METHOD AND DIGITAL VIDEO ENCODER SYSTEM FOR ENCODING DIGITAL VIDEO DATA

• US 20120320979A1
• Filed: 06/08/2012
• Published: 12/20/2012
• Est. Priority Date: 06/16/2011
• Status: Active Grant

• Current Assignee: Axis AB (Canon Inc.)
• Original Assignee: Axis AB (Canon Inc.)
• Inventors: LUNDBERG, Stefan
• Granted Patent: US 9,332,279 B2
• Time in Patent Office: Days
• US Class Current: 375/240.13
• CPC Class Codes: H04N 19/105 Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
• CPC Class Codes: H04N 19/107 between spatial and temporal predictive coding, e.g. picture refresh
• CPC Class Codes: H04N 19/124 Quantisation
• CPC Class Codes: H04N 19/137 Motion inside a coding unit, e.g. average field, frame or block difference
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/593 involving spatial prediction techniques
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/86 involving reduction of coding artifacts, e.g. of blockiness

Abstract

A method is used for encoding digital video data corresponding to a sequence of original input video frames. The method comprises: encoding a first original input video frame into an INTER-frame; decoding and reconstructing said INTER-frame into a reference frame; creating an INTRA input frame comprising information from both a second original input video frame and said reference frame; and encoding said INTRA input frame into an INTRA-frame. A digital video encoder system is used for encoding digital video data corresponding to a sequence of original input video frames by encoding the sequence of original input video frames using INTRA- and INTER-mode.

Claims

1. A method for encoding digital video data corresponding to a sequence of original input video frames, comprising:

encoding a first original input video frame into an INTER-frame,

decoding and reconstructing the INTER-frame into a reference frame,

creating an INTRA input frame comprising information from both a second original input video frame and the reference frame, and

encoding the INTRA input frame into an INTRA-frame.

2. The method according to claim 1, further comprising

dividing the second original input frame into sub areas,

for each sub area of the second original input frame, determining a level of motion in the sub area of the second original input video frame.

3. The method according to claim 2, wherein a ratio of information from the second original input frame and the reference frame used for creating a sub area of the INTRA input frame corresponding to a sub area of the second original input frame is based on the level of motion identified in the corresponding sub area of the second original input frame.

4. The method according to claim 3, wherein a first sub area of the INTRA input frame is created using information exclusively from the second original input video frame.

5. The method according to claim 3, wherein a second sub area of the INTRA input frame is created using information exclusively from the reference frame.

6. The method according to claim 3, wherein a third sub area of the INTRA input frame is created using information from both the second original input video frame and the reference frame.

7. The method according to claim 1, further comprising encoding an area of the INTRA input frame mainly based on information from the second original input video frame at a first quantization value and encoding an area of the INTRA input frame mainly based on information from the reference frame at a second quantization value, wherein the second quantization value is different than the first quantization value.

8. The method according to claim 1, wherein the INTER-frame is a P-frame or a B-frame and the INTRA frame is an I-frame.

9. A computer-readable recording medium having recorded thereon a program, that when executed, performs the method according to claim 1.

10. A digital network camera comprising the computer readable recording medium of claim 9, and a processor arranged to execute the program recorded on the computer-readable recording medium.

11. A digital video encoder system for encoding digital video data corresponding to a sequence of original input video frames by encoding the sequence of original input video frames using INTRA- and INTER-mode, comprising:

an encoder module being arranged to process input frames into an INTRA-frame or an INTER-frame;

a decoder module being arranged to decode the INTRA- or the INTER-frame encoded by the encoder;

a motion compensation module being arranged to use the information from the decoder module in order to reconstruct the encoded frame into a reference frame; and

an INTRA input frame construction module being arranged to create an INTRA input frame using information from an original input video frame as well as information from a previously encoded and reconstructed reference frame, wherein the encoder module when encoding an INTRA-frame is arranged to use the INTRA input frame being constructed by means of the INTRA input frame construction module;

wherein the INTRA input frame construction module is arranged to use information from a reference frame being formed by encoding a first original input video frame into an INTER-frame and thereafter reconstructing the INTER-frame into the reference frame and information from a second original input frame to create the INTRA input frame.

12. The digital video encoder system according to claim 11, further comprising a motion detection module arranged to detect a level of motion in sub areas of the original input video frame, wherein the INTRA input frame construction module is arranged to decide the ratio of information from the original input frame and the reference frame to be used to create a sub area of the INTRA input frame corresponding to a sub area of the original input frame based on the level of motion identified in the corresponding sub area of the original input frame by the motion detection module.

13. The digital video encoder system according to claim 11, wherein the digital video encoder system is implemented in a surveillance camera.