The Effect of Wavelet Pair Choice in the Compression of the Satellite Images

진홍성,한동엽 한국지구과학회 2011 한국지구과학회지 Vol.32 No.6

The effect of wavelet pair choice in the compression of the satellite images is studied. There is a trade-off between compression rate and perception quality. The encoding ratio is used to express the compression rate, and Peak Signal-to-Noise Ratio (PSNR) is also used for the perceptional performance. The PSNR and the encoding ratio are not matched well for the images with various wavelet pairs, but the tendency is remarkable. It is hard to find the pattern of PSNR for sampled images. On the other hand, there is a pattern of the variation range of the encoding ratio for each image. The satellite images have larger values of the encoding ratio than those of nature images (close range images). Depending on the wavelet pairs, the PSNR and the encoding ratio vary as much as 13.2 to 21.6% and 16.8 to 45.5%,respectively for each image. For Synthetic Aperture Radar (SAR) images the encoding ratio varies from 16 to 20% while for the nature images it varies more than 40% depending on the choice of wavelet pairs. The choice of wavelet for the compression affects the nature images more than the satellite images. With the indices such as the PSNR and the encoding ratio, the satellite images are less sensitive to the choice of wavelet pairs. A new index, energy concentration ratio (ECR) is proposed to investigate the effect of wavelet choice on the satellite image compression. It also shows that the satellite images are less sensitive than the nature images. Nevertheless, the effect of wavelet choice on the satellite image compression varies at least 10% for all three kinds of indices. However, the important of choice of wavelet pairs cannot be ignored.

중력 포텐셜에서의 웨이브렛 변환 응용

진홍성 여수대학교 2002 論文集 Vol.17 No.-

Designing wavelets for the analysis of gravity potential are studied. The method to use a proper wavelet as a analysis tool is studied for model cases. Multiscale edge detection method is used to find the discontinuity.

A Simple Temperature Dependent Model to Predict the Bloom of Aurelia Aurita Polyps

진홍성,오춘영,최일수,황두진,윤양호,한동엽 한국생물공학회 2014 KSBB Journal Vol.29 No.5

Asexual benthic polyp reproduction plays a majorrole in the jellyfish bloom. Recent studies found that temperatureis the most important factor to regulate the budding rateof the polyps. We established a simple dynamic model tocount the number of polyps depending on the variation oftemperature with two data sets from different places. The populationof polyps was counted through the budding rate andthe number of budding times by Fibonacci sequence. It is assumedthat the budding rate depends on the temperature only. The budding rate of the asexual reproduction shows very sensitiveto the distribution of the seawater temperature. The modelwas tested to the temperature data of Ansan located in thewest sea of Korea. The results indicate that this model can beuseful to predict the blooms of Aurelia aurita polyps, whichmay have considerable influence on the bloom of medusa. Theshape of temperature curve plays a key role in the predictingthe bloom of Aurelia aurita polyps.

A Simple Temperature Dependent Model to Predict the Bloom of Aurelia Aurita Polyps

진홍성,오춘영,최일수,황두진,윤양호,한동엽,Jin, Hong Sung,Oh, Choon Young,Choi, Il Soo,Hwang, Doo Jin,Yoon, Yang Ho,Han, Dong Yeob The Korean Society for Biotechnology and Bioengine 2014 KSBB Journal Vol.4 No.1

Asexual benthic polyp reproduction plays a major role in the jellyfish bloom. Recent studies found that temperature is the most important factor to regulate the budding rate of the polyps. We established a simple dynamic model to count the number of polyps depending on the variation of temperature with two data sets from different places. The population of polyps was counted through the budding rate and the number of budding times by Fibonacci sequence. It is assumed that the budding rate depends on the temperature only. The budding rate of the asexual reproduction shows very sensitive to the distribution of the seawater temperature. The model was tested to the temperature data of Ansan located in the west sea of Korea. The results indicate that this model can be useful to predict the blooms of Aurelia aurita polyps, which may have considerable influence on the bloom of medusa. The shape of temperature curve plays a key role in the predicting the bloom of Aurelia aurita polyps.

Wavelet Pair Noise Removal for Increasing the Classification Accuracy of a Remotely Sensed Image

진홍성,유희영,엄주영,최일수,한동엽 대한원격탐사학회 2009 大韓遠隔探査學會誌 Vol.25 No.3

The noise removal as a preprocessing was tried with various kinds of wavelet pairs. Wavelet transform for 2D images generally uses the same wavelets as basis functions in horizontal and vertical directions. A method with different wavelets was tried for each direction separately, which gives more precise interpretation of the classification. Total 486 pairs of wavelets from nine basis functions were tried to remove image noises. The classification accuracies before and after the noise removal were compared. Although all kinds of wavelet pairs showed the increased accuracies in classification, there were best and worst wavelet pairs depending on the data sets. Wavelet pairs with low energy percentage of LL band showed the high classification accuracy. A pattern was found in the results that very similar vertical accuracy was distributed for each horizontal ones. Since Haar is the shortest length filter, Haar could be a predictor wavelet to find the good wavelet pairs.

Wavelet Compression Experiments of the Remotely Sensed Images for Three Kinds of Wavelet Families

진홍성,한동엽 대한공간정보학회 2009 Spatial Information Research Vol.17 No.4

A method to find the nearly optimal PSNR values for compression was tried to remotely sensed images. There is no rule to find the best wavelet pairs for image processing. The expected wavelet pairs following the suggested algorithm showed the optimal result for various kinds of images. Firstly, the PSNR variations with three wavelet families were analyzed. In many cases the longer wavelet filter shows the higher PSNR value, but the rate is getting less in orthogonal wavelet families. Wavelets with moderate filter length are suggested at the point of computational cost. For biorthogonal families it was hard to predict from the length of filters. Multiresolution wavelet analysis was used up to level 3 with three kinds of wavelet families. Biorthogonal wavelet family showed irregular pattern to get the maximum PSNR values, while orthogonal wavelet families showed regular pattern. In orthogonal wavelet families the nearly optimal wavelet pair can be predicted from the level 1.

원격교육시스템 구축방안에 관한 연구

진홍성 여수대학교 2002 論文集 Vol.17 No.-

Several factors are proposed to construct the distance learning system. Carefully designed model saves time and budget in distance learning program. Controlling the relations among coach, delivery, learner entity, evaluation changes the whole distance learning system.

Dirichlet 문제에 대한 소고

오춘영,진홍성 여수대학교 1999 論文集 Vol.14 No.2

Dirichlet 문제는 경계값을 가진 영역(domain)상에서 조화함수를 찾는 문제이다. 여기에서는 영역을 복소평면C. n-차원 실 평면 Rn과 n-차원 복소평면 Cn상에서 Dirichlet문제의 특성과 예를 알아보고자 한다.

남·북한 중등학교 수학교과서의 기하·해석영역의 비교 연구

진홍성,이식,김삼태 여수대학교 1999 論文集 Vol.14 No.2

Education plays important role in coming to an accommodation and in restoring homogeneity of the korean race after unification. we consider the investigation of mathematics text-books of secondary schools in South and North Korea. In particularly, in this paper, we shall investigate the learning contents and the learning substances and its a distribution diagram in textbooks by falling into two regions, geometry and analysis.

전기분해와 공침법을 이용한 해수중의 납 제거

진홍성(Hong Sung Jin),이재호(Jae Ho Lee) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.2