System and method for compressing a picture

• US 20090251470A1
• Filed: 10/22/2008
• Published: 10/08/2009
• Est. Priority Date: 12/11/2007
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Oh, Seungtaik, Lee, Seung Wook, Koo, Bon Ki, Lee, Ji Hyung, Kim, Ho Won, Chu, Chang Woo, Kim, Jin Seo
• Application Number:
  US12/289,170
• Publication Number:
  US 20090251470A1
• Time in Patent Office: Days
• US Class Current: 345/473
• CPC Class Codes: G06T 9/001 Model-based coding, e.g. wire frame
• CPC Class Codes: H04N 19/25 with scene description coding, e.g. binary format for scenes [BIFS] compression

Abstract

A system for compressing a picture includes: an information extraction unit for extracting information needed for encoding during a picture scene composition and animation process using a modeling object; and a rendering unit for generating an uncompressed picture sequence by rendering the object where the picture scene composition and animation process is performed. Further, the system for compressing a picture includes an encoding unit for generating a compressed bit stream by encoding the picture sequence from the rendering unit based on the information extracted by the information extraction unit.

Claims

1. A system for compressing a picture comprising:

an information extraction unit for extracting information needed for encoding during a picture scene composition and animation process using a modeling object;

a rendering unit for generating an uncompressed picture sequence by rendering the object where the picture scene composition and animation process is performed; and

an encoding unit for generating a compressed bit stream by encoding the picture sequence from the rendering unit based on the information extracted by the information extraction unit.

2. The system of claim 1, wherein the encoding unit converts the information extracted by the information extraction unit into a compressed bit stream format and encodes the picture sequence generated from the rendering unit by using the converted information.

3. The system of claim 1, wherein the information extraction unit extracts at least one of contour information, scene composition information and motion information of the object and rendering information based on light as the information needed for the encoding.

4. The system of claim 3, wherein the encoding unit includes a scene composition and contour information generation unit for converting the contour and scene composition information of the object into the compressed bit stream format;

a motion vector generation unit for generating motion vectors by converting the motion information of the object into the compressed bit stream format; and

a rate control unit for determining the number of bits to be assigned to each part in a picture of the picture sequence based on light information and the rendering information based on light, encoding of the picture sequence being performed by adaptively applying information generated from the scene composition and contour information generation unit, the motion vector generation unit and the rate control unit.

5. The system of claim 4, wherein the scene composition and contour information generation unit forms a BIFS (Binary Format For Scenes) for picture segmentation and scene composition by using the contour and scene composition information of the object.

6. The system of claim 4, wherein the rendering information based on light includes at least one of light position and characteristics for each scene, reflection position by the light and a rendering parameter for the light.

7. A method for compressing a picture comprising:

extracting information needed for encoding during a picture scene composition and animation process using a modeling object;

generating an uncompressed picture sequence by rendering the object where the picture scene composition and animation process is performed; and

generating a compressed bit stream by encoding the picture sequence based on the extracted information needed for the encoding.

8. The method of claim 7, wherein generating a compressed bit stream further includes converting the extracted information into a compressed bit stream format, the compressed bit stream being generated by encoding the picture sequence using the converted information.

9. The method of claim 7, wherein the information needed for the encoding includes at least one of contour information, scene composition information and motion information of the object and rendering information based on light as the information needed for the encoding.

10. The method of claim 9, wherein generating a compressed bit stream further includes:

converting the contour and scene composition information of the object into the compressed bit stream format;

generating motion vectors by converting the motion information of the object into the compressed bit stream format; and

determining the number of bits to be assigned to each part in a picture of the picture sequence based on light information and the rendering information based on light, encoding of the picture sequence being performed by adaptively applying information generated from converting the contour and scene composition information of the object, generating motion vectors and determining the number of bits to be assigned to each part.