LOGO INSERTION IN MPEG TRANSCODER Krit ... - CiteSeerX
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LOGO INSERTION IN MPEG TRANSCODER Krit ... - CiteSeerX
LOGO INSERTION IN MPEG TRANSCODER. Krit Panusopone, Xuemin Chen and Fan Ling. Advanced Technology Department,. Broadband Communications ...
LOGO INSERTION IN MPEG TRANSCODER Krit Panusopone, Xuemin Chen and Fan Ling Advanced Technology Department, Broadband Communications Sector, Motorola, San Diego, CA 92121 ABSTRACT Various studies [1,2] show that a basic architecture of MPEG2 transcoder consists of a cascaded decoder/encoder, shown in Figure 6. Such a transcoder re-uses the motion vectors (MVs) and minimizes the changes of macroblock (MB) mode. One interesting feature that can be added on this type of transcoder is to insert a translucent logo into the transcoded bit-stream. 1. INTRODUCTION A logo often occupies a small area of a picture. It is static from frame to frame. For MPEG-2 video [3], we assume that the logo is in rectangular form. The basic requirements for inserting a logo into a coded MPEG bit-stream are The quality degradation is minimized. The insertion is translucent. A translucent logo in a frame is shown in Figure 7. In this gure, ( ) denotes a pixel value of the video frame and ( ) denotes an original pixel value in the logo. The is the composition parameter and 0 1. The following issues of translucent logo insertion for MPEG video transcoding need to be considered. For a desired insertion area, nding an insertion position such that the logo will e ect a minimum number of coded MBs. For the MBs which is e ected by the logo insertion, how to re ne the motion vectors and quantization steps such that the coding is more ecient and the impact on coding algorithm is small (which means low complexity). In order to insert a logo to a video we need to know the desired position, and the width and the height of the hypothetical box that bounds the logo tightly (any single row or column in the box are part of the logo). We position the box up to the MB level so as to minimize the number of MBs containing by the logo. The exact position of the box on a video then equals to the desired position in pixel rounded down to the nearest mulitple of 16. In other words, the logo is aligned to the nearest top left MB on a video. In this paper, all MBs inside the hypothetical box will be called logo MBs. We will present two methods for translucent logo insertion in the MPEG transcoder in this paper. The rst p x; y
