• 대한전자공학회논문지SP
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• 제39권3호
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• pp.36-41
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• 2002

만화 영상은 비교적 간단하고, 사용 색상의 수가 적으며 동일 색상이나 기울기를 가지는 동질 영역(homogeneous region)이 많이 존재한다. 본 논문에서는 이런 특징을 이용하여 만화 이미지에 효과적인 상보 쿼드트리 압축 방법을 제안하였다. 그리고 영상의 점진전송이 가능하게 하여, 데이터의 전송이 진행되는 동안 수신측에서는 낮은 해상도의 영상에서부터 점진적으로 더 높은 해상도의 영상으로 해상도를 향상시켜 나가게 한다. 이것은 데이터 전송의 초기에 영상의 가치를 판단하여 나머지 부분의 전송을 진행하거나 취소할 수 있어 제한된 전송 대역을 효과적으로 이용할 수 있다. 제안된 방법이 비손실의 점진전송이 가능한 방법이므로 이와 같은 기능을 가진 progressive PNG, progressive GIF와 압축 성능을 비교 하였다.

• 한국통신학회논문지
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• 제25권6B호
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• pp.1002-1011
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• 2000

본 논문에서는 $2{\times}2$ DCT(Discrete Cosine Transform)와 임베디드 제로 트리(Embedded Zero Tree)를 이용한 공간(Spatial) 및 비트율(bit-rate) 계위(scalability)를 갖는 순차 영상 전송 기법을 제안한다. 제안된 방법은 영상의 다해상도 표현을 위해 $2{\times}2$ DCT를 사용하여 고차 웨이브렛 필터에 비해 계산량이 많이 감소하여 실시간 응용에 적합하도록 하였으며, 공간과 비트율 계위를 동시에 가지도록 하여 수신자의 계위 요구에 적응적으로 대응하도록 하였다. 실험 결과 고차 웨이브렛 필터를 이용한 순차 영상 전송과 비교하여 계산량의 상당한 감소에도 불구하고 화질의 차이는 거의 인식할 수 없었다.

• 대한전자공학회논문지
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• 제26권8호
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• pp.1227-1237
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• 1989

In this paper, we propose a lossless progressive image transmission scheme using hierarchical pyramid structure and classified vector quantizer in DCT domain. By adopting DCT to the hierarchical pyramid signals, we can reduce the spatial redundance. Moreover, the DCT coefficients can be encoded efficiently by using classified vector quantizer in DCT domain. The classifier is simply based on the variance of a subblock. Also, the mirror set of training set of images can improve the robustness of codebooks. Progressive image transmission can be achieved through following processes: from top to bottom level of planes in a pyramid, and from high to low AC variance class in a plane. Some simulation results with real images show that the proposed coding scheme yields a good performance at below 0.3 bpp and an excellent result at 0.409 bpp. The proposed coding scheme is well suited for lossless progressive image transmission as well as image data compression.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -1
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• pp.66-69
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• 2000

In this paper, we propose a progressive transmission of a video using a 2$\times$2$\times$2 DCT First of all, the video data is transformed into multiresolution represented video data using a 2$\times$2$\times$2 DCT. Then. it is represented by a 3-D EZT(Embedded Zero Tree) coding fur the progressive transmission with a bit-rate scalability. The proposed progressive transmission algorithm needs much less computations and buffer memories than the higher-order convolution based wavelet filter. Also, since the 2$\times$2$\times$2 DCT requires independent local computations, parallel processing can be applied.

• 정보처리학회논문지B
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• 제9B권1호
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• pp.77-82
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• 2002

영상의 점진적 전송 방식은 데이터의 전송이 진행되는 동안 수신측에서 낮은 해상도의 영상에서부터 점진적으로 더 높은 해상도의 영상으로 해상도를 향상시켜나가는 방법이다. 이것은 데이터 전송의 초기에 영상의 가치를 판단하여 나머지 부분의 전송을 진행하거나 취소할 수 있어 제한된 전송 대역을 효과적으로 이용할 수 있다. 본 논문에서는 효율적인 영상의 점진적 전송을 실현하기 위하여 영상을 비트플래인으로 분리한 후 각 플래인을 상보 쿼드트리 구조로 재구성하였다. 그리고 상보 쿼드트리의 각 레벨과 각 비트플래인의 데이터를 적절한 순서로 전송하여 전송의 초기에 보다 적은 데이터로 영상의 내용을 대체적으로 파악할 수 있도록 하였다.

