Browse Prior Art Database

BI-DIRECTIONAL INTERLACING SCHEME FOR VIDEO SEQUENCE COMPRESSION

IP.com Disclosure Number: IPCOM000014220D
Original Publication Date: 2000-May-01
Included in the Prior Art Database: 2003-Jun-19
Document File: 3 page(s) / 91K

Publishing Venue

IBM

Abstract

Disclosed is a novel approach to interlacing video streams. The bi-directional interlacing scheme, proposed herein, defines a cyclic process of dividing up individual video frames into "pixels of interest". Only the "pixels of interest" are used in the compression stage. The "pixels of interest" are chosen in a manner that best utilizes the characteristics of the human visual system. By interlacing the individual video frames in both the horizontal and vertical directions, an immediate compression ratio of 25% is achieved before standard compression ratios are applied to the data stream. This approach can be applied to any sequential video stream such as digital movies or live captured video. This interlacing scheme when used in conjunction with pixel differencing image processing algorithms facilitates extremely high compression ratios which are required to transmit video streams across low bandwidth networks such as the Internet. Horizontal video frame interlacing is a well known approach to doubling the video frame refresh rate. Figure 1 below shows an example of an individual interlaced video frame. Figure 1: An enlarged portion of an interlaced video frame

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  BI-DIRECTIONAL INTERLACING SCHEME FOR VIDEO SEQUENCE COMPRESSION

   Disclosed is a novel approach to interlacing video streams. The bi-directional interlacing scheme, proposed herein, defines a cyclic process of dividing up individual video frames into "pixels of interest". Only the "pixels of interest" are used in the compression stage. The "pixels of interest" are chosen in a manner that best utilizes the characteristics of the human visual system. By interlacing the individual video frames in both the horizontal and vertical directions, an immediate compression ratio of 25% is achieved before standard compression ratios are applied to the data stream.

This approach can be applied to any sequential video stream such as digital movies or live captured video. This interlacing scheme when used in conjunction with pixel differencing image processing algorithms facilitates extremely high compression ratios which are required to transmit video streams across low bandwidth networks such as the Internet.

Horizontal video frame interlacing is a well known approach to doubling the video frame refresh rate. Figure 1 below shows an example of an individual interlaced video frame.

Figure 1: An enlarged portion of an interlaced video frame

The bi-directional interlacing approach takes this concept to the next level. In bi-directional interlacing both the horizontal and vertical scan lines are sampled, as displayed in figure 2.

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    Figure 2: An enlarged portion of a video frame which is interlaced in both the horizontal and vertical interlaced video frame

Referring to figure 2 above only the "pixels of...