Hyundai Electronics Industries Co. Ltd.

Ji Heon Kweon

Joo Hee Moon

Jae Won Chung

Jae Kyoon Kim

A method for coding a digital moving video including gray scale shape information. Picture-unit overhead information is first transmitted and it is then determined whether a video packet to be coded is a first packet of a given picture. A video packet header including overhead information for the decoding of the gray scale shape information is transmitted if the video packet is not the first packet of the given picture. Then, it is determined whether the given picture is an intra picture. If the given picture is the intra picture, the video packet is coded and transmitted in an intra picture mode. If the given picture is not the intra picture, the video packet is coded and transmitted in an inter picture mode. If the video packet is not a last packet of the given picture, a digital moving video coding operation is performed repeatedly. The digital moving video coding operation is ended if the video packet is the last packet of the given picture. Even when the coded video packet is transmitted through a channel where a transmission error may often occur, such as a mobile communication channel, a decoder can perform an error concealment operation of high performance to reconstruct a moving picture of high quality.

Method for coding digital moving video including gray scale shape information

A method and an apparatus for predictively coding shape information of a video signal. An error between the current shape information and the previous shape information is obtained through the comparison therebetween. If the obtained error is greater than or equal to a predetermined reference value, the current shape information is coded. However, in the case where the obtained error is smaller than the predetermined reference value, the current shape information is reconstructed using the previous shape information. Therefore, a time-axis redundancy of the shape information is removed to prevent the transmission of unnecessary information, resulting in an increase in compression coding efficiency.

Method and apparatus for predictively coding shape information of video signal

A method and an apparatus for predictively coding a contour of a video signal. An error between the current contour and the previous contour is obtained through the comparison therebetween. If the obtained error is greater than or equal to a predetermined reference value, the current contour is coded. However, in the case where the obtained error is smaller than the predetermined reference value, only a signal indicative of the reconstruction of the current contour using the previous contour is transmitted to a decoder. Therefore, the transmission of unnecessary information is prevented to enhance the compression coding efficiency.

Growing community of inventors

Seoul, South Korea

Ji Heon Kweon