times the number of vertically arranged pixels out of said two-dimensionally arranged pixels within said block.

13. A method as claimed in claim 12, further comprising the step of:

determining a position of said character or mark superimposed on said video data with respect to a lump of said blocks, where said character or mark is to be imposed, such that the number of blocks over which said character spreads is minimized when a size and a shape of said character or said mark are unchanged.

14. A method as claimed in claim 12, further comprising the step of:

arranging at least a portion of a body of said character at a middle portion of said block and arranging an outline of said character near or tangent to a boundary of said block.

15. A method of superimposing data of a character or a mark on video data, said superimposed video data being subjected to a data compression processing for extracting video data within each of blocks from one frame of said superimposed video data and for data-compressing said extracted video data, said blocks forming said one frame, said each block including a predetermined number of two-dimensionally arranged pixels of said superimposed video data, comprising the step of:

determining a position of said character or mark superimposed on said video data with respect to a lump of said blocks, where said character or mark is to be imposed, such that the number of blocks over which said character spread is minimized when a size and a shape of said character or said mark are unchanged;

arranging at least a portion of a body of said character or mark at a middle portion of said block and arranging an outline of said character near or tangent to a boundary of said block;

determining a horizontal size of said character or mark in accordance with a first natural number times the number of horizontally arranged pixels out of said two-dimensionally arranged pixels within said block;

determining a vertical size of said character or mark in accordance with a second natural number times the number of vertically arranged pixels out of said two-dimensionally arranged pixels within said block.