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윤대일(Dae-Il Yoon),김해광(Hae-kwang Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
A number of digital images have been coming into wide use through the Internet and mobile communication. It is necessary to supply a lot of good image contents for the people who want them to develop the industry related to digital images. To do this, the technology to protect the right of the people who made image contents has become very important. Image fingerprint technologies based on image features have been developed to make up for the weak points in them. This paper presents image fingerprint technologies that can distinguish between images depending on each image feature. Image fingerprint referring to visual identifier or visual signature used in MPEG-7 VCE-6. This is because image fingerprint creates fingerprint with the extracted invariant features from the transformed images.
H.264/AVC 동영상 압축율 향상을 위한 DC 오프셋 보정에 기반한 인터 예측 알고리즘
윤대일(Dae Il Yoon),김해광(Hae Kwang Kim) 한국방송·미디어공학회 2011 방송공학회논문지 Vol.16 No.5
H.264/AVC compresses video data by applying DCT transform, quantization and entropy coding processes to the residual signal obtained by inter/intra prediction. This paper proposes a method enhancing an existing DC offset adjustment technology which uses information of neighboring blocks to reduce residual information for improving coding efficiency. DC offset information is not sent over bitstreams, but calculated in the same way both in the decoder and in the encoder. Experimental results show that the proposed method enhances coding efficiency by 0.25% in average BD-Rate compared to H.264/AVC and gives better or worse coding efficiency compared to the existing DC offset method depending on video sequences with coding efficiency degradation by 0.09% in average BD-Rate. This experimental results also show that further coding efficiency improvement is possible by applying the proposed method adaptively to slice or macroblock coding units.