• 전자공학회논문지B
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• 제31B권3호
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• pp.69-79
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• 1994

DCT image coding has been well known for its compression efficiency. Its nature makes it also suitable for efficient progressive transmission and reconstruction since low frequency transform coefficients contain most of the energy of image signals. In this paper, we propose a progressive transmission technique of DCT image by non-sequential bit ordering using Lloyd-Max quantizer. And then, we will show that the Lloyd-Max quantizer can be embedded quantization. In simulation results, the proposed method show better subjective picture and MSE of the reconstructed image than the conventional zig-zag scanning transmission of transform coefficients.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 신호처리소사이어티 추계학술대회 논문집
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• pp.263-266
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• 2003

In this paper, we propose a new progressive image transmission system including the image coding scheme that efficiently uses the relationship between the properties of a spatial image and its wavelet transform. Firstly, an original image is decomposed into several layers by the wavelet transform, and simultaneously decomposed into 2"x2" blocks. Each image is classified into two image types according to the standard deviations of its blocks. And then each block is categorized into two regions by different thresholds according to the image types, i.e., significant activity region (SAR) and insignificant activity region (IAR). Simulation results show that the proposed coding method has better performance than the EZW and SPIHT in terms of image quality and transmitted bit-rate. In addition, it can be applied to the applications requiring the progressive image transmission.nsmission.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(4)
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• pp.53-56
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• 2000

In progressive image coding, if object region that have main contents in image are transmitted prior to the remained region, this method will be very useful. In this paper, the progressive image coding based on SPIHT using object region transmission method by priority is proposed. First, an original image is transformed by wavelet. Median filtering is used about wavelet transformed coefficient region for extracting object region. This extracted object region encoded by SPIHT. Then encoded object region are transmitted in advance of the remained region. This method is good to a conventional progressive image coding about entire original image. Experimental results show that the proposed method can be very effectively used for image coding applications such as internet retrieval and database searching system.

• 한국CDE학회논문집
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• 제9권2호
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• pp.122-132
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• 2004

Progressive mesh representation and generation have become one of the most important issues in network-based computer graphics. However, current researches are mostly focused on triangular mesh models. On the other hand, solid models are widely used in industry and are applied to advanced applications such as product design and virtual assembly. Moreover, as the demand to share and transmit these solid models over the network is emerging, the generation and the transmission of progressive solid models depending on specific engineering needs and purpose are essential. In this paper, we present a Cellular Topology-based approach to generating and transmitting progressive solid models from a feature-based solid model for internet-based design and collaboration. The proposed approach introduces a new scheme for storing and transmitting solid models over the network. The Cellular Topology (CT) approach makes it possible to effectively generate progressive solid models and to efficiently transmit the models over the network with compact model size. Thus, an arbitrary solid model SM designed by a set of design features is stored as a much coarser solid model SM/sup 0/ together with a sequence of n detail records that indicate how to incrementally refine SM/sup 0/ exactly back into the original solid model SM = SM/sup 0/.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제5권11호
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• pp.2068-2086
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• 2011

Based on the quincunx sub-sampling grid, the New Interleaved Hierarchical INTerpolation (NIHINT) method is recognized as a superior pyramid data structure for the lossless and progressive coding of natural images. In this paper, we propose a new image interpolation algorithm, Edge Adaptive Hierarchical INTerpolation (EAHINT), for a further reduction in the entropy of interpolation errors. We compute the local variance of the causal context to model the strength of a local edge around a target pixel and then apply three statistical decision rules to classify the local edge into a strong edge, a weak edge, or a medium edge. According to these local edge types, we apply an interpolation method to the target pixel using a one-directional interpolator for a strong edge, a multi-directional adaptive weighting interpolator for a medium edge, or a non-directional static weighting linear interpolator for a weak edge. Experimental results show that the proposed algorithm achieves a better compression bit rate than the NIHINT method for lossless image coding. It is shown that the compression bit rate is much better for images that are rich in directional edges and textures. Our algorithm also shows better rate-distortion performance and visual quality for progressive image transmission.