• The Journal of the Korea Contents Association
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• v.6 no.10
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• pp.143-152
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• 2006

JPEG2000, the standard of still image compression based on wavelet, will be widely used. One of the greatest characteristics of JPEG2000 is to offer ROI(Region-Of-Interest) coding. This is to compress with high quality the region that the user wants better than the other region. JPEG2000 and ROI have different parameters, which are tile size and ROI size, wavelet filter type and ROI shape and its location, codeblock size and number of ROI, number of DWT decomposition level and ROI importance, and number of quality layer and low resolution sub-band importance. In this paper, we shows the correlation of the parameters and ROI coding methods through experiments. This helps an application select the parameters and the methods to meet the application.

• Journal of Aquaculture
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• v.11 no.3
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• pp.327-335
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• 1998

Amplification of brook trout growth hormone cDNA using polymerase chain reactiono (PCR) produced a nucleotide of 1,120 bp which contained the 5'non-coding region (13bp), an open reading frame (ORF) coding a growth hormone polypeptide consisting of 210 amino acids (630 bp), and a 3'non-coding region (477 bp). In open reading frame s signal peptide of 22 amino acid and 2 potential disulfide bond sites deduced by 4 cysteine residues were obser-bed. Brook trout growth hormone has 97.1%, 94.8%, 94.3%, 91.9%, 66.2%, 63.5%, 62.9%, 62.3%, 53.8% and 48.1% amino acid identity with that of Atlantic salmon, chum salmon, rainbow trout, coho salmon, tuna, tilapia, yellow tail, carp, flounder and eel, respectively.

• Journal of KIISE:Software and Applications
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• v.34 no.3
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• pp.275-302
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• 2007

We propose a novel still image compression system which supports a high quality text compression function. The system segments the text from the image and compresses the text with a high quality. The system shows 48:1 high compression ratio using context-based adaptive binary arithmetic coding. The arithmetic coding performs the high compression by the codeblocks in the bitplane. The input of the system consists of a segmentation mode and a ROI(Region Of Interest) mode. In segmentation mode, the input image is segmented into a foreground consisting of text and a background consisting of the remaining region. In ROI mode, the input image is represented by the region of interest window. The high quality text compression function with a high compression ratio shows that the proposed system can be comparable with the JPEG2000 products. This system also uses gray coding to improve the compression ratio.

• Proceedings of the Microbiological Society of Korea Conference
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• 2008.05a
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• pp.76-77
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• 2008

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1996.06a
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• pp.175-180
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• 1996

In this paper, a new image segmentation method based on merging of two low contrast neighbor regions iteratively is proposed. It is suitable for very low bit rate coding. The proposed method reduces efficiently contour information and preserves subjective and objective image quality. It consists of image segmentation using 4-level hierarchical structure based on mathematical morphology and 1-level region merging structure using the contrast difference of two adjacent neighbor regions. For each segmented region of the third level, two adjacent neighbor regions having low contrast difference value in fourth level based on contrast difference value is merged iteratively. It preserves image quality and shows the noticeable reduction of the contour information, so that it can improve the bottleneck problem of segmentation-based coding at very low bit rate.

• Journal of Broadcast Engineering
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• v.7 no.4
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• pp.345-354
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• 2002

In this paper, we introduce a new scanning method for MPEG-4 AVC based Fine Granular Scalable video coding that can significantly improve the subjective picture quality of a decoded scalable video. The proposed scanning method can guarantee the subjectively improved picture qualify of the decoded scalable video by encoding, transmitting and decoding the visually important region most-preferentially. From the simulation results, it has been found that the proposed scanning method can lead the FGS method to achieve significantly improved picture quality, especially on the region of interests.

• Journal of Electrical Engineering and information Science
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• v.3 no.2
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• pp.222-229
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• 1998

In the circumstances we want to deal with, a transmission channel is limited and a global motion can happen by camera movement, and also there exists a region-of-interest(ROI) which is more important than background. So very low bit rate coding algorithm is required and processing of global motion must be considered. Also ROI must be reconstructed with required quality after decoding because of its importance. But the existing methods such as H.261, H.263 can not reconstruct ROIs with high quality because they do not consider the fact that ROIs are more important than background. So a new coding scheme is proposed that describes a method for encoding image sequences distinguishing bits between ROI and background. Experimental results show that the suggested algorithm performs well especially in the circumstances where background changes and the area of ROI is small enough compared with that of background.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.8
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• pp.1722-1732
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• 1997

In this paper, we propose a coding method of remotely sensed satellite image data using region classification and interband correlation. This method classifies each pixel vector consider spectral characteristics. Then we perform the classified intraband VQ to remove spatial (intraband redundancy for a reference band image. To remove interband redundancy effectively, we perform the classified interband prediction for the band images that the high correlation spectrally and perform the classified interband VQ for the remaining band images. Experiments on LANDSAT TM image show that the coding efficiency of the proposed method is better than that of the conventional Gupta's method. Especially, this method removes redundancies effectively for satellite iamge including various geographical objects and for and images that have low interband correlation.

• Journal of the Korean Institute of Telematics and Electronics
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• v.25 no.12
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• pp.1677-1685
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• 1988

In this paper, a new contour coding algorithm is investigated for use in region based image coding. Generally the contour data may be encoded by its chain codes or chain difference codes. But the data compression efficiency is low because of heavy burden for initial absolute coordinates of each chain. To alleviate this problem, the depth first search in graph traversal algorithm, is applied to the chain difference coding method. The proposed coding scheme is shown to be very efficient for contour images obtained by split-merge segmentation. Finally, we can reuce data about 60% in comparison with modified chain difference coding.

• Biomedical Science Letters
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• v.8 no.3
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• pp.189-193
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• 2002

We have identified and analyzed the 5'-coding region of SCN5A gene in Korean genome. Although its sequence has already been reported in western countries it is still important to confirm our own sequence for the establishment of Korean-suitable diagnosis on genetic basis. Total RNAs were obtained from three healthy Korean adult hearts and reversely transcribed. RT products were then subjected to PCR reaction followed by DNA sequencing. Three different sets of SCN5A primers were designed and used for the amplification of 5'-coding region of SCN5A from Korean genome. Amplified sequence was roughly one-10th of the entire SCN5A mRNA in size and its detailed sequence was completely matched up to the previously reported sequence. There was no difference between three heart samples, either. So, SCN5A was concluded as the relatively stable gene comparing to other genes that are involved in long QT syndrome